feat: D24 fact intervals (--as-of) and bin/stack assistant helpers. (#37)

Store valid_from/valid_to on leafs and filter search by calendar day without
overloading D16 source staleness; stack start/start-assistant wires brain + PicoClaw.

AGENTS.md

@@ -48,11 +48,12 @@ bin/postgres/ query.go (read-only YAML)
 bin/git/      import.go (go-git history; Python shim execs it)
 bin/web/      search.go (SearXNG; Python shim execs it)
 bin/reasoner/ bakeoff.go (D18 CPU OpenAI tool-call bake-off)
-internal/     shared Go (brain/rank is cgo-free; facts D16; chats; gitlog; websearch; reasoner; duckstats)
+internal/     shared Go (brain/rank is cgo-free; facts D16; cli flaggy D23; chats; gitlog; websearch; reasoner; duckstats)
 bin/qa/       stats.go (DuckDB quantiles / JSONL count; gcc CGO, not Zig)
 bin/watch/    corpus watcher (used by bin/brain/watch.go)
 bin/tools/    vendored python libs behind bin/* (kblib, yamlout, websearch)
 bin/cgo/      zig zcc zc++ (CGO via zig cc, not gcc)
+bin/stack/    start start-assistant stop status (compose + PicoClaw agent)
 bin/docker-entrypoint  container entrypoint (api: serve|search|watch; index: python)
 compose.yaml  docker composition (root level, not docker/)
 Dockerfile    api (Zig CGO, no Python) + index (Python write)
@@ -88,7 +89,9 @@ bin/facts/audit.go ["self"|"db"|"contradict"]     # 2-source + D16 adjudication
 bin/facts/crm.go [--dry-run]                       # proof person↔company/company↔project (ooCRM × corpus SoT)
 bin/kb/search "query" [--repo X]                  # deprecated wrapper → bin/brain/search.go
 bin/brain/search.go "query" [--root facts|info]   # deduction search → YAML
+bin/brain/search.go "query" --as-of 2025-01-01    # D24 fact intervals
 bin/brain/search.go "query" --no-web              # local graph only
+source <(./bin/cli/complete.go bash)              # flaggy completions (D23)
 eval "$(bin/cgo/zig env)"                         # Zig cc + liblbug (not gcc)
 bin/brain/index.go --rebuild [--with-mail] [--with-facts] [--with-chats]
 bin/brain/add.go --text T --root facts --source "a.md x b.md"  # incremental write
@@ -97,6 +100,10 @@ bin/brain/get.go <id> [--body] [--json]          # Go read; Python bin/kb/get CI
 bin/brain/stats.go [--json]
 bin/brain/eval.go [--json]                       # recall@5; questions in internal/brain/rank
 bin/brain/serve.go                               # HTTP :8630; GET /openapi.json POST /mcp
+bin/stack/start                                  # brain HTTP/MCP (reuse healthy :8630)
+bin/stack/start-assistant                        # + reasoner + PicoClaw agent
+bin/stack/status                                 # YAML health
+bin/stack/stop                                   # compose stop; volumes kept
 bin/markdown/import.go [dir]                      # H2 leafs → YAML; Python bin/md/import fallback
 bin/git/import.go [REPO] [--json] [--limit N]     # go-git history → commit leafs
 bin/web/search.go "query" [--json]                # SearXNG; throttled ≠ absence

PLAN.md

@@ -8,7 +8,9 @@ Status: **v1 in** (epic [#16](https://git.produktor.io/eSlider/2dph/issues/16) c
 v2 board: milestone [v2](https://git.produktor.io/eSlider/2dph/milestone/13) —
 OCR [#6](https://git.produktor.io/eSlider/2dph/issues/6) in,
 [#29](https://git.produktor.io/eSlider/2dph/issues/29) OQ1 in,
-[#30](https://git.produktor.io/eSlider/2dph/issues/30) OQ3 in.
+[#30](https://git.produktor.io/eSlider/2dph/issues/30) OQ3 in,
+[#34](https://git.produktor.io/eSlider/2dph/issues/34) D23 in,
+[#36](https://git.produktor.io/eSlider/2dph/issues/36) OQ5/D24 in.
 Gap: [docs/roadmap.md](docs/roadmap.md).
 
 ## What
@@ -51,6 +53,8 @@ detective method: **a fact needs ≥2 independent sources or it is
 | D20 | agent API | OpenAPI + MCP are generated from the same `internal/httpapi.Ops` table as `bin/brain/serve.go` handlers. `GET /openapi.json`, `POST /mcp` (JSON-RPC tools/list + tools/call). Tool names match OpenAPI paths (`search`/`get`/`stats`/`audit`/`ingest`). |
 | D21 | CGO | Ladybug/tokenizers CGO is compiled with **Zig** (`bin/cgo/zcc` → `zig cc -target …-linux-gnu`), not gcc. `bin/cgo/zig` pins Zig 0.14.1 + liblbug 0.19.1 + libtokenizers 1.27.0. Compose `target: api` has no CPython; write/rebuild is profile `index`. |
 | D22 | analytics | **duckdb-go** in-process (`internal/duckstats`, `bin/qa/stats.go`) for quantiles/JSONL. Links with **gcc/g++**, not Zig. Ladybug stays the graph; web-search cache stays modernc sqlite. Slice small structured docs with **mikefarah/yq**, not kislyuk/jq. [#30](https://git.produktor.io/eSlider/2dph/issues/30). |
+| D23 | CLI | **flaggy** (`github.com/integrii/flaggy`, 0 deps). Flags at any position. Wrapper `internal/cli`. Bash complete: `source <(./bin/cli/complete.go bash)`. No cobra, no stdlib `flag` in Go tools. Search does not intercept the word `completion`. [#34](https://git.produktor.io/eSlider/2dph/issues/34). |
+| D24 | fact intervals | Leaf `valid_from` / `valid_to` (YYYY-MM-DD, inclusive; empty = open/legacy). Search `--as-of` / MCP `as_of` keeps facts active that day. Not D16 `temporal_freshness` (source stale vs HEAD). Empty interval = always visible. [#36](https://git.produktor.io/eSlider/2dph/issues/36). |
 
 ## Architecture
 
@@ -67,7 +71,8 @@ detective method: **a fact needs ≥2 independent sources or it is
     brain/add.go            incremental leaf write (no rebuild)
     brain/get.go stats.go eval.go  # Go read (cgo); Python bin/kb/* CI fallback
     brain/watch.go
-    brain/search.go         deduction: facts → info → web-search
+    brain/search.go         deduction: facts → info → web
+    cli/complete.go         flaggy bash/zsh/fish complete (D23)
     brain/serve.go          HTTP API in-process + OpenAPI/MCP (D20); Zig CGO (D21)
     cgo/zig zcc zc++        CGO toolchain (zig cc, not gcc)
     mail/import.go          JSON → markdown (no brain write)
@@ -80,7 +85,8 @@ detective method: **a fact needs ≥2 independent sources or it is
                             (libs in internal/chats; no chats index)
     mail/ocr.go             tesseract eng+deu (pdftoppm scans)
     md/import               (deprecated; bin/markdown/import.go)
-    brain/extract  brain/audit   brain/deduce    (thinking wrapper)
+    brain/extract  brain/audit       brain/deduce    (thinking wrapper)
+    stack/start start-assistant stop status
     web/search               (deprecated shim → web/search.go)
     db/psql-yq               (vendored)
     ssh-tunnel               onlyoffice pg tunnel 5433
@@ -98,7 +104,8 @@ them from each hit (1=File, 2=Commit, 3=Person). Rebuild writes
 `Leaf-[:FROM_FILE]->File`; git import writes the rest.
 
 Common props on every node/edge: `root`, `confidence`, `evidence[]`, `how`,
-`where`, `when`, `source_rev`.
+`where`, `when`, `source_rev`. Leaf interval of truth (D24): `valid_from`,
+`valid_to`.
 
 ## Config
 
@@ -129,6 +136,8 @@ Common props on every node/edge: `root`, `confidence`, `evidence[]`, `how`,
   quantiles / JSONL count. Not a second graph. [#30](https://git.produktor.io/eSlider/2dph/issues/30).
 - OQ4: YAML-first storage for leafs — deferred: JSON is ~10x faster to
   serialize and unambiguous; YAML only where humans edit files.
+- OQ5: **in** — fact `valid_from` / `valid_to` + `--as-of` / MCP `as_of` (D24).
+  Not D16 `temporal_freshness`. [#36](https://git.produktor.io/eSlider/2dph/issues/36).
 
 ## Mail pipeline (done)
 

README.md

@@ -160,6 +160,10 @@ go test ./... && uv run python -m unittest discover -s bin/tools -t .
 Docker (optional, cached model + var volumes):
 
 ```bash
+bin/stack/start                                # brain HTTP/MCP :8630
+bin/stack/start-assistant                      # + qwen3.5:9b + PicoClaw agent
+bin/stack/status
+bin/stack/stop
 docker compose up -d brain                     # API (Zig CGO serve :8630)
 docker compose --profile index run --rm index  # Python Ladybug rebuild
 docker compose --profile picoclaw up brain-mcp # MCP on 127.0.0.1:8630

bin/cli/complete.go

@@ -0,0 +1,91 @@
+//usr/bin/env go run "$0" "$@"; exit
+//
+// bin/cli/complete.go - dump flaggy shell completions for all Go shebang tools (D23).
+//
+//	source <(./bin/cli/complete.go bash)
+//	./bin/cli/complete.go zsh|fish|powershell|nushell
+//
+// Search does not steal the word "completion"; this binary dumps scripts.
+// NOTE: never run `gofmt -w` on this file — it breaks the shebang.
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	mailsync "github.com/eSlider/2dph/bin/mail/sync"
+	"github.com/eSlider/2dph/internal/brain/rank"
+	"github.com/eSlider/2dph/internal/chats"
+	"github.com/eSlider/2dph/internal/cli"
+	"github.com/eSlider/2dph/internal/gitlog"
+	"github.com/eSlider/2dph/internal/mdleaves"
+	"github.com/eSlider/2dph/internal/ocr"
+	"github.com/eSlider/2dph/internal/reasoner"
+	"github.com/eSlider/2dph/internal/websearch"
+	"github.com/integrii/flaggy"
+)
+
+func tools() []cli.Tool {
+	return []cli.Tool{
+		{Path: "bin/brain/search.go", Name: "brain-search", New: rank.Parser},
+		{Path: "bin/brain/get.go", Name: "brain-get", New: func() *flaggy.Parser {
+			o := rank.GetOptions{}
+			return rank.GetParser(&o)
+		}},
+		{Path: "bin/brain/stats.go", Name: "brain-stats", New: rank.StatsParser},
+		{Path: "bin/brain/eval.go", Name: "brain-eval", New: rank.EvalParser},
+		{Path: "bin/web/search.go", Name: "web-search", New: websearch.Parser},
+		{Path: "bin/git/import.go", Name: "git-import", New: gitlog.Parser},
+		{Path: "bin/markdown/import.go", Name: "markdown-import", New: mdleaves.Parser},
+		{Path: "bin/qa/stats.go", Name: "qa-stats", New: cli.QAParser},
+		{Path: "bin/reasoner/bakeoff.go", Name: "reasoner-bakeoff", New: reasoner.Parser},
+		{Path: "bin/mail/ocr.go", Name: "mail-ocr", New: ocr.Parser},
+		{Path: "bin/mail/sync.go", Name: "mail-sync", New: mailsync.Parser},
+		{Path: "bin/chats/sync.go", Name: "chats-sync", New: chats.SyncParser},
+		{Path: "bin/chats/import.go", Name: "chats-import", New: chats.ImportParser},
+		{Path: "bin/chats/facts.go", Name: "chats-facts", New: chats.FactsParser},
+		{Path: "bin/chats/apply.go", Name: "chats-apply", New: chats.ApplyParser},
+	}
+}
+
+func main() {
+	os.Exit(run(os.Args[1:]))
+}
+
+func run(args []string) int {
+	shell := "bash"
+	if len(args) > 0 {
+		switch args[0] {
+		case "bash", "zsh", "fish", "powershell", "nushell":
+			shell = args[0]
+		case "-h", "--help", "help":
+			fmt.Fprintln(os.Stderr, "usage: bin/cli/complete.go [bash|zsh|fish|powershell|nushell]")
+			return 0
+		default:
+			fmt.Fprintf(os.Stderr, "cli/complete: unknown shell %q\n", args[0])
+			return 2
+		}
+	}
+	if shell == "bash" {
+		fmt.Print(cli.BashScript(tools()))
+		return 0
+	}
+	var b strings.Builder
+	for _, t := range tools() {
+		p := t.New()
+		p.Name = t.Name
+		switch shell {
+		case "zsh":
+			b.WriteString(flaggy.GenerateZshCompletion(p))
+		case "fish":
+			b.WriteString(flaggy.GenerateFishCompletion(p))
+		case "powershell":
+			b.WriteString(flaggy.GeneratePowerShellCompletion(p))
+		case "nushell":
+			b.WriteString(flaggy.GenerateNushellCompletion(p))
+		}
+	}
+	fmt.Print(b.String())
+	return 0
+}

bin/git/import.go

@@ -16,9 +16,8 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
-	"strconv"
-	"time"
 
+	cliparse "github.com/eSlider/2dph/internal/cli"
 	"github.com/eSlider/2dph/internal/cmdbin"
 	"github.com/eSlider/2dph/internal/gitlog"
 )
@@ -28,49 +27,16 @@ func main() {
 }
 
 func run(args []string) int {
-	var repo, root, since string
+	c, err := gitlog.ParseArgs(args)
-	limit := 0
+	if err != nil {
-	jsonOut := false
+		return cliparse.Fail(err)
-	i := 0
-	for i < len(args) {
-		a := args[i]
-		switch {
-		case a == "--json":
-			jsonOut = true
-		case a == "--limit" && i+1 < len(args):
-			i++
-			n, err := strconv.Atoi(args[i])
-			if err != nil || n < 0 {
-				fmt.Fprintf(os.Stderr, "git/import: --limit must be a non-negative integer\n")
-				return 2
-			}
-			limit = n
-		case a == "--since" && i+1 < len(args):
-			i++
-			since = args[i]
-		case a == "--root" && i+1 < len(args):
-			i++
-			root = args[i]
-		case a == "-h" || a == "--help":
-			fmt.Fprintln(os.Stderr, `usage: bin/git/import.go [REPO] [--json] [--limit N] [--since DATE] [--root DIR]`)
-			return 0
-		case len(a) > 0 && a[0] != '-':
-			repo = a
-		default:
-			fmt.Fprintf(os.Stderr, "git/import: unknown flag %s\n", a)
-			return 2
-		}
-		i++
 	}
+	repo, root, since, limit, jsonOut := c.Repo, c.Root, c.Since, c.Limit, c.JSONOut
 
-	var sinceT time.Time
+	sinceT, err := gitlog.ParseSince(since)
-	if since != "" {
+	if err != nil {
-		var err error
+		fmt.Fprintf(os.Stderr, "git/import: %v\n", err)
-		sinceT, err = parseSince(since)
+		return 2
-		if err != nil {
-			fmt.Fprintf(os.Stderr, "git/import: %v\n", err)
-			return 2
-		}
 	}
 
 	repos := []string{}
@@ -132,12 +98,3 @@ func run(args []string) int {
 	}
 	return 0
 }
-
-func parseSince(s string) (time.Time, error) {
-	for _, layout := range []string{time.RFC3339, "2006-01-02"} {
-		if t, err := time.Parse(layout, s); err == nil {
-			return t, nil
-		}
-	}
-	return time.Time{}, fmt.Errorf("cannot parse --since %q", s)
-}

bin/kb/add

@@ -65,6 +65,10 @@ def main(argv: list[str]) -> int:
     p.add_argument("--how", default="brain/add")
     p.add_argument("--loc", default="")
     p.add_argument("--type", default="reference", dest="type_")
+    p.add_argument("--valid-from", default="", dest="valid_from",
+                   help="fact interval start YYYY-MM-DD (D24)")
+    p.add_argument("--valid-to", default="", dest="valid_to",
+                   help="fact interval end YYYY-MM-DD inclusive; empty=open (D24)")
     args = p.parse_args(argv)
 
     if args.json:
@@ -86,6 +90,8 @@ def main(argv: list[str]) -> int:
             "how": args.how,
             "loc": args.loc or args.source,
             "type": args.type_,
+            "valid_from": args.valid_from,
+            "valid_to": args.valid_to,
         }]
 
     for lf in leafs:

bin/mail/ocr.go

@@ -17,6 +17,7 @@ import (
 	"os"
 	"strings"
 
+	cliparse "github.com/eSlider/2dph/internal/cli"
 	"github.com/eSlider/2dph/internal/ocr"
 )
 
@@ -25,15 +26,12 @@ func main() {
 }
 
 func run(args []string) int {
-	if len(args) != 1 || strings.HasPrefix(args[0], "-") {
+	c, err := ocr.ParseArgs(args)
-		fmt.Fprintln(os.Stderr, `usage: bin/mail/ocr.go <image|pdf>`)
+	if err != nil {
-		return 2
+		return cliparse.Fail(err)
 	}
-	path := args[0]
+	path := c.Path
-	var (
+	var text string
-		text string
-		err  error
-	)
 	if strings.HasSuffix(strings.ToLower(path), ".pdf") {
 		text, err = ocr.PDFFile(path)
 	} else {

bin/mail/sync/cli.go

@@ -5,74 +5,103 @@ package sync
 
 import (
 	"context"
-	"flag"
+	"errors"
 	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
 	"time"
+
+	cliparse "github.com/eSlider/2dph/internal/cli"
+	"github.com/integrii/flaggy"
 )
 
 // CLIConfig is a superset of SyncConfig plus flag parsing results.
 type CLIConfig struct {
-	Sync SyncConfig
+	Sync    SyncConfig
-	Env  string // .env path; default <cwd>/.env
+	Env     string // .env path; default <cwd>/.env
 	Sources string
-	Help bool
+	Help    bool
 }
 
-// ParseCLI reads os.Args into a CLIConfig. Exit codes: 0 ok, 2 usage.
+type flagVals struct {
+	env, out, srcs, query string
+	workers, limit, offset int
+	force, dryRun         bool
+}
+
+func Parser() *flaggy.Parser {
+	v := flagVals{workers: 4, query: "in:inbox", srcs: "onlyoffice"}
+	return bind(&v)
+}
+
+func bind(v *flagVals) *flaggy.Parser {
+	if v.workers == 0 {
+		v.workers = 4
+	}
+	if v.query == "" {
+		v.query = "in:inbox"
+	}
+	if v.srcs == "" {
+		v.srcs = "onlyoffice"
+	}
+	p := cliparse.New("mail-sync")
+	p.Description = "download mail to var/mail"
+	p.String(&v.env, "", "env", ".env file")
+	p.String(&v.out, "", "out", "var/mail root")
+	p.Int(&v.workers, "", "workers", "concurrent downloads")
+	p.Int(&v.limit, "", "limit", "max messages per source (0 = all)")
+	p.Int(&v.offset, "", "offset", "skip first N messages per source")
+	p.Bool(&v.force, "", "force", "overwrite existing message.json")
+	p.Bool(&v.dryRun, "", "dry-run", "list counts without writing")
+	p.String(&v.query, "", "query", "Gmail search query")
+	p.String(&v.srcs, "", "source", "comma list: onlyoffice,gmail")
+	return p
+}
+
+// ParseCLI reads args into a CLIConfig. Exit codes: 0 ok, 2 usage.
 func ParseCLI(args []string) (CLIConfig, int, error) {
-	fs := flag.NewFlagSet("mail/sync", flag.ContinueOnError)
+	v := flagVals{workers: 4, query: "in:inbox", srcs: "onlyoffice"}
-	var (
+	p := bind(&v)
-		env    = fs.String("env", "", ".env file (default: <cwd>/.env)")
+	if err := cliparse.Parse(p, args); err != nil {
-		out    = fs.String("out", "", "var/mail root (default: <cwd>/var/mail)")
+		if errors.Is(err, cliparse.ErrHelp) {
-		workers = fs.Int("workers", 4, "concurrent downloads")
+			return CLIConfig{Help: true}, 0, nil
-		limit  = fs.Int("limit", 0, "max messages per source (0 = all)")
+		}
-		offset = fs.Int("offset", 0, "skip first N messages per source")
-		force  = fs.Bool("force", false, "overwrite existing message.json + attachments")
-		dryRun = fs.Bool("dry-run", false, "list message counts without writing")
-		query  = fs.String("query", "in:inbox", "Gmail search query (gmail source only)")
-		srcs   = fs.String("source", "onlyoffice", "comma list: onlyoffice,gmail (default onlyoffice)")
-		help   = fs.Bool("help", false, "usage")
-	)
-	fs.SetOutput(os.Stderr)
-	if err := fs.Parse(args); err != nil {
 		return CLIConfig{}, 2, err
 	}
-	if *help || fs.NArg() > 0 {
+	if len(p.TrailingArguments) > 0 {
 		return CLIConfig{Help: true}, 0, nil
 	}
 	wd, err := os.Getwd()
 	if err != nil {
 		return CLIConfig{}, 2, err
 	}
-	if *env == "" {
+	if v.env == "" {
-		*env = filepath.Join(wd, ".env")
+		v.env = filepath.Join(wd, ".env")
 	}
-	if *out == "" {
+	if v.out == "" {
-		*out = filepath.Join(wd, "var", "mail")
+		v.out = filepath.Join(wd, "var", "mail")
 	}
-	envVars := readEnv(*env)
+	envVars := readEnv(v.env)
 	cfg := SyncConfig{
-		Out:     *out,
+		Out:     v.out,
-		Workers: *workers,
+		Workers: v.workers,
-		Limit:   *limit,
+		Limit:   v.limit,
-		Offset:  *offset,
+		Offset:  v.offset,
-		Force:   *force,
+		Force:   v.force,
-		DryRun:  *dryRun,
+		DryRun:  v.dryRun,
-		Query:   *query,
+		Query:   v.query,
 		Policy:  RetryPolicy{},
 	}
-	cli := CLIConfig{Sync: cfg, Env: *env, Sources: *srcs}
+	out := CLIConfig{Sync: cfg, Env: v.env, Sources: v.srcs}
-	for _, s := range strings.Split(*srcs, ",") {
+	for _, s := range strings.Split(v.srcs, ",") {
 		switch strings.TrimSpace(s) {
 		case "onlyoffice":
 			u := pick(envVars["ONLYOFFICE_URL"], envVars["OO_URL"])
 			user := pick(envVars["ONLYOFFICE_USER"], envVars["OO_USER"])
 			pass := pick(envVars["ONLYOFFICE_PASS"], envVars["OO_PASSWORD"])
 			if u == "" || user == "" || pass == "" {
-				return CLIConfig{}, 2, fmt.Errorf("onlyoffice source needs ONLYOFFICE_URL/USER/PASS in %s", *env)
+				return CLIConfig{}, 2, fmt.Errorf("onlyoffice source needs ONLYOFFICE_URL/USER/PASS in %s", v.env)
 			}
 			cfg.OO = &OOConfig{URL: u, User: user, Password: pass}
 		case "gmail":
@@ -85,30 +114,30 @@ func ParseCLI(args []string) (CLIConfig, int, error) {
 			return CLIConfig{}, 2, fmt.Errorf("unknown source %q", s)
 		}
 	}
-	cli.Sync = cfg
+	out.Sync = cfg
-	return cli, 0, nil
+	return out, 0, nil
 }
 
 // Main is the CLI entry: returns process exit code.
 func Main(args []string) int {
-	cli, code, err := ParseCLI(args)
+	cfg, code, err := ParseCLI(args)
 	if err != nil {
 		fmt.Fprintln(os.Stderr, "mail/sync:", err)
 		return code
 	}
-	if cli.Help {
+	if cfg.Help {
 		fmt.Fprintln(os.Stderr, "usage: bin/mail/sync.go [--source onlyoffice,gmail] [--query GMAIL_Q] [--limit N] [--offset N] [--workers N] [--force] [--dry-run]")
 		return 0
 	}
 	ctx, cancel := context.WithTimeout(context.Background(), 6*time.Hour)
 	defer cancel()
 	start := time.Now()
-	stats, err := Run(ctx, cli.Sync)
+	stats, err := Run(ctx, cfg.Sync)
 	if err != nil {
 		fmt.Fprintln(os.Stderr, "mail/sync:", err)
 		return 1
 	}
-	if cli.Sync.DryRun {
+	if cfg.Sync.DryRun {
 		fmt.Printf("mail/sync: dry-run checked=%d (no writes)\n", stats.Checked)
 		return 0
 	}
@@ -135,7 +164,6 @@ func readEnv(path string) map[string]string {
 		k, v, _ := strings.Cut(line, "=")
 		out[strings.TrimSpace(k)] = strings.Trim(strings.TrimSpace(v), "\"'")
 	}
-	// env overrides file
 	for _, kv := range os.Environ() {
 		k, v, ok := strings.Cut(kv, "=")
 		if !ok {

bin/markdown/import.go

@@ -15,6 +15,7 @@ import (
 	"os"
 	"strings"
 
+	cliparse "github.com/eSlider/2dph/internal/cli"
 	"github.com/eSlider/2dph/internal/mdleaves"
 )
 
@@ -23,29 +24,13 @@ func main() {
 }
 
 func run(args []string) int {
-	jsonOut := false
+	c, err := mdleaves.ParseArgs(args)
-	files := ""
+	if err != nil {
-	root := "."
+		return cliparse.Fail(err)
-	for i := 0; i < len(args); i++ {
-		a := args[i]
-		switch {
-		case a == "--json":
-			jsonOut = true
-		case a == "--files" && i+1 < len(args):
-			i++
-			files = args[i]
-		case strings.HasPrefix(a, "--files="):
-			files = strings.TrimPrefix(a, "--files=")
-		case a == "-h" || a == "--help":
-			fmt.Fprintln(os.Stderr, "bin/markdown/import.go [dir] [--files a.md,b.md] [--json]")
-			return 0
-		case strings.HasPrefix(a, "-"):
-			fmt.Fprintln(os.Stderr, "unknown arg:", a)
-			return 2
-		default:
-			root = a
-		}
 	}
+	jsonOut := c.JSONOut
+	files := c.Files
+	root := c.Root
 
 	var paths []string
 	if files != "" {

bin/qa/stats.go

@@ -16,8 +16,8 @@ import (
 	"fmt"
 	"io"
 	"os"
-	"strings"
 
+	cliparse "github.com/eSlider/2dph/internal/cli"
 	"github.com/eSlider/2dph/internal/duckstats"
 )
 
@@ -26,23 +26,11 @@ func main() {
 }
 
 func run(args []string) int {
-	jsonl := ""
+	c, err := cliparse.ParseQAStats(args)
-	for i := 0; i < len(args); i++ {
+	if err != nil {
-		a := args[i]
+		return cliparse.Fail(err)
-		switch {
-		case a == "--jsonl" && i+1 < len(args):
-			i++
-			jsonl = args[i]
-		case strings.HasPrefix(a, "--jsonl="):
-			jsonl = strings.TrimPrefix(a, "--jsonl=")
-		case a == "-h" || a == "--help":
-			fmt.Fprintln(os.Stderr, "bin/qa/stats.go [--jsonl FILE]  # stdin = JSON [float,…]")
-			return 0
-		default:
-			fmt.Fprintln(os.Stderr, "unknown arg:", a)
-			return 2
-		}
 	}
+	jsonl := c.JSONL
 	if jsonl != "" {
 		n, err := duckstats.CountJSONL(jsonl)
 		if err != nil {

bin/reasoner/bakeoff.go

@@ -15,8 +15,8 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
-	"strings"
 
+	cliparse "github.com/eSlider/2dph/internal/cli"
 	"github.com/eSlider/2dph/internal/duckstats"
 	"github.com/eSlider/2dph/internal/reasoner"
 )
@@ -26,42 +26,13 @@ func main() {
 }
 
 func run(args []string) int {
-	base := os.Getenv("REASONER_BASE_URL")
+	c, err := reasoner.ParseArgs(args)
-	if base == "" {
+	if err != nil {
-		base = "http://127.0.0.1:11435/v1"
+		return cliparse.Fail(err)
 	}
-	model := os.Getenv("REASONER_MODEL")
+	base, model, jsonOut, device := c.Base, c.Model, c.JSONOut, c.Device
-	if model == "" {
+	client := reasoner.Client{BaseURL: base, Model: model, Device: device}
-		model = reasoner.OllamaRAM
+	rep := reasoner.Run(client)
-	}
-	jsonOut := false
-	device := "cpu"
-	for i := 0; i < len(args); i++ {
-		a := args[i]
-		switch {
-		case a == "--json":
-			jsonOut = true
-		case a == "--model" && i+1 < len(args):
-			i++
-			model = args[i]
-		case strings.HasPrefix(a, "--model="):
-			model = strings.TrimPrefix(a, "--model=")
-		case a == "--base-url" && i+1 < len(args):
-			i++
-			base = args[i]
-		case a == "--device" && i+1 < len(args):
-			i++
-			device = args[i]
-		case a == "-h" || a == "--help":
-			fmt.Fprintln(os.Stderr, "bin/reasoner/bakeoff.go [--model ID] [--base-url URL] [--device cpu] [--json]")
-			return 0
-		default:
-			fmt.Fprintln(os.Stderr, "unknown arg:", a)
-			return 2
-		}
-	}
-	c := reasoner.Client{BaseURL: base, Model: model, Device: device}
-	rep := reasoner.Run(c)
 	lat := make([]float64, 0, len(rep.Prompts))
 	for _, p := range rep.Prompts {
 		lat = append(lat, float64(p.LatencyMS))

bin/stack/lib.sh

@@ -0,0 +1,235 @@
+# bin/stack/lib.sh — compose helpers for start / start-assistant / stop / status.
+# Sourced, not executed. No secrets. No host-absolute paths.
+
+BRAIN_URL="${BRAIN_URL:-http://127.0.0.1:8630}"
+REASONER_URL="${REASONER_URL:-http://127.0.0.1:11435}"
+PICOCLAW_URL="${PICOCLAW_URL:-http://127.0.0.1:18790}"
+REASONER_MODEL="${REASONER_MODEL:-qwen3.5:9b}"
+STACK_WAIT_SECS="${STACK_WAIT_SECS:-90}"
+STACK_WAIT_INTERVAL="${STACK_WAIT_INTERVAL:-2}"
+STACK_PULL_SECS="${STACK_PULL_SECS:-600}"
+
+if [[ -z "${ROOT:-}" ]]; then
+	STACK_DIR="$(CDPATH= cd -- "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+	ROOT="$(CDPATH= cd -- "$STACK_DIR/../.." && pwd)"
+fi
+
+stack_usage() {
+	awk 'NR == 1 { next } /^#/ { sub(/^# ?/, ""); print; next } { exit }' "$1"
+}
+
+stack_die() {
+	echo "bin/stack: $*" >&2
+	return 1
+}
+
+compose() {
+	docker compose -f "$ROOT/compose.yaml" --project-directory "$ROOT" "$@"
+}
+
+http_get() {
+	local url=$1
+	local timeout=${2:-5}
+	curl -sS --max-time "$timeout" "$url" 2>/dev/null || return 1
+}
+
+health_ok() {
+	local url=$1
+	local timeout=${2:-5}
+	local body
+	body=$(http_get "$url" "$timeout") || return 1
+	printf '%s' "$body" | grep -q '"status":"ok"'
+}
+
+wait_health() {
+	local url=$1
+	local n=0
+	while ((n <= STACK_WAIT_SECS)); do
+		if health_ok "$url"; then
+			return 0
+		fi
+		n=$((n + 1))
+		if ((n <= STACK_WAIT_SECS)); then
+			sleep "$STACK_WAIT_INTERVAL"
+		fi
+	done
+	return 1
+}
+
+wait_http() {
+	local url=$1
+	local n=0
+	while ((n <= STACK_WAIT_SECS)); do
+		if http_get "$url" 5 >/dev/null; then
+			return 0
+		fi
+		n=$((n + 1))
+		if ((n <= STACK_WAIT_SECS)); then
+			sleep "$STACK_WAIT_INTERVAL"
+		fi
+	done
+	return 1
+}
+
+mcp_body() {
+	curl -sS --max-time 10 \
+		-H 'Content-Type: application/json' \
+		-d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}' \
+		"$BRAIN_URL/mcp" 2>/dev/null || return 1
+}
+
+mcp_ok() {
+	local body
+	body=$(mcp_body) || return 1
+	printf '%s' "$body" | grep -Eq '"name": ?"search"' || return 1
+	printf '%s' "$body" | grep -Eq '"name": ?"get"' || return 1
+	printf '%s' "$body" | grep -Eq '"name": ?"audit"' || return 1
+	return 0
+}
+
+reasoner_tags() {
+	http_get "$REASONER_URL/api/tags" 5
+}
+
+reasoner_has_model() {
+	local body
+	body=$(reasoner_tags) || return 1
+	printf '%s' "$body" | grep -Fq "$REASONER_MODEL"
+}
+
+ensure_mcp() {
+	mcp_ok || stack_die "MCP tools/list missing search/get/audit at $BRAIN_URL/mcp"
+}
+
+ensure_brain() {
+	if health_ok "$BRAIN_URL/health"; then
+		echo "brain: reuse $BRAIN_URL" >&2
+	else
+		echo "brain: compose up" >&2
+		compose up -d brain
+		wait_health "$BRAIN_URL/health" || stack_die "brain health failed at $BRAIN_URL/health"
+	fi
+	ensure_mcp
+}
+
+pull_reasoner_model() {
+	echo "reasoner: pulling $REASONER_MODEL (CPU, may take minutes)" >&2
+	curl -sS --max-time "$STACK_PULL_SECS" \
+		-H 'Content-Type: application/json' \
+		-d "{\"name\":\"$REASONER_MODEL\"}" \
+		"$REASONER_URL/api/pull" >/dev/null
+}
+
+ensure_reasoner() {
+	if reasoner_has_model; then
+		echo "reasoner: reuse $REASONER_URL model $REASONER_MODEL" >&2
+		return 0
+	fi
+	if ! reasoner_tags >/dev/null; then
+		echo "reasoner: compose up" >&2
+		compose --profile reasoner up -d reasoner
+		wait_http "$REASONER_URL/api/tags" || stack_die "reasoner not listening at $REASONER_URL"
+	fi
+	if reasoner_has_model; then
+		return 0
+	fi
+	pull_reasoner_model
+	reasoner_has_model || stack_die "reasoner missing model $REASONER_MODEL"
+}
+
+ensure_picoclaw() {
+	echo "picoclaw: compose up --no-deps (reuse healthy :8630/:11435)" >&2
+	compose --profile picoclaw up -d --no-deps picoclaw
+	wait_health "$PICOCLAW_URL/health" || stack_die "picoclaw health failed at $PICOCLAW_URL/health"
+}
+
+stack_status() {
+	local bh=down mcp=down ph=down present=false
+	health_ok "$BRAIN_URL/health" && bh=ok
+	mcp_ok && mcp=ok
+	reasoner_has_model && present=true
+	health_ok "$PICOCLAW_URL/health" && ph=ok
+	cat <<EOF
+brain:
+  url: $BRAIN_URL
+  health: $bh
+  mcp: $mcp
+reasoner:
+  url: $REASONER_URL
+  model: $REASONER_MODEL
+  present: $present
+picoclaw:
+  url: $PICOCLAW_URL
+  health: $ph
+EOF
+}
+
+stack_start() {
+	ensure_brain
+}
+
+stack_attach_agent() {
+	local opts=()
+	if [[ -t 0 && -t 1 ]]; then
+		opts+=(-it)
+	else
+		opts+=(-T)
+	fi
+	if [[ (! -t 0 || ! -t 1) && $# -eq 0 ]]; then
+		echo "picoclaw: no TTY. Attach with:" >&2
+		echo "  $ROOT/bin/stack/start-assistant" >&2
+		echo "  docker compose --profile picoclaw exec -it picoclaw picoclaw agent" >&2
+		return 0
+	fi
+	echo "picoclaw: agent (search → get → audit before a factual reply)" >&2
+	exec docker compose -f "$ROOT/compose.yaml" --project-directory "$ROOT" \
+		--profile picoclaw exec "${opts[@]}" picoclaw picoclaw agent "$@"
+}
+
+stack_start_assistant() {
+	local attach=1
+	local agent_args=()
+	while (($#)); do
+		case "$1" in
+		-h | --help)
+			stack_usage "$ROOT/bin/stack/start-assistant"
+			return 0
+			;;
+		--no-attach)
+			attach=0
+			shift
+			;;
+		--)
+			shift
+			agent_args+=("$@")
+			break
+			;;
+		*)
+			agent_args+=("$1")
+			shift
+			;;
+		esac
+	done
+	stack_start
+	ensure_reasoner
+	ensure_picoclaw
+	stack_status
+	if ((attach == 0)); then
+		echo "picoclaw: gateway $PICOCLAW_URL (agent not attached)" >&2
+		echo "ask the brain: $ROOT/bin/stack/start-assistant" >&2
+		echo "one-shot: $ROOT/bin/stack/start-assistant -- -m \"search the 2dph brain for LadybugDB\"" >&2
+		return 0
+	fi
+	stack_attach_agent "${agent_args[@]}"
+}
+
+stack_stop() {
+	case "${1:-}" in
+	-h | --help)
+		stack_usage "$ROOT/bin/stack/stop"
+		return 0
+		;;
+	esac
+	echo "stack: stop brain brain-mcp reasoner picoclaw (volumes kept)" >&2
+	compose --profile picoclaw --profile reasoner stop picoclaw brain-mcp reasoner brain
+}

bin/stack/start

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+# bin/stack/start - bring up brain HTTP/MCP and wait until search/get/audit respond.
+#
+#   bin/stack/start
+#   bin/stack/status
+#
+# Reuses a healthy process on :8630 (host serve or compose). Does not start
+# PicoClaw. Does not rebuild Ladybug.
+set -euo pipefail
+
+STACK_DIR="$(CDPATH= cd -- "$(dirname "$0")" && pwd)"
+# shellcheck source=lib.sh
+source "$STACK_DIR/lib.sh"
+case "${1:-}" in
+-h | --help)
+	stack_usage "$0"
+	exit 0
+	;;
+esac
+stack_start "$@"
+stack_status

bin/stack/start-assistant

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+# bin/stack/start-assistant - start + CPU reasoner + PicoClaw, then attach agent.
+#
+#   bin/stack/start-assistant
+#   bin/stack/start-assistant --no-attach
+#   bin/stack/start-assistant -- -m "search the 2dph brain for LadybugDB"
+#
+# Pulls qwen3.5:9b if missing. Gateway :18790. Agent uses MCP search → get → audit.
+# --no-attach leaves the gateway up without exec.
+set -euo pipefail
+
+STACK_DIR="$(CDPATH= cd -- "$(dirname "$0")" && pwd)"
+# shellcheck source=lib.sh
+source "$STACK_DIR/lib.sh"
+stack_start_assistant "$@"

bin/stack/status

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+# bin/stack/status - YAML health for brain MCP, reasoner model, PicoClaw gateway.
+#
+#   bin/stack/status
+#   bin/stack/status | yq '.picoclaw'
+set -euo pipefail
+
+STACK_DIR="$(CDPATH= cd -- "$(dirname "$0")" && pwd)"
+# shellcheck source=lib.sh
+source "$STACK_DIR/lib.sh"
+case "${1:-}" in
+-h | --help)
+	stack_usage "$0"
+	exit 0
+	;;
+esac
+stack_status

bin/stack/stop

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+# bin/stack/stop - stop compose brain / brain-mcp / reasoner / picoclaw.
+#
+#   bin/stack/stop
+#
+# Volumes kept (kb, reasoner weights, picoclaw-home). Does not kill a host
+# bin/brain/serve.go that is not a compose service.
+set -euo pipefail
+
+STACK_DIR="$(CDPATH= cd -- "$(dirname "$0")" && pwd)"
+# shellcheck source=lib.sh
+source "$STACK_DIR/lib.sh"
+stack_stop "$@"

bin/tools/kblib.py

@@ -62,7 +62,9 @@ def init_schema(conn: ladybug.Connection) -> None:
         "CREATE NODE TABLE IF NOT EXISTS Leaf ("
         " id STRING, text STRING, root STRING, confidence STRING, "
         " sha256 STRING, source STRING, source_rev STRING, observed_at STRING, "
-        " how STRING, loc STRING, type STRING, embedding FLOAT[256], "
+        " how STRING, loc STRING, type STRING, "
+        " valid_from STRING, valid_to STRING, "
+        " embedding FLOAT[256], "
         " PRIMARY KEY(id))"
     )
     conn.execute(
@@ -91,6 +93,46 @@ def init_schema(conn: ladybug.Connection) -> None:
     conn.execute(
         "CREATE REL TABLE IF NOT EXISTS AUTHORED (FROM Commit TO Person)"
     )
+    ensure_interval_columns(conn)
+
+
+def ensure_interval_columns(conn: ladybug.Connection) -> None:
+    """D24: add valid_from/valid_to on older Leaf tables (idempotent ALTER)."""
+    for col in ("valid_from", "valid_to"):
+        try:
+            conn.execute(f"ALTER TABLE Leaf ADD {col} STRING")
+        except Exception:
+            pass
+
+
+def normalize_day(s: str) -> str:
+    s = (s or "").strip()
+    if len(s) >= 10 and s[4] == "-" and s[7] == "-":
+        return s[:10]
+    return s
+
+
+def active_at(valid_from: str, valid_to: str, as_of: str) -> bool:
+    """D24: fact interval of truth. Empty ends = always; empty as_of = no filter."""
+    as_of = normalize_day(as_of)
+    if not as_of:
+        return True
+    fro = normalize_day(valid_from)
+    to = normalize_day(valid_to)
+    if fro and as_of < fro:
+        return False
+    if to and as_of > to:
+        return False
+    return True
+
+
+def filter_as_of(hits: list[dict], as_of: str) -> list[dict]:
+    if not as_of:
+        return hits
+    return [
+        h for h in hits
+        if active_at(str(h.get("valid_from") or ""), str(h.get("valid_to") or ""), as_of)
+    ]
 
 
 def leaf_id(text: str, source: str) -> str:
@@ -99,19 +141,24 @@ def leaf_id(text: str, source: str) -> str:
 
 def upsert_leaf(conn: ladybug.Connection, *, text: str, root: str, confidence: str,
                 source: str, source_rev: str, how: str, loc: str, type_: str,
-                embedding: list[float] | None) -> str:
+                embedding: list[float] | None,
+                valid_from: str = "", valid_to: str = "") -> str:
     lid = leaf_id(text, source)
     obs = time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime())
+    vf = normalize_day(valid_from)
+    vt = normalize_day(valid_to)
     conn.execute(
         "MERGE (l:Leaf {id:$id}) "
         "SET l.text=$text, l.root=$root, l.confidence=$confidence, "
         "    l.sha256=$sha, l.source=$source, l.source_rev=$rev, l.observed_at=$obs, "
-        "    l.how=$how, l.loc=$location, l.type=$type"
+        "    l.how=$how, l.loc=$location, l.type=$type, "
+        "    l.valid_from=$vf, l.valid_to=$vt"
         + (", l.embedding=$emb" if embedding else ""),
         parameters={
             "id": lid, "text": text, "root": root, "confidence": confidence,
             "sha": sha256_b64(text), "source": source, "rev": source_rev,
             "obs": obs, "how": how, "location": loc, "type": type_,
+            "vf": vf, "vt": vt,
             "emb": (embedding if embedding else None),
         },
     )
@@ -121,9 +168,10 @@ def upsert_leaf(conn: ladybug.Connection, *, text: str, root: str, confidence: s
 def add_leafs(conn: ladybug.Connection, leafs: list[dict]) -> list[str]:
     """Write facts+info leafs in one transaction. Safe while FTS/HNSW exist.
 
-    Each leaf dict: text, source, optional root/confidence/source_rev/how/loc/type/embedding.
+    Each leaf dict: text, source, optional root/confidence/source_rev/how/loc/type/
-    Does not delete the database file. Measured on Ladybug 0.19: MERGE of new
+    embedding/valid_from/valid_to. Does not delete the database file. Measured on
-    ids (and updates) stays FTS+HNSW queryable; DROP INDEX is the fatal path.
+    Ladybug 0.19: MERGE of new ids (and updates) stays FTS+HNSW queryable; DROP
+    INDEX is the fatal path.
     """
     if not leafs:
         return []
@@ -148,6 +196,8 @@ def add_leafs(conn: ladybug.Connection, leafs: list[dict]) -> list[str]:
                     loc=str(lf.get("loc") or lf.get("source") or ""),
                     type_=str(lf.get("type") or lf.get("type_") or "reference"),
                     embedding=lf.get("embedding"),
+                    valid_from=str(lf.get("valid_from") or ""),
+                    valid_to=str(lf.get("valid_to") or ""),
                 )
             )
         if started:
@@ -285,29 +335,39 @@ def drop_indexes(conn: ladybug.Connection) -> None:
 def query_fts(conn: ladybug.Connection, text: str, limit: int = 10) -> list[dict]:
     r = conn.execute(
         "CALL QUERY_FTS_INDEX('Leaf', 'id', $q) "
-        "RETURN node.id, node.text, node.root, score ORDER BY score DESC LIMIT $n",
+        "RETURN node.id, node.text, node.root, score, node.valid_from, node.valid_to "
+        "ORDER BY score DESC LIMIT $n",
         parameters={"q": text, "n": limit},
     )
-    return [{"id": row[0], "text": row[1], "root": row[2], "score": row[3]} for row in r.get_all()]
+    return [
+        {
+            "id": row[0], "text": row[1], "root": row[2], "score": row[3],
+            "valid_from": row[4] or "", "valid_to": row[5] or "",
+        }
+        for row in r.get_all()
+    ]
 
 
 def query_vector(conn: ladybug.Connection, embedding: list[float], limit: int = 10) -> list[dict]:
     r = conn.execute(
         "CALL QUERY_VECTOR_INDEX('Leaf', 'Leaf_vec', $q, $n) "
-        "RETURN node.id, node.text, node.root, distance ORDER BY distance LIMIT $n",
+        "RETURN node.id, node.text, node.root, distance, node.valid_from, node.valid_to "
+        "ORDER BY distance LIMIT $n",
         parameters={"q": embedding, "n": limit},
     )
     out = []
     for row in r.get_all():
-        # distance -> similarity reasonable for cosine
         score = 1.0 - row[3] if row[3] is not None else 0.0
-        out.append({"id": row[0], "text": row[1], "root": row[2], "score": score})
+        out.append({
+            "id": row[0], "text": row[1], "root": row[2], "score": score,
+            "valid_from": row[4] or "", "valid_to": row[5] or "",
+        })
     return out
 
 
 def hybrid_search(conn: ladybug.Connection, embedding: list[float], fts_hits: list[dict],
-                  limit: int = 10) -> list[dict]:
+                  limit: int = 10, as_of: str = "") -> list[dict]:
-    """Merge FTS + vector by reciprocal rank fusion."""
+    """Merge FTS + vector by reciprocal rank fusion; optional D24 as-of filter."""
     fused: dict[str, dict] = {}
     for rank, hit in enumerate(fts_hits):
         fused.setdefault(hit["id"], {**hit, "rrf": 0.0})["rrf"] = 1.0 / (60 + rank + 1)
@@ -315,8 +375,10 @@ def hybrid_search(conn: ladybug.Connection, embedding: list[float], fts_hits: li
         entry = fused.setdefault(hit["id"], {**hit, "rrf": 0.0})
         entry["rrf"] += 1.0 / (60 + rank + 1)
         entry.setdefault("score", hit.get("score", 0.0))
+        entry.setdefault("valid_from", hit.get("valid_from") or "")
+        entry.setdefault("valid_to", hit.get("valid_to") or "")
     ranked = sorted(fused.values(), key=lambda h: h.get("rrf", 0.0), reverse=True)
-    return ranked[:limit]
+    return filter_as_of(ranked, as_of)[:limit]
 
 
 def stats(conn: ladybug.Connection) -> dict:

bin/tools/test_bin_layout.py

@@ -143,6 +143,22 @@ class BinLayoutTest(unittest.TestCase):
         shebang = (ROOT / "bin" / "facts" / "audit.go").read_text()
         self.assertIn("contradict", shebang)
 
+    def test_d23_flaggy_cli(self) -> None:
+        self.assertTrue((ROOT / "internal" / "cli" / "cli.go").is_file())
+        self.assertIn("github.com/integrii/flaggy", (ROOT / "go.mod").read_text())
+        plan = (ROOT / "PLAN.md").read_text()
+        self.assertIn("D23", plan)
+        self.assertIn("flaggy", plan)
+        complete = (ROOT / "bin" / "cli" / "complete.go").read_text()
+        first = complete.splitlines()[0]
+        self.assertTrue(first.startswith("//usr/bin/env go run"), first)
+        self.assertIn("complete.go bash", complete)
+        self.assertIn("brain-search", complete)
+        chats_import = (ROOT / "internal" / "chats" / "import.go").read_text()
+        self.assertNotIn("flag.NewFlagSet", chats_import)
+        args = (ROOT / "internal" / "brain" / "rank" / "args.go").read_text()
+        self.assertIn("internal/cli", args)
+
     def test_mail_import_is_shebang_not_brain_write(self) -> None:
         self._assert_shebang("bin/mail/import.go")
         index_mail = (ROOT / "bin" / "mail" / "index_mail").read_text()

bin/tools/test_kblib.py

@@ -194,6 +194,38 @@ class KblibTest(unittest.TestCase):
         self.assertEqual(person["name"], "Ada Lovelace")
         self.assertEqual(person["depth"], 3)
 
+    def test_as_of_keeps_x_drops_y(self) -> None:
+        """OQ5/#36: as of 2025-01-01 → works-at-X, not works-at-Y."""
+        kblib.upsert_leaf(
+            self.conn, text="Andrey works at X", root="facts",
+            confidence="confirmed", source="crm.md x contract.md",
+            source_rev="r1", how="test", loc="/tmp", type_="fact",
+            embedding=make_emb(0.5),
+            valid_from="2024-03-01", valid_to="2025-07-15",
+        )
+        kblib.upsert_leaf(
+            self.conn, text="Andrey works at Y", root="facts",
+            confidence="confirmed", source="offer.md x payroll.md",
+            source_rev="r1", how="test", loc="/tmp", type_="fact",
+            embedding=make_emb(0.6),
+            valid_from="2025-07-16", valid_to="",
+        )
+        kblib.ensure_indexes(self.conn)
+        hits = kblib.query_fts(self.conn, "Andrey works", 10)
+        kept = kblib.filter_as_of(hits, "2025-01-01")
+        texts = [h["text"] for h in kept]
+        self.assertTrue(any("works at X" in t for t in texts), texts)
+        self.assertFalse(any("works at Y" in t for t in texts), texts)
+        later = kblib.filter_as_of(hits, "2025-08-01")
+        later_texts = [h["text"] for h in later]
+        self.assertTrue(any("works at Y" in t for t in later_texts), later_texts)
+        self.assertFalse(any("works at X" in t for t in later_texts), later_texts)
+
+    def test_active_at_pure(self) -> None:
+        self.assertTrue(kblib.active_at("2024-03-01", "2025-07-15", "2025-01-01"))
+        self.assertFalse(kblib.active_at("2025-07-16", "", "2025-01-01"))
+        self.assertTrue(kblib.active_at("", "", "2025-01-01"))
+
 
 if __name__ == "__main__":
     unittest.main()

bin/tools/test_published_docs.py

@@ -186,3 +186,21 @@ class PublishedDocsTest(unittest.TestCase):
         self.assertIn("epic #16", index)
         agents = (ROOT / "AGENTS.md").read_text()
         self.assertIn("roadmap.md", agents)
+
+    def test_oq5_intervals_are_not_d16_stale(self) -> None:
+        plan = (ROOT / "PLAN.md").read_text()
+        design = (ROOT / "docs" / "design.md").read_text()
+        road = (ROOT / "docs" / "roadmap.md").read_text()
+        contradict = (ROOT / "internal" / "facts" / "contradict.go").read_text()
+        interval = (ROOT / "internal" / "facts" / "interval.go").read_text()
+        self.assertIn("OQ5", plan)
+        self.assertIn("D24", plan)
+        self.assertIn("issues/36", plan)
+        self.assertIn("valid_from", plan)
+        self.assertIn("--as-of", design)
+        self.assertIn("issues/36", road)
+        self.assertIn("**in**", road[road.index("OQ5"):road.index("OQ5") + 80])
+        self.assertIn("temporal_freshness", contradict)
+        self.assertNotIn("valid_from", contradict)
+        self.assertIn("ActiveAt", interval)
+        self.assertIn("NormalizeDay", interval)

bin/tools/test_stack.py

@@ -0,0 +1,213 @@
+"""bin/stack/{start,start-assistant,stop,status} — offline contract + fake PATH."""
+from __future__ import annotations
+
+import os
+import stat
+import subprocess
+import tempfile
+import unittest
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+METHODS = ("start", "start-assistant", "stop", "status")
+
+
+class StackLayoutTest(unittest.TestCase):
+    def test_methods_are_bash_with_usage_comment(self) -> None:
+        lib = ROOT / "bin" / "stack" / "lib.sh"
+        self.assertTrue(lib.is_file(), "missing bin/stack/lib.sh")
+        for name in METHODS:
+            p = ROOT / "bin" / "stack" / name
+            self.assertTrue(p.is_file(), f"missing bin/stack/{name}")
+            self.assertTrue(os.access(p, os.X_OK), f"bin/stack/{name} must be executable")
+            lines = p.read_text().splitlines()
+            self.assertEqual(lines[0], "#!/usr/bin/env bash", name)
+            self.assertTrue(lines[1].startswith("# bin/stack/"), name)
+            text = "\n".join(lines)
+            self.assertIn("lib.sh", text, name)
+            self.assertNotIn("/mnt/", text, name)
+            self.assertNotIn("/home/", text, name)
+
+    def test_lib_has_no_host_paths_or_secrets(self) -> None:
+        lib = (ROOT / "bin" / "stack" / "lib.sh").read_text()
+        self.assertIn("stack_start", lib)
+        self.assertIn("stack_start_assistant", lib)
+        self.assertIn("stack_stop", lib)
+        self.assertIn("stack_status", lib)
+        self.assertIn("qwen3.5:9b", lib)
+        self.assertIn("picoclaw agent", lib)
+        self.assertIn("--no-deps", lib)
+        self.assertIn("tools/list", lib)
+        self.assertNotIn("/mnt/", lib)
+        self.assertNotIn("/home/", lib)
+        self.assertNotIn("password", lib.lower())
+        self.assertNotIn("GITEA_TOKEN", lib)
+
+    def test_start_does_not_launch_picoclaw(self) -> None:
+        start = (ROOT / "bin" / "stack" / "start").read_text()
+        self.assertIn("stack_start", start)
+        self.assertNotIn("stack_start_assistant", start)
+        self.assertNotIn("picoclaw agent", start)
+
+    def test_start_assistant_attaches_agent(self) -> None:
+        src = (ROOT / "bin" / "stack" / "start-assistant").read_text()
+        self.assertIn("stack_start_assistant", src)
+        self.assertIn("--no-attach", src)
+
+    def test_stop_does_not_down_volumes(self) -> None:
+        lib = (ROOT / "bin" / "stack" / "lib.sh").read_text()
+        self.assertIn(" compose ", lib)
+        self.assertRegex(lib, r"\bstop\b")
+        self.assertNotIn(" compose down", lib)
+        self.assertNotIn("compose down", lib)
+
+    def test_docs_name_stack_commands(self) -> None:
+        runbook = (ROOT / "docs" / "runbook.md").read_text()
+        pico = (ROOT / "docs" / "picoclaw.md").read_text()
+        agents = (ROOT / "AGENTS.md").read_text()
+        for text in (runbook, pico, agents):
+            self.assertIn("bin/stack/start", text)
+            self.assertIn("bin/stack/start-assistant", text)
+            self.assertIn("bin/stack/status", text)
+            self.assertIn("bin/stack/stop", text)
+
+
+    def test_help_prints_comments_not_source(self) -> None:
+        r = subprocess.run(
+            [str(ROOT / "bin" / "stack" / "start"), "--help"],
+            cwd=str(ROOT),
+            capture_output=True,
+            text=True,
+            check=False,
+        )
+        self.assertEqual(r.returncode, 0, r.stderr)
+        self.assertIn("bin/stack/start", r.stdout)
+        self.assertNotIn("set -euo pipefail", r.stdout)
+        self.assertNotIn("source ", r.stdout)
+
+
+class StackFakePathTest(unittest.TestCase):
+    def _fake_bin(self, tmp: Path, *, health_ok: bool) -> Path:
+        bindir = tmp / "bin"
+        bindir.mkdir()
+        curl = bindir / "curl"
+        docker = bindir / "docker"
+        log = tmp / "docker.log"
+        curl.write_text(
+            f"""#!/usr/bin/env bash
+url=""
+for a in "$@"; do
+  case "$a" in http*) url=$a ;;
+  esac
+done
+if [ "{int(health_ok)}" = "0" ] && [[ "$url" == */health ]]; then
+  echo '{{"status":"down"}}'
+  exit 7
+fi
+case "$url" in
+  */mcp)
+    echo '{{"jsonrpc":"2.0","id":1,"result":{{"tools":[{{"name":"search"}},{{"name":"get"}},{{"name":"audit"}}]}}}}'
+    ;;
+  */api/tags)
+    echo '{{"models":[{{"name":"qwen3.5:9b"}}]}}'
+    ;;
+  */api/pull)
+    echo '{{"status":"success"}}'
+    ;;
+  *)
+    echo '{{"status":"ok"}}'
+    ;;
+esac
+"""
+        )
+        docker.write_text(
+            f"""#!/usr/bin/env bash
+echo "$*" >> "{log}"
+exit 0
+"""
+        )
+        curl.chmod(curl.stat().st_mode | stat.S_IEXEC)
+        docker.chmod(docker.stat().st_mode | stat.S_IEXEC)
+        return bindir
+
+    def _env(self, bindir: Path) -> dict[str, str]:
+        env = os.environ.copy()
+        env["PATH"] = f"{bindir}:{env.get('PATH', '')}"
+        env["STACK_WAIT_SECS"] = "1"
+        env["STACK_WAIT_INTERVAL"] = "0"
+        return env
+
+    def test_start_skips_compose_when_brain_healthy(self) -> None:
+        with tempfile.TemporaryDirectory() as raw:
+            tmp = Path(raw)
+            bindir = self._fake_bin(tmp, health_ok=True)
+            log = tmp / "docker.log"
+            r = subprocess.run(
+                [str(ROOT / "bin" / "stack" / "start")],
+                cwd=str(ROOT),
+                env=self._env(bindir),
+                capture_output=True,
+                text=True,
+                check=False,
+            )
+            self.assertEqual(r.returncode, 0, r.stderr)
+            self.assertFalse(log.exists(), "healthy brain must not docker compose up")
+
+    def test_start_ups_brain_when_unhealthy(self) -> None:
+        with tempfile.TemporaryDirectory() as raw:
+            tmp = Path(raw)
+            bindir = self._fake_bin(tmp, health_ok=False)
+            log = tmp / "docker.log"
+            r = subprocess.run(
+                [str(ROOT / "bin" / "stack" / "start")],
+                cwd=str(ROOT),
+                env=self._env(bindir),
+                capture_output=True,
+                text=True,
+                check=False,
+            )
+            self.assertNotEqual(r.returncode, 0, "unhealthy brain without recovering compose must fail")
+            self.assertTrue(log.exists(), r.stderr)
+            logged = log.read_text()
+            self.assertIn("up -d", logged)
+            self.assertIn("brain", logged)
+            self.assertNotIn("picoclaw", logged)
+
+    def test_stop_stops_named_services(self) -> None:
+        with tempfile.TemporaryDirectory() as raw:
+            tmp = Path(raw)
+            bindir = self._fake_bin(tmp, health_ok=True)
+            log = tmp / "docker.log"
+            r = subprocess.run(
+                [str(ROOT / "bin" / "stack" / "stop")],
+                cwd=str(ROOT),
+                env=self._env(bindir),
+                capture_output=True,
+                text=True,
+                check=False,
+            )
+            self.assertEqual(r.returncode, 0, r.stderr)
+            logged = log.read_text()
+            self.assertIn("stop", logged)
+            self.assertNotIn(" down", logged)
+            for svc in ("brain", "brain-mcp", "reasoner", "picoclaw"):
+                self.assertIn(svc, logged)
+
+    def test_start_assistant_no_attach_starts_picoclaw(self) -> None:
+        with tempfile.TemporaryDirectory() as raw:
+            tmp = Path(raw)
+            bindir = self._fake_bin(tmp, health_ok=True)
+            log = tmp / "docker.log"
+            r = subprocess.run(
+                [str(ROOT / "bin" / "stack" / "start-assistant"), "--no-attach"],
+                cwd=str(ROOT),
+                env=self._env(bindir),
+                capture_output=True,
+                text=True,
+                check=False,
+            )
+            self.assertEqual(r.returncode, 0, r.stderr + r.stdout)
+            logged = log.read_text() if log.exists() else ""
+            self.assertIn("picoclaw", logged)
+            self.assertIn("--no-deps", logged)
+            self.assertNotIn("picoclaw agent", logged)

bin/web/search.go

@@ -16,9 +16,9 @@ import (
 	"fmt"
 	"net/http"
 	"os"
-	"strconv"
 	"time"
 
+	"github.com/eSlider/2dph/internal/cli"
 	"github.com/eSlider/2dph/internal/websearch"
 	"golang.org/x/sys/unix"
 )
@@ -28,77 +28,15 @@ func main() {
 }
 
 func run(args []string) int {
-	var (
+	c, err := websearch.ParseArgs(args)
-		query, site, lang, fresh, category, engines string
+	if err != nil {
-		limit                                       = websearch.DefaultLimit
+		return cli.Fail(err)
-		jsonOut, refresh, force                     bool
-		ttl                                         = float64(websearch.CacheTTL)
-		timeout                                     = 25
-	)
-	i := 0
-	for i < len(args) {
-		a := args[i]
-		switch {
-		case a == "--json":
-			jsonOut = true
-		case a == "--refresh":
-			refresh = true
-		case a == "--force":
-			force = true
-		case (a == "-n" || a == "--limit") && i+1 < len(args):
-			i++
-			n, err := strconv.Atoi(args[i])
-			if err != nil || n < 0 {
-				fmt.Fprintln(os.Stderr, "web/search: --limit must be a non-negative integer")
-				return 2
-			}
-			limit = n
-		case a == "--site" && i+1 < len(args):
-			i++
-			site = args[i]
-		case a == "--lang" && i+1 < len(args):
-			i++
-			lang = args[i]
-		case a == "--fresh" && i+1 < len(args):
-			i++
-			fresh = args[i]
-		case a == "--category" && i+1 < len(args):
-			i++
-			category = args[i]
-		case a == "--engines" && i+1 < len(args):
-			i++
-			engines = args[i]
-		case a == "--ttl" && i+1 < len(args):
-			i++
-			v, err := strconv.ParseFloat(args[i], 64)
-			if err != nil {
-				fmt.Fprintln(os.Stderr, "web/search: --ttl must be a number")
-				return 2
-			}
-			ttl = v
-		case a == "--timeout" && i+1 < len(args):
-			i++
-			n, err := strconv.Atoi(args[i])
-			if err != nil || n <= 0 {
-				fmt.Fprintln(os.Stderr, "web/search: --timeout must be a positive integer")
-				return 2
-			}
-			timeout = n
-		case a == "-h" || a == "--help":
-			fmt.Fprintln(os.Stderr, `usage: bin/web/search.go QUERY [--json] [-n N] [--site HOST] [--lang LANG] [--fresh day|week|month|year] [--category CAT] [--engines LIST] [--refresh] [--force]`)
-			return 0
-		case len(a) > 0 && a[0] != '-' && query == "":
-			query = a
-		default:
-			fmt.Fprintf(os.Stderr, "web/search: unknown flag %s\n", a)
-			return 2
-		}
-		i++
-	}
-	if query == "" {
-		fmt.Fprintln(os.Stderr, "web/search: query required")
-		return 2
 	}
+	query, site, lang, fresh, category, engines := c.Query, c.Site, c.Lang, c.Fresh, c.Category, c.Engines
+	limit := c.Limit
+	jsonOut, refresh, force := c.JSONOut, c.Refresh, c.Force
+	ttl := c.TTL
+	timeout := c.Timeout
 	if site != "" {
 		query = "site:" + site + " " + query
 	}

compose.yaml

@@ -1,5 +1,6 @@
 # 2dph — docker composition
 #
+#   bin/stack/start / start-assistant / status / stop
 #   docker compose up -d brain                  # API (Zig CGO serve)
 #   docker compose --profile index run --rm index   # Python rebuild
 #   docker compose --profile picoclaw up -d     # brain-mcp + CPU reasoner + PicoClaw gateway

docs/README.md

@@ -18,9 +18,9 @@ Evidence-first knowledge graph. Facts need proof or they are
 | tutorial / howto | [runbook](runbook.md) — run anywhere (uv, Go, Docker) |
 | explanation | [design](design.md) — two roots, deduction, D17/D20/D18 |
 | explanation | [roadmap](roadmap.md) — gap to v1 (epic #16) |
-| howto | [picoclaw](picoclaw.md) — MCP agent profile |
+| howto | [picoclaw](picoclaw.md) — MCP agent (`bin/stack/start-assistant`) |
 | howto | [reasoner](reasoner.md) — CPU bake-off (D18) |
-| reference | [PLAN.md](../PLAN.md) — decisions D1–D22 |
+| reference | [PLAN.md](../PLAN.md) — decisions D1–D24 |
 
 Decisions the public face must name: **D3** SearXNG compose, **D6** Go service /
 Python write sidecar, **D14** `bin/{subject}/{method}.go`, **D15** Gitea origin,

docs/design.md

@@ -38,6 +38,10 @@ bin/brain/search.go "question"
 from each hit (1=File, 2=Commit, 3=Person). Rebuild writes FROM_FILE;
 git import writes HAS_VERSION/AUTHORED ([#17](https://git.produktor.io/eSlider/2dph/issues/17)).
 
+Go CLIs parse with **flaggy** via `internal/cli` (D23). Flags may appear
+after positionals (`search q --hop 1`). Completions:
+`source <(./bin/cli/complete.go bash)`.
+
 ## Who / What / How / Where / When + evidence
 
 Every assertion edge carries:
@@ -64,6 +68,15 @@ binary); conversion prints leafs, brain write is `bin/brain/index.go`.
 `bin/facts/audit stale` flags leafs whose observed revision is behind the
 corpus HEAD.
 
+Fact **interval of truth** (D24 / OQ5): leaf props `valid_from` /
+`valid_to` (YYYY-MM-DD, inclusive; empty end = open; both empty = legacy
+always-active). `bin/brain/search.go --as-of YYYY-MM-DD` and MCP/HTTP
+`as_of` keep hits whose interval covers that day. This is not D16
+`temporal_freshness` (source freshness vs HEAD). [#36](https://git.produktor.io/eSlider/2dph/issues/36).
+Existing `kb.lbug` without the columns: open/search/add runs an idempotent
+`ALTER TABLE Leaf ADD …` (no full rebuild required). Fresh `--rebuild` still
+creates them in `CREATE NODE TABLE`.
+
 ## Sources (auto-pairing)
 
 - A: runtime state — `docker ps` (container running), ports actually bound

docs/picoclaw.md

@@ -6,6 +6,18 @@ CPU reasoner. Default agent model is `qwen3.5:9b` (RAM path, D18). Weights stay
 in the reasoner volume, not in the 2dph image.
 No secrets in git: Ollama needs no key; MCP is local HTTP.
 
+```bash
+bin/stack/start-assistant
+bin/stack/start-assistant --no-attach
+bin/stack/start-assistant -- -m "search the 2dph brain for LadybugDB"
+bin/stack/status
+bin/stack/stop
+```
+
+`start-assistant` reuses a healthy brain on `:8630`, starts the CPU reasoner,
+pulls `qwen3.5:9b` if missing, brings up the gateway with `--no-deps picoclaw`,
+then `picoclaw agent` (MCP `search` → `get` → `audit`). Gateway-only Compose:
+
 ```bash
 docker compose --profile picoclaw up -d
 # already serving :8630 / :11435:

docs/roadmap.md

@@ -40,10 +40,13 @@ Epic [#16](https://git.produktor.io/eSlider/2dph/issues/16) closed.
 [#30](https://git.produktor.io/eSlider/2dph/issues/30) OQ3 duckdb-go — **in**.
 [#29](https://git.produktor.io/eSlider/2dph/issues/29) OQ1 contradiction
 resolution — **in** (`temporal_freshness`, `authority_pairing`).
+[#34](https://git.produktor.io/eSlider/2dph/issues/34) D23 flaggy CLI — **in**.
+[#36](https://git.produktor.io/eSlider/2dph/issues/36) OQ5/D24 fact intervals /
+as-of — **in** (not D16 `temporal_freshness`).
 
 ## Blockers
 
-None for epic #16 (closed). Remaining v2: OQ4.
+None for epic #16 (closed). Remaining v2: OQ4 (deferred).
 
 ```
 question
@@ -59,6 +62,8 @@ question
 ## Not v1
 
 OQ4 YAML-first leafs.
+OQ5/D24 fact intervals + as-of — **in**
+([#36](https://git.produktor.io/eSlider/2dph/issues/36)).
 OCR (OQ2), duckdb-go (OQ3/D22), and D16 adjudication (OQ1) are in.
 
 ## Close epic #16 when

docs/runbook.md

@@ -53,11 +53,15 @@ bin/brain/add.go --text "arc-1 runs Matrix" --root facts --source "compose.yml x
 bin/brain/index.go --rebuild --with-facts --with-chats
 bin/brain/search.go "LadybugDB vector index"     # facts → info → web (D17)
 bin/brain/search.go "upstream flag" --no-web
+bin/brain/search.go "who works where" --as-of 2025-01-01  # D24 intervals
+source <(./bin/cli/complete.go bash)            # D23 flaggy complete
 bin/brain/get.go <id> --body
 bin/brain/stats.go
 ```
 
-`--hop N` walks File → Commit → Person from each hit. Empty web results are `throttled`, not absence.
+`--hop N` walks File → Commit → Person from each hit. `--as-of YYYY-MM-DD`
+keeps leafs whose `valid_from`/`valid_to` cover that day (empty interval =
+legacy always-on). Empty web results are `throttled`, not absence.
 Gap to v1: [roadmap](roadmap.md) / [epic #16](https://git.produktor.io/eSlider/2dph/issues/16).
 
 Ladybug 0.19: never `DROP INDEX` FTS/VECTOR (ghost catalog). Fresh indexes =
@@ -65,6 +69,16 @@ delete `var/kb.lbug` then `--rebuild`.
 
 ## HTTP / MCP
 
+```bash
+bin/stack/start                 # brain :8630, wait until MCP search/get/audit
+bin/stack/status                # YAML: brain / reasoner / picoclaw
+bin/stack/start-assistant       # + qwen3.5:9b + PicoClaw agent (ask the brain)
+bin/stack/start-assistant --no-attach
+bin/stack/stop                  # compose stop; volumes kept
+```
+
+Same Compose services by hand:
+
 ```bash
 docker compose up -d brain                       # :8630 Zig CGO serve
 docker compose --profile index run --rm index    # rebuild
@@ -72,6 +86,7 @@ docker compose --profile picoclaw up brain-mcp   # MCP 127.0.0.1:8630
 ```
 
 `GET /openapi.json`, `POST /mcp`. Agent tool order: `search` → `get` → `audit`.
+See [picoclaw.md](picoclaw.md).
 
 ## Reasoner (optional, D18)
 

go.mod

@@ -9,6 +9,7 @@ require (
 	github.com/daulet/tokenizers v1.27.0
 	github.com/duckdb/duckdb-go/v2 v2.10505.0
 	github.com/go-git/go-git/v5 v5.19.2
+	github.com/integrii/flaggy v1.8.0
 	golang.org/x/sys v0.47.0
 	golang.org/x/text v0.40.0
 	modernc.org/sqlite v1.56.0

go.sum

@@ -77,6 +77,8 @@ github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
 github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
+github.com/integrii/flaggy v1.8.0 h1:tC1qWwg4fhF2Qdaj+MpPK04cxlOSq0+HoMZqAW6Arao=
+github.com/integrii/flaggy v1.8.0/go.mod h1:QS4c80m87SXG0pmVUT/Lx2RY5EbkLvLp7IKBD2jwcFA=
 github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 h1:BQSFePA1RWJOlocH6Fxy8MmwDt+yVQYULKfN0RoTN8A=
 github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99/go.mod h1:1lJo3i6rXxKeerYnT8Nvf0QmHCRC1n8sfWVwXF2Frvo=
 github.com/kevinburke/ssh_config v1.2.0 h1:x584FjTGwHzMwvHx18PXxbBVzfnxogHaAReU4gf13a4=

internal/brain/db.go

@@ -85,9 +85,18 @@ func openWithSandbox(epsv string) error {
 		closeBrain()
 		return fmt.Errorf("LOAD EXTENSION VECTOR: %w", err)
 	}
+	migrateIntervalColumns()
 	return nil
 }
 
+// migrateIntervalColumns adds D24 valid_from/valid_to on existing Leaf tables.
+// Fresh CREATE already has them; ALTER is a no-op when the column exists.
+func migrateIntervalColumns() {
+	for _, col := range []string{"valid_from", "valid_to"} {
+		_, _ = conn.Query("ALTER TABLE Leaf ADD " + col + " STRING")
+	}
+}
+
 func closeBrain() {
 	if conn != nil {
 		conn.Close()

internal/brain/http.go

@@ -21,8 +21,8 @@ func Ready() error {
 // HTTP is the in-process API used by bin/brain/serve.go.
 type HTTP struct{}
 
-func (HTTP) Search(ctx context.Context, query string, limit int) ([]byte, error) {
+func (HTTP) Search(ctx context.Context, query string, limit int, asOf string) ([]byte, error) {
-	hits, err := searchHits(query, "", "", limit)
+	hits, err := searchHits(query, "", "", limit, asOf)
 	if err != nil {
 		return nil, err
 	}
@@ -41,7 +41,7 @@ func (HTTP) Search(ctx context.Context, query string, limit int) ([]byte, error)
 	var buf bytes.Buffer
 	enc := json.NewEncoder(&buf)
 	enc.SetEscapeHTML(false)
-	if err := enc.Encode(toJSONOut(hits, query, "", webOut)); err != nil {
+	if err := enc.Encode(toJSONOut(hits, query, "", asOf, webOut)); err != nil {
 		return nil, err
 	}
 	return buf.Bytes(), nil

internal/brain/rank/args.go

@@ -3,12 +3,16 @@ package rank
 import (
 	"fmt"
 	"strconv"
-	"strings"
+
+	"github.com/eSlider/2dph/internal/cli"
+	"github.com/eSlider/2dph/internal/facts"
+	"github.com/integrii/flaggy"
 )
 
-const Usage = `usage: bin/brain/search.go "query" [--root facts|info] [--repo REPO] [-n N] [--hop N] [--json] [--no-web]
+const Usage = `usage: bin/brain/search.go "query" [--root facts|info] [--repo REPO] [-n N] [--hop N] [--as-of YYYY-MM-DD] [--json] [--no-web]
        bin/brain/search.go serve [port]
-       bin/brain/search.go --list-model`
+       bin/brain/search.go --list-model
+       source <(./bin/cli/complete.go bash)`
 
 type Options struct {
 	Query     string
@@ -16,67 +20,71 @@ type Options struct {
 	Repo      string
 	Limit     int
 	Hop       int
+	AsOf      string
 	JSONOut   bool
 	ListModel bool
 	NoWeb     bool
 }
 
+// NewParser is the flaggy schema for search (also used by bin/cli/complete.go).
+func NewParser(opt *Options) *flaggy.Parser {
+	if opt.Limit == 0 {
+		opt.Limit = 20
+	}
+	p := cli.New("brain-search")
+	p.Description = "deduction search: facts → info → web"
+	p.String(&opt.Root, "", "root", "facts or info")
+	p.String(&opt.Repo, "", "repo", "filter by repo")
+	p.Int(&opt.Limit, "n", "n", "max hits")
+	p.Int(&opt.Hop, "", "hop", "walk FROM_FILE depth 1-3")
+	p.String(&opt.AsOf, "", "as-of", "keep facts active on YYYY-MM-DD (D24)")
+	p.Bool(&opt.JSONOut, "", "json", "JSON output")
+	p.Bool(&opt.NoWeb, "", "no-web", "stay local")
+	p.Bool(&opt.ListModel, "", "list-model", "print embedding model")
+	return p
+}
+
 // ParseArgs reads flags. Unknown flags are an error: silently dropping them
 // meant `--hop 1` vanished and its argument `1` was appended to the query.
 func ParseArgs(args []string) (Options, error) {
 	opt := Options{Limit: 20}
-	var queryArgs []string
+	p := NewParser(&opt)
-
+	var q string
-	for i := 0; i < len(args); i++ {
+	p.AddPositionalValue(&q, "query", 1, false, "search query")
-		arg := args[i]
+	if err := cli.Parse(p, args); err != nil {
-		wantsValue := arg == "--root" || arg == "--repo" || arg == "-n" || arg == "--hop"
+		return opt, err
-		if wantsValue && i+1 >= len(args) {
+	}
-			return opt, fmt.Errorf("%s needs a value", arg)
+	opt.Query = cli.Query(q, p.TrailingArguments)
+	if opt.Root != "" && opt.Root != "facts" && opt.Root != "info" {
+		return opt, fmt.Errorf("--root must be facts or info, got %q", opt.Root)
+	}
+	if opt.Limit < 1 {
+		return opt, fmt.Errorf("-n must be a positive integer, got %q", strconv.Itoa(opt.Limit))
+	}
+	if opt.Hop < 0 {
+		return opt, fmt.Errorf("--hop must be a positive integer, got %q", strconv.Itoa(opt.Hop))
+	}
+	if opt.Hop > 3 {
+		return opt, fmt.Errorf("--hop max is 3 (File → Commit → Person)")
+	}
+	if opt.AsOf != "" {
+		day := facts.NormalizeDay(opt.AsOf)
+		if len(day) != 10 || day[4] != '-' || day[7] != '-' {
+			return opt, fmt.Errorf("--as-of must be YYYY-MM-DD, got %q", opt.AsOf)
 		}
-		switch arg {
+		opt.AsOf = day
-		case "--root":
-			i++
-			opt.Root = args[i]
-			if opt.Root != "facts" && opt.Root != "info" {
-				return opt, fmt.Errorf("--root must be facts or info, got %q", opt.Root)
-			}
-		case "--repo":
-			i++
-			opt.Repo = args[i]
-		case "-n":
-			i++
-			n, err := strconv.Atoi(args[i])
-			if err != nil || n < 1 {
-				return opt, fmt.Errorf("-n must be a positive integer, got %q", args[i])
-			}
-			opt.Limit = n
-		case "--hop":
-			i++
-			n, err := strconv.Atoi(args[i])
-			if err != nil || n < 1 {
-				return opt, fmt.Errorf("--hop must be a positive integer, got %q", args[i])
-			}
-			if n > 3 {
-				return opt, fmt.Errorf("--hop max is 3 (File → Commit → Person)")
-			}
-			opt.Hop = n
-		case "--json":
-			opt.JSONOut = true
-		case "--no-web":
-			opt.NoWeb = true
-		case "--list-model":
-			opt.ListModel = true
-		default:
-			if strings.HasPrefix(arg, "-") {
-				return opt, fmt.Errorf("unknown flag %q", arg)
-			}
-			queryArgs = append(queryArgs, arg)
-		}
 	}
-
-	opt.Query = strings.TrimSpace(strings.Join(queryArgs, " "))
 	if opt.Query == "" && !opt.ListModel {
 		return opt, fmt.Errorf("no query given")
 	}
 	return opt, nil
 }
+
+// Parser is the search schema for bin/cli/complete.go.
+func Parser() *flaggy.Parser {
+	opt := Options{Limit: 20}
+	p := NewParser(&opt)
+	var q string
+	p.AddPositionalValue(&q, "query", 1, false, "search query")
+	return p
+}

internal/brain/rank/asof_test.go

@@ -0,0 +1,34 @@
+package rank
+
+import "testing"
+
+func TestFilterAsOfKeepsXDropsY(t *testing.T) {
+	hits := []Hit{
+		{ID: "x", Text: "Andrey works at X", ValidFrom: "2024-03-01", ValidTo: "2025-07-15"},
+		{ID: "y", Text: "Andrey works at Y", ValidFrom: "2025-07-16", ValidTo: ""},
+		{ID: "legacy", Text: "always true claim", ValidFrom: "", ValidTo: ""},
+	}
+	out := FilterAsOf(hits, "2025-01-01")
+	if len(out) != 2 {
+		t.Fatalf("len=%d want 2: %+v", len(out), out)
+	}
+	if out[0].ID != "x" || out[1].ID != "legacy" {
+		t.Fatalf("got %+v", out)
+	}
+	if FilterAsOf(hits, "") == nil || len(FilterAsOf(hits, "")) != 3 {
+		t.Fatal("empty as-of must keep all")
+	}
+}
+
+func TestParseArgsAsOf(t *testing.T) {
+	opt, err := ParseArgs([]string{"who works where", "--as-of", "2025-01-01", "--json"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if opt.AsOf != "2025-01-01" {
+		t.Fatalf("AsOf=%q", opt.AsOf)
+	}
+	if _, err := ParseArgs([]string{"q", "--as-of", "not-a-date"}); err == nil {
+		t.Fatal("expected bad as-of error")
+	}
+}

internal/brain/rank/query.go

@@ -3,10 +3,12 @@ package rank
 // BM25 ranks best-first, so the top hits are the *highest* scores; cosine
 // distance ranks best-first ascending. Both mirror kblib.py.
 const FTSStmt = "CALL QUERY_FTS_INDEX('Leaf', 'id', $q) " +
-	"RETURN node.id, node.text, node.root, node.source, score, node.confidence ORDER BY score DESC LIMIT $n"
+	"RETURN node.id, node.text, node.root, node.source, score, node.confidence, " +
+	"node.valid_from, node.valid_to ORDER BY score DESC LIMIT $n"
 
 const VecStmt = "CALL QUERY_VECTOR_INDEX('Leaf', 'Leaf_vec', $q, $n) " +
-	"RETURN node.id, node.text, node.root, node.source, distance, node.confidence ORDER BY distance LIMIT $n"
+	"RETURN node.id, node.text, node.root, node.source, distance, node.confidence, " +
+	"node.valid_from, node.valid_to ORDER BY distance LIMIT $n"
 
 // HopStmt is the Cypher walk from a search hit. Depth 1 = File, 2 = Commit, 3 = Person.
 func HopStmt(depth int) string {

internal/brain/rank/rank.go

@@ -5,6 +5,8 @@ package rank
 import (
 	"sort"
 	"strings"
+
+	"github.com/eSlider/2dph/internal/facts"
 )
 
 type HopNode struct {
@@ -23,17 +25,24 @@ type Hit struct {
 	Source     string    `json:"-"`
 	Score      float64   `json:"score"`
 	Snippet    string    `json:"snippet,omitempty"`
+	ValidFrom  string    `json:"valid_from,omitempty"`
+	ValidTo    string    `json:"valid_to,omitempty"`
 	Hops       []HopNode `json:"hops,omitempty"`
 }
 
 // rrfK dampens the contribution of low ranks; same constant as kblib.py.
 const rrfK = 60
 
-// RankAndFilter fuses the two hit lists, applies --root/--repo, then cuts to
+// RankAndFilter fuses the two hit lists, applies --root/--repo/--as-of, then
-// limit. Cutting first dropped every matching leaf ranked below the cut, so
+// cuts to limit. Cutting first dropped every matching leaf ranked below the
-// `--root facts` came back empty whenever info leafs filled the top N.
+// cut, so `--root facts` came back empty whenever info leafs filled the top N.
-// limit <= 0 keeps everything.
+// limit <= 0 keeps everything. asOf empty skips interval filter (D24).
 func RankAndFilter(fts, vec []Hit, root, repo string, limit int) []Hit {
+	return RankAndFilterAsOf(fts, vec, root, repo, "", limit)
+}
+
+// RankAndFilterAsOf is RankAndFilter with D24 fact-interval filter.
+func RankAndFilterAsOf(fts, vec []Hit, root, repo, asOf string, limit int) []Hit {
 	out := Hybrid(fts, vec, 0)
 	if root != "" {
 		out = FilterRoot(out, root)
@@ -41,12 +50,30 @@ func RankAndFilter(fts, vec []Hit, root, repo string, limit int) []Hit {
 	if repo != "" {
 		out = FilterRepo(out, repo)
 	}
+	if asOf != "" {
+		out = FilterAsOf(out, asOf)
+	}
 	if limit > 0 && len(out) > limit {
 		out = out[:limit]
 	}
 	return out
 }
 
+// FilterAsOf keeps hits whose [valid_from, valid_to] covers asOf (D24).
+// Empty intervals stay (legacy leafs). Empty asOf keeps all.
+func FilterAsOf(hits []Hit, asOf string) []Hit {
+	if asOf == "" {
+		return hits
+	}
+	var out []Hit
+	for _, h := range hits {
+		if facts.ActiveAt(h.ValidFrom, h.ValidTo, asOf) {
+			out = append(out, h)
+		}
+	}
+	return out
+}
+
 // Hybrid merges FTS and vector hits by reciprocal rank fusion.
 // limit <= 0 returns the full fused list.
 func Hybrid(fts, vec []Hit, limit int) []Hit {

internal/brain/rank/readargs.go

@@ -0,0 +1,59 @@
+package rank
+
+import (
+	"fmt"
+
+	"github.com/eSlider/2dph/internal/cli"
+	"github.com/integrii/flaggy"
+)
+
+type GetOptions struct {
+	ID      string
+	Body    bool
+	JSONOut bool
+}
+
+func GetParser(opt *GetOptions) *flaggy.Parser {
+	p := cli.New("brain-get")
+	p.Description = "read one leaf"
+	p.Bool(&opt.Body, "", "body", "full text instead of snippet")
+	p.Bool(&opt.JSONOut, "", "json", "JSON output")
+	p.AddPositionalValue(&opt.ID, "id", 1, false, "leaf id")
+	return p
+}
+
+func ParseGet(args []string) (GetOptions, error) {
+	var opt GetOptions
+	if err := cli.Parse(GetParser(&opt), args); err != nil {
+		return opt, err
+	}
+	if opt.ID == "" {
+		return opt, fmt.Errorf("id required")
+	}
+	return opt, nil
+}
+
+type JSONFlag struct {
+	JSONOut bool
+}
+
+func bindJSON(name string, opt *JSONFlag) *flaggy.Parser {
+	p := cli.New(name)
+	p.Bool(&opt.JSONOut, "", "json", "JSON output")
+	return p
+}
+
+func StatsParser() *flaggy.Parser {
+	opt := JSONFlag{}
+	return bindJSON("brain-stats", &opt)
+}
+
+func EvalParser() *flaggy.Parser {
+	opt := JSONFlag{}
+	return bindJSON("brain-eval", &opt)
+}
+
+func ParseJSONFlag(name string, args []string) (JSONFlag, error) {
+	var opt JSONFlag
+	return opt, cli.Parse(bindJSON(name, &opt), args)
+}

internal/brain/read.go

@@ -11,30 +11,15 @@ import (
 	"unicode/utf8"
 
 	"github.com/eSlider/2dph/internal/brain/rank"
+	"github.com/eSlider/2dph/internal/cli"
 )
 
 func MainGet(args []string) int {
-	id, body, jsonOut := "", false, false
+	opt, err := rank.ParseGet(args)
-	for _, a := range args {
+	if err != nil {
-		switch {
+		return cli.Fail(err)
-		case a == "--body":
-			body = true
-		case a == "--json":
-			jsonOut = true
-		case a == "-h" || a == "--help":
-			fmt.Fprintln(os.Stderr, `usage: bin/brain/get.go <id> [--body] [--json]`)
-			return 0
-		case strings.HasPrefix(a, "-"):
-			fmt.Fprintf(os.Stderr, "brain/get: unknown flag %s\n", a)
-			return 2
-		default:
-			id = a
-		}
-	}
-	if id == "" {
-		fmt.Fprintln(os.Stderr, "brain/get: id required")
-		return 2
 	}
+	id, body, jsonOut := opt.ID, opt.Body, opt.JSONOut
 	if err := openBrain(); err != nil {
 		fmt.Fprintf(os.Stderr, "open brain: %v\n", err)
 		return 1
@@ -72,21 +57,11 @@ func MainGet(args []string) int {
 }
 
 func MainStats(args []string) int {
-	jsonOut := false
+	opt, err := rank.ParseJSONFlag("brain-stats", args)
-	for _, a := range args {
+	if err != nil {
-		switch a {
+		return cli.Fail(err)
-		case "--json":
-			jsonOut = true
-		case "-h", "--help":
-			fmt.Fprintln(os.Stderr, `usage: bin/brain/stats.go [--json]`)
-			return 0
-		default:
-			if strings.HasPrefix(a, "-") {
-				fmt.Fprintf(os.Stderr, "brain/stats: unknown flag %s\n", a)
-				return 2
-			}
-		}
 	}
+	jsonOut := opt.JSONOut
 	if err := openBrain(); err != nil {
 		fmt.Fprintf(os.Stderr, "open brain: %v\n", err)
 		return 1
@@ -124,21 +99,11 @@ func MainStats(args []string) int {
 }
 
 func MainEval(args []string) int {
-	jsonOut := false
+	opt, err := rank.ParseJSONFlag("brain-eval", args)
-	for _, a := range args {
+	if err != nil {
-		switch a {
+		return cli.Fail(err)
-		case "--json":
-			jsonOut = true
-		case "-h", "--help":
-			fmt.Fprintln(os.Stderr, `usage: bin/brain/eval.go [--json]`)
-			return 0
-		default:
-			if strings.HasPrefix(a, "-") {
-				fmt.Fprintf(os.Stderr, "brain/eval: unknown flag %s\n", a)
-				return 2
-			}
-		}
 	}
+	jsonOut := opt.JSONOut
 	if err := openBrain(); err != nil {
 		fmt.Fprintf(os.Stderr, "open brain: %v\n", err)
 		return 1

internal/brain/search.go

@@ -20,6 +20,7 @@ import (
 
 	lbug "github.com/LadybugDB/go-ladybug"
 	"github.com/eSlider/2dph/internal/brain/rank"
+	"github.com/eSlider/2dph/internal/cli"
 )
 
 const defaultPort = 17830
@@ -29,6 +30,9 @@ const healthPath = "/health"
 func runSearch(args []string) int {
 	opt, err := rank.ParseArgs(args)
 	if err != nil {
+		if errors.Is(err, cli.ErrHelp) {
+			return 0
+		}
 		fmt.Fprintf(os.Stderr, "brain/search: %v\n%s\n", err, rank.Usage)
 		return 2
 	}
@@ -51,7 +55,7 @@ func runSearch(args []string) int {
 	}
 	defer closeBrain()
 
-	hits, err := searchHits(query, root, repo, limit)
+	hits, err := searchHits(query, root, repo, limit, opt.AsOf)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "search: %v\n", err)
 		return 1
@@ -81,6 +85,7 @@ func runSearch(args []string) int {
 	out := Dict{
 		{"query", query},
 		{"root_filter", root},
+		{"as_of", opt.AsOf},
 		{"count", len(results)},
 		{"results", resultsToDicts(results)},
 	}
@@ -92,13 +97,13 @@ func runSearch(args []string) int {
 		enc := json.NewEncoder(os.Stdout)
 		enc.SetIndent("", "  ")
 		enc.SetEscapeHTML(false)
-		return b2i(enc.Encode(toJSONOut(results, query, root, webOut)))
+		return b2i(enc.Encode(toJSONOut(results, query, root, opt.AsOf, webOut)))
 	}
 	fmt.Print(toYAML(out, 0))
 	return 0
 }
 
-func searchHits(query, root, repo string, limit int) ([]Hit, error) {
+func searchHits(query, root, repo string, limit int, asOf string) ([]Hit, error) {
 	emb, err := embedQuery(query)
 	if err != nil {
 		return nil, fmt.Errorf("embed: %w", err)
@@ -111,7 +116,7 @@ func searchHits(query, root, repo string, limit int) ([]Hit, error) {
 	if vec, err = queryVector(emb, limit*3); err != nil {
 		fmt.Fprintf(os.Stderr, "vec: %v\n", err)
 	}
-	return rank.RankAndFilter(fts, vec, root, repo, limit), nil
+	return rank.RankAndFilterAsOf(fts, vec, root, repo, asOf, limit), nil
 }
 
 func attachHops(hits []Hit, n int) error {
@@ -216,15 +221,35 @@ func rowsToHits(res *lbug.QueryResult) ([]Hit, error) {
 		if len(vals) >= 6 {
 			conf = fmt.Sprint(vals[5])
 		}
-		hits = append(hits, Hit{ID: id, Text: text, Root: root, Source: source, Score: score, Confidence: conf})
+		vf, vt := "", ""
+		if len(vals) >= 8 {
+			vf = nullStr(vals[6])
+			vt = nullStr(vals[7])
+		}
+		hits = append(hits, Hit{
+			ID: id, Text: text, Root: root, Source: source, Score: score,
+			Confidence: conf, ValidFrom: vf, ValidTo: vt,
+		})
 	}
 	return hits, nil
 }
 
+func nullStr(v any) string {
+	if v == nil {
+		return ""
+	}
+	s := fmt.Sprint(v)
+	if s == "<nil>" {
+		return ""
+	}
+	return s
+}
+
 // JSON output types
 type jsonOut struct {
 	Query      string             `json:"query"`
 	RootFilter string             `json:"root_filter"`
+	AsOf       string             `json:"as_of,omitempty"`
 	Count      int                `json:"count"`
 	Results    []jsonHit          `json:"results"`
 	Web        *rank.SecondSource `json:"web,omitempty"`
@@ -237,10 +262,12 @@ type jsonHit struct {
 	Confidence string         `json:"confidence,omitempty"`
 	Score      float64        `json:"score"`
 	Snippet    string         `json:"snippet,omitempty"`
+	ValidFrom  string         `json:"valid_from,omitempty"`
+	ValidTo    string         `json:"valid_to,omitempty"`
 	Hops       []rank.HopNode `json:"hops,omitempty"`
 }
 
-func toJSONOut(hits []Hit, query, rootFilter string, web *rank.SecondSource) *jsonOut {
+func toJSONOut(hits []Hit, query, rootFilter, asOf string, web *rank.SecondSource) *jsonOut {
 	out := make([]jsonHit, len(hits))
 	for i, h := range hits {
 		out[i] = jsonHit{
@@ -250,12 +277,15 @@ func toJSONOut(hits []Hit, query, rootFilter string, web *rank.SecondSource) *js
 			Confidence: h.Confidence,
 			Score:      h.Score,
 			Snippet:    h.Snippet,
+			ValidFrom:  h.ValidFrom,
+			ValidTo:    h.ValidTo,
 			Hops:       h.Hops,
 		}
 	}
 	return &jsonOut{
 		Query:      query,
 		RootFilter: rootFilter,
+		AsOf:       asOf,
 		Count:      len(hits),
 		Results:    out,
 		Web:        web,
@@ -274,6 +304,12 @@ func resultsToDicts(hits []Hit) []any {
 		if h.Confidence != "" {
 			d = append(d, KV{"confidence", h.Confidence})
 		}
+		if h.ValidFrom != "" {
+			d = append(d, KV{"valid_from", h.ValidFrom})
+		}
+		if h.ValidTo != "" {
+			d = append(d, KV{"valid_to", h.ValidTo})
+		}
 		if h.Snippet != "" {
 			d = append(d, KV{"snippet", h.Snippet})
 		}

internal/chats/apply.go

@@ -3,21 +3,22 @@ package chats
 import (
 	"bytes"
 	"encoding/json"
-	"flag"
 	"fmt"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"strings"
+
+	cliparse "github.com/eSlider/2dph/internal/cli"
 )
 
 type ooContact struct {
-	ID         int    `json:"id"`
+	ID          int    `json:"id"`
 	DisplayName string `json:"displayName"`
-	FirstName  string `json:"firstName"`
+	FirstName   string `json:"firstName"`
-	LastName   string `json:"lastName"`
+	LastName    string `json:"lastName"`
-	About      string `json:"about"`
+	About       string `json:"about"`
-	CommonData []struct {
+	CommonData  []struct {
 		InfoType int    `json:"infoType"`
 		Data     string `json:"data"`
 		Category string `json:"categoryName"`
@@ -25,16 +26,9 @@ type ooContact struct {
 }
 
 func RunApply(args []string) int {
-	fs := flag.NewFlagSet("chats apply", flag.ContinueOnError)
+	dryRun, err := parseApplyFlags(args)
-	dryRun := fs.Bool("dry-run", false, "show what would be done without writing")
+	if err != nil {
-	help := fs.Bool("help", false, "")
+		return cliparse.Fail(err)
-	fs.SetOutput(os.Stderr)
-	if err := fs.Parse(args); err != nil {
-		return 2
-	}
-	if *help {
-		fmt.Fprintln(os.Stderr, "usage: chats apply [--dry-run]")
-		return 0
 	}
 
 	ooCLI := findOO()
@@ -60,10 +54,10 @@ func RunApply(args []string) int {
 	emailFacts = dedupeFacts(emailFacts)
 
 	type resolvedFact struct {
-		Fact       ExtractedFact
+		Fact   ExtractedFact
-		OoID       int
+		OoID   int
-		OoName     string
+		OoName string
-		Action     string // "info-add" or "persons-create"
+		Action string // "info-add" or "persons-create"
 	}
 
 	var resolved []resolvedFact
@@ -128,7 +122,7 @@ func RunApply(args []string) int {
 
 	fmt.Printf("\nchats apply: %d actions to apply\n", len(resolved))
 
-	if *dryRun {
+	if dryRun {
 		for _, r := range resolved {
 			switch r.Action {
 			case "info-add":

internal/chats/cli.go

@@ -0,0 +1,74 @@
+package chats
+
+import (
+	cliparse "github.com/eSlider/2dph/internal/cli"
+	"github.com/integrii/flaggy"
+)
+
+type syncTelegramFlags struct {
+	Limit int
+	Phone string
+}
+
+type syncLinkedInFlags struct {
+	Limit   int
+	Refresh bool
+}
+
+func SyncParser() *flaggy.Parser {
+	p := cliparse.New("chats-sync")
+	p.Description = "download chats to var/chats"
+	tg := flaggy.NewSubcommand("telegram")
+	li := flaggy.NewSubcommand("linkedin")
+	var limit int
+	var phone string
+	var refresh bool
+	tg.Int(&limit, "", "limit", "max messages per chat")
+	tg.String(&phone, "", "phone", "phone (default TELEGRAM_PHONE)")
+	li.Int(&limit, "", "limit", "max messages per conversation")
+	li.Bool(&refresh, "", "refresh", "refresh webtop session")
+	p.AttachSubcommand(tg, 1)
+	p.AttachSubcommand(li, 1)
+	return p
+}
+
+func ImportParser() *flaggy.Parser {
+	return cliparse.New("chats-import")
+}
+
+func FactsParser() *flaggy.Parser {
+	return cliparse.New("chats-facts")
+}
+
+func ApplyParser() *flaggy.Parser {
+	p := cliparse.New("chats-apply")
+	dry := false
+	p.Bool(&dry, "", "dry-run", "show without writing")
+	return p
+}
+
+func parseTelegramFlags(args []string) (syncTelegramFlags, error) {
+	var f syncTelegramFlags
+	p := cliparse.New("chats-sync-telegram")
+	p.Int(&f.Limit, "", "limit", "max messages per chat")
+	p.String(&f.Phone, "", "phone", "phone (default TELEGRAM_PHONE)")
+	return f, cliparse.Parse(p, args)
+}
+
+func parseLinkedInFlags(args []string) (syncLinkedInFlags, error) {
+	var f syncLinkedInFlags
+	p := cliparse.New("chats-sync-linkedin")
+	p.Int(&f.Limit, "", "limit", "max messages per conversation")
+	p.Bool(&f.Refresh, "", "refresh", "refresh webtop session")
+	return f, cliparse.Parse(p, args)
+}
+
+func parseApplyFlags(args []string) (dryRun bool, err error) {
+	p := cliparse.New("chats-apply")
+	p.Bool(&dryRun, "", "dry-run", "show without writing")
+	return dryRun, cliparse.Parse(p, args)
+}
+
+func parseNoFlags(name string, args []string) error {
+	return cliparse.Parse(cliparse.New(name), args)
+}

internal/chats/facts.go

@@ -3,12 +3,13 @@ package chats
 import (
 	"bufio"
 	"encoding/json"
-	"flag"
 	"fmt"
 	"os"
 	"path/filepath"
 	"regexp"
 	"strings"
+
+	cliparse "github.com/eSlider/2dph/internal/cli"
 )
 
 var (
@@ -76,15 +77,8 @@ type ExtractedFact struct {
 }
 
 func RunFacts(args []string) int {
-	fs := flag.NewFlagSet("chats facts", flag.ContinueOnError)
+	if err := parseNoFlags("chats-facts", args); err != nil {
-	help := fs.Bool("help", false, "")
+		return cliparse.Fail(err)
-	fs.SetOutput(os.Stderr)
-	if err := fs.Parse(args); err != nil {
-		return 2
-	}
-	if *help {
-		fmt.Fprintln(os.Stderr, "usage: chats facts")
-		return 0
 	}
 
 	root := Dir()

internal/chats/import.go

@@ -4,25 +4,19 @@ import (
 	"bufio"
 	"bytes"
 	"encoding/json"
-	"flag"
 	"fmt"
 	"html"
 	"os"
 	"path/filepath"
 	"sort"
 	"strings"
+
+	cliparse "github.com/eSlider/2dph/internal/cli"
 )
 
 func RunImport(args []string) int {
-	fs := flag.NewFlagSet("chats import", flag.ContinueOnError)
+	if err := parseNoFlags("chats-import", args); err != nil {
-	help := fs.Bool("help", false, "")
+		return cliparse.Fail(err)
-	fs.SetOutput(os.Stderr)
-	if err := fs.Parse(args); err != nil {
-		return 2
-	}
-	if *help {
-		fmt.Fprintln(os.Stderr, "usage: chats import")
-		return 0
 	}
 
 	root := Dir()

internal/chats/sync_linkedin.go

@@ -2,12 +2,13 @@ package chats
 
 import (
 	"context"
-	"flag"
 	"fmt"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"time"
+
+	cliparse "github.com/eSlider/2dph/internal/cli"
 )
 
 func checkLinkedInSession(userDataDir string) (bool, error) {
@@ -29,18 +30,12 @@ func checkLinkedInSession(userDataDir string) (bool, error) {
 }
 
 func RunSyncLinkedIn(args []string) int {
-	fs := flag.NewFlagSet("chats sync linkedin", flag.ContinueOnError)
+	f, err := parseLinkedInFlags(args)
-	limit := fs.Int("limit", 0, "max messages per conversation (0 = all)")
+	if err != nil {
-	refresh := fs.Bool("refresh", false, "refresh session from live webtop browser before sync")
+		return cliparse.Fail(err)
-	help := fs.Bool("help", false, "")
-	fs.SetOutput(os.Stderr)
-	if err := fs.Parse(args); err != nil {
-		return 2
-	}
-	if *help {
-		fmt.Fprintln(os.Stderr, "usage: chats sync linkedin [--limit N] [--refresh]")
-		return 0
 	}
+	limit := f.Limit
+	refresh := f.Refresh
 
 	userDataDir := envVar("LINKEDIN_USER_DATA_DIR", "")
 	if userDataDir == "" {
@@ -48,7 +43,7 @@ func RunSyncLinkedIn(args []string) int {
 		userDataDir = home + "/.linkedin-mcp/profile"
 	}
 
-	if *refresh {
+	if refresh {
 		if code := refreshLinkedInSession(userDataDir); code != 0 {
 			return code
 		}
@@ -72,7 +67,7 @@ func RunSyncLinkedIn(args []string) int {
 	defer cancel()
 
 	start := time.Now()
-	if err := src.Sync(ctx, Dir(), *limit); err != nil {
+	if err := src.Sync(ctx, Dir(), limit); err != nil {
 		fmt.Fprintf(os.Stderr, "chats sync linkedin: %v\n", err)
 		return 1
 	}

internal/chats/sync_telegram.go

@@ -2,33 +2,28 @@ package chats
 
 import (
 	"context"
-	"flag"
 	"fmt"
 	"os"
 	"path/filepath"
 	"strconv"
 	"strings"
 	"time"
+
+	cliparse "github.com/eSlider/2dph/internal/cli"
 )
 
 func RunSyncTelegram(args []string) int {
-	fs := flag.NewFlagSet("chats sync telegram", flag.ContinueOnError)
+	f, err := parseTelegramFlags(args)
-	limit := fs.Int("limit", 0, "max messages per chat (0 = all)")
+	if err != nil {
-	phone := fs.String("phone", "", "phone number (default env TELEGRAM_PHONE)")
+		return cliparse.Fail(err)
-	help := fs.Bool("help", false, "")
-	fs.SetOutput(os.Stderr)
-	if err := fs.Parse(args); err != nil {
-		return 2
-	}
-	if *help {
-		fmt.Fprintln(os.Stderr, "usage: chats sync telegram [--limit N] [--phone PHONE]")
-		return 0
 	}
+	limit := f.Limit
+	phone := f.Phone
 
 	apiIDStr := envVar("TELEGRAM_API_ID", "")
 	apiHash := envVar("TELEGRAM_API_HASH", "")
 	sessionStr := envVar("TELEGRAM_SESSION_STRING", "")
-	phoneNum := *phone
+	phoneNum := phone
 	if phoneNum == "" {
 		phoneNum = envVar("TELEGRAM_PHONE", "")
 	}
@@ -78,7 +73,7 @@ func RunSyncTelegram(args []string) int {
 	defer cancel()
 
 	start := time.Now()
-	if err := src.Sync(ctx, Dir(), *limit); err != nil {
+	if err := src.Sync(ctx, Dir(), limit); err != nil {
 		fmt.Fprintf(os.Stderr, "chats sync telegram: %v\n", err)
 		return 1
 	}

internal/cli/cli.go

@@ -0,0 +1,190 @@
+// Package cli is the shared flaggy wrapper (D23).
+//
+// flaggy: zero deps, flags at any position, shell completion scripts.
+// Individual tools keep ShowCompletion off so a query like "completion" is
+// not stolen; dump scripts with bin/cli/complete.go.
+package cli
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+	"sync"
+
+	"github.com/integrii/flaggy"
+)
+
+// ErrHelp means -h/--help was requested (exit 0).
+var ErrHelp = errors.New("help")
+
+var parseMu sync.Mutex
+
+// New returns a per-call parser. Never reuse: flaggy parses once.
+func New(name string) *flaggy.Parser {
+	p := flaggy.NewParser(name)
+	p.ShowVersionWithVersionFlag = false
+	p.ShowCompletion = false
+	// Extra positionals become TrailingArguments (search "two words --json").
+	// Unknown dash tokens are rejected in Parse after flaggy returns.
+	p.ShowHelpOnUnexpected = false
+	p.ShowHelpWithHFlag = true
+	return p
+}
+
+// Parse runs p.ParseArgs and turns flaggy's os.Exit into an error.
+// Not safe to call in parallel (flaggy.PanicInsteadOfExit is process-global).
+func Parse(p *flaggy.Parser, args []string) error {
+	parseMu.Lock()
+	defer parseMu.Unlock()
+	prev := flaggy.PanicInsteadOfExit
+	flaggy.PanicInsteadOfExit = true
+	defer func() { flaggy.PanicInsteadOfExit = prev }()
+
+	var exitMsg string
+	err := func() error {
+		defer func() {
+			if r := recover(); r != nil {
+				exitMsg = fmt.Sprint(r)
+			}
+		}()
+		return p.ParseArgs(args)
+	}()
+	if err != nil {
+		return err
+	}
+	if exitMsg != "" {
+		if strings.Contains(exitMsg, "code: 0") {
+			return ErrHelp
+		}
+		return errors.New(exitMsg)
+	}
+	if u := unknownFlags(p, args); len(u) > 0 {
+		return fmt.Errorf("unknown flag %q", u[0])
+	}
+	return nil
+}
+
+func unknownFlags(p *flaggy.Parser, args []string) []string {
+	flags := collectFlags(&p.Subcommand)
+	var out []string
+	skipNext := false
+	for _, a := range args {
+		if skipNext {
+			skipNext = false
+			continue
+		}
+		if a == "--" {
+			break
+		}
+		name, inline := flagName(a)
+		if name == "" {
+			continue
+		}
+		if name == "h" || name == "help" {
+			continue
+		}
+		f := findFlag(flags, name)
+		if f == nil {
+			out = append(out, a)
+			continue
+		}
+		if !inline && !isBoolFlag(f) {
+			skipNext = true
+		}
+	}
+	return out
+}
+
+func flagName(a string) (name string, inline bool) {
+	if a == "-" || !strings.HasPrefix(a, "-") {
+		return "", false
+	}
+	rest := strings.TrimLeft(a, "-")
+	name, _, inline = strings.Cut(rest, "=")
+	return name, inline
+}
+
+func collectFlags(sc *flaggy.Subcommand) []*flaggy.Flag {
+	out := append([]*flaggy.Flag{}, sc.Flags...)
+	for _, sub := range sc.Subcommands {
+		out = append(out, collectFlags(sub)...)
+	}
+	return out
+}
+
+func findFlag(flags []*flaggy.Flag, name string) *flaggy.Flag {
+	for _, f := range flags {
+		if f.HasName(name) {
+			return f
+		}
+	}
+	return nil
+}
+
+func isBoolFlag(f *flaggy.Flag) bool {
+	_, ok := f.AssignmentVar.(*bool)
+	return ok
+}
+
+// Query joins the first positional with leftover trailing words.
+func Query(first string, trailing []string) string {
+	parts := make([]string, 0, 1+len(trailing))
+	if s := strings.TrimSpace(first); s != "" {
+		parts = append(parts, s)
+	}
+	for _, t := range trailing {
+		if s := strings.TrimSpace(t); s != "" {
+			parts = append(parts, s)
+		}
+	}
+	return strings.Join(parts, " ")
+}
+
+// Code maps parse errors to process exit codes (0 help, 2 usage).
+func Code(err error) int {
+	if err == nil || errors.Is(err, ErrHelp) {
+		return 0
+	}
+	return 2
+}
+
+// Fail prints err unless it is help or a flaggy exit that already wrote stderr.
+func Fail(err error) int {
+	if err == nil || errors.Is(err, ErrHelp) {
+		return 0
+	}
+	if strings.HasPrefix(err.Error(), "Panic instead of exit") {
+		return 2
+	}
+	fmt.Fprintln(os.Stderr, err)
+	return 2
+}
+
+// Tool is one shebang CLI for completion dump.
+type Tool struct {
+	Path string
+	Name string
+	New  func() *flaggy.Parser
+}
+
+// BashScript concatenates flaggy bash complete scripts and binds each
+// function to the shebang path (./bin/subject/method.go).
+func BashScript(tools []Tool) string {
+	var b strings.Builder
+	b.WriteString("# 2dph flaggy completions (D23). source <(./bin/cli/complete.go bash)\n")
+	for _, t := range tools {
+		p := t.New()
+		p.Name = t.Name
+		script := flaggy.GenerateBashCompletion(p)
+		b.WriteString(script)
+		fn := "_" + strings.ReplaceAll(t.Name, "-", "_") + "_complete"
+		if t.Path != "" && t.Path != t.Name {
+			fmt.Fprintf(&b, "complete -F %s %s\n", fn, t.Path)
+			if !strings.HasPrefix(t.Path, "./") {
+				fmt.Fprintf(&b, "complete -F %s ./%s\n", fn, t.Path)
+			}
+		}
+	}
+	return b.String()
+}

internal/cli/cli_test.go

@@ -0,0 +1,77 @@
+package cli
+
+import (
+	"errors"
+	"strings"
+	"testing"
+
+	"github.com/integrii/flaggy"
+)
+
+func TestParseBoolAndIntAnyPosition(t *testing.T) {
+	p := New("t")
+	jsonOut := false
+	n := 20
+	q := ""
+	p.Bool(&jsonOut, "", "json", "JSON")
+	p.Int(&n, "n", "n", "limit")
+	p.AddPositionalValue(&q, "query", 1, false, "q")
+	if err := Parse(p, []string{"two", "words", "--json", "-n", "5"}); err != nil {
+		t.Fatal(err)
+	}
+	got := Query(q, p.TrailingArguments)
+	if got != "two words" || !jsonOut || n != 5 {
+		t.Fatalf("q=%q json=%v n=%d", got, jsonOut, n)
+	}
+}
+
+func TestParseUnknownFlagIsError(t *testing.T) {
+	p := New("t")
+	jsonOut := false
+	p.Bool(&jsonOut, "", "json", "JSON")
+	if err := Parse(p, []string{"--nope"}); err == nil {
+		t.Fatal("unknown flag accepted")
+	}
+}
+
+func TestParseHelpIsErrHelp(t *testing.T) {
+	p := New("t")
+	jsonOut := false
+	p.Bool(&jsonOut, "", "json", "JSON")
+	err := Parse(p, []string{"--help"})
+	if !errors.Is(err, ErrHelp) {
+		t.Fatalf("got %v", err)
+	}
+}
+
+func TestParseMissingFlagValueIsError(t *testing.T) {
+	p := New("t")
+	n := 0
+	p.Int(&n, "", "hop", "hop")
+	if err := Parse(p, []string{"--hop"}); err == nil {
+		t.Fatal("expected missing value error")
+	}
+}
+
+func TestBashScriptNamesShebangPath(t *testing.T) {
+	out := BashScript([]Tool{{
+		Path: "bin/brain/search.go",
+		Name: "brain-search",
+		New:  newSearchLike,
+	}})
+	if !strings.Contains(out, "--json") || !strings.Contains(out, "--hop") {
+		t.Fatalf("flags missing:\n%s", out)
+	}
+	if !strings.Contains(out, "complete -F") || !strings.Contains(out, "bin/brain/search.go") {
+		t.Fatalf("shebang complete missing:\n%s", out)
+	}
+}
+
+func newSearchLike() *flaggy.Parser {
+	p := New("brain-search")
+	jsonOut := false
+	hop := 0
+	p.Bool(&jsonOut, "", "json", "JSON")
+	p.Int(&hop, "", "hop", "graph hop")
+	return p
+}

internal/cli/qa.go

@@ -0,0 +1,24 @@
+package cli
+
+import "github.com/integrii/flaggy"
+
+type QAStats struct {
+	JSONL string
+}
+
+func QAParser() *flaggy.Parser {
+	c := QAStats{}
+	return BindQA(&c)
+}
+
+func BindQA(c *QAStats) *flaggy.Parser {
+	p := New("qa-stats")
+	p.Description = "DuckDB quantiles / JSONL count"
+	p.String(&c.JSONL, "", "jsonl", "JSONL file (else stdin JSON [float,…])")
+	return p
+}
+
+func ParseQAStats(args []string) (QAStats, error) {
+	var c QAStats
+	return c, Parse(BindQA(&c), args)
+}

internal/facts/interval.go

@@ -0,0 +1,44 @@
+package facts
+
+// Interval of truth for a fact leaf (D24 / OQ5). Not D16 source staleness.
+//
+// Empty valid_from and valid_to means "always" (legacy leafs). Empty asOf
+// means "do not filter". Dates compare as YYYY-MM-DD (lexicographic).
+
+// NormalizeDay keeps the calendar day from ISO-8601 or bare dates.
+func NormalizeDay(s string) string {
+	s = trimSpace(s)
+	if len(s) >= 10 && s[4] == '-' && s[7] == '-' {
+		return s[:10]
+	}
+	return s
+}
+
+func trimSpace(s string) string {
+	i, j := 0, len(s)
+	for i < j && (s[i] == ' ' || s[i] == '\t' || s[i] == '\n' || s[i] == '\r') {
+		i++
+	}
+	for j > i && (s[j-1] == ' ' || s[j-1] == '\t' || s[j-1] == '\n' || s[j-1] == '\r') {
+		j--
+	}
+	return s[i:j]
+}
+
+// ActiveAt reports whether a fact with [validFrom, validTo] holds at asOf.
+// validTo empty = open-ended. Both ends inclusive.
+func ActiveAt(validFrom, validTo, asOf string) bool {
+	asOf = NormalizeDay(asOf)
+	if asOf == "" {
+		return true
+	}
+	from := NormalizeDay(validFrom)
+	to := NormalizeDay(validTo)
+	if from != "" && asOf < from {
+		return false
+	}
+	if to != "" && asOf > to {
+		return false
+	}
+	return true
+}

internal/facts/interval_test.go

@@ -0,0 +1,73 @@
+package facts
+
+import "testing"
+
+func TestActiveAtOpenEnded(t *testing.T) {
+	// works at Y from 2025-07-16, no end
+	if !ActiveAt("2025-07-16", "", "2025-07-16") {
+		t.Fatal("inclusive valid_from")
+	}
+	if !ActiveAt("2025-07-16", "", "2026-01-01") {
+		t.Fatal("open-ended valid_to")
+	}
+	if ActiveAt("2025-07-16", "", "2025-07-15") {
+		t.Fatal("before valid_from must be inactive")
+	}
+}
+
+func TestActiveAtClosedInterval(t *testing.T) {
+	// works at X 2024-03-01 .. 2025-07-15
+	if !ActiveAt("2024-03-01", "2025-07-15", "2025-01-01") {
+		t.Fatal("mid interval")
+	}
+	if !ActiveAt("2024-03-01", "2025-07-15", "2024-03-01") {
+		t.Fatal("inclusive start")
+	}
+	if !ActiveAt("2024-03-01", "2025-07-15", "2025-07-15") {
+		t.Fatal("inclusive end")
+	}
+	if ActiveAt("2024-03-01", "2025-07-15", "2025-07-16") {
+		t.Fatal("day after end")
+	}
+	if ActiveAt("2024-03-01", "2025-07-15", "2024-02-28") {
+		t.Fatal("day before start")
+	}
+}
+
+func TestActiveAtEmptyIntervalAlwaysTrue(t *testing.T) {
+	// legacy leafs without intervals stay visible for any as-of
+	if !ActiveAt("", "", "2025-01-01") {
+		t.Fatal("empty interval must remain active")
+	}
+	if !ActiveAt("", "", "") {
+		t.Fatal("no as-of means all active")
+	}
+}
+
+func TestActiveAtEmptyAsOfKeepsAll(t *testing.T) {
+	if !ActiveAt("2099-01-01", "2099-12-31", "") {
+		t.Fatal("empty as-of must not filter")
+	}
+}
+
+func TestAsOfPickXNotY(t *testing.T) {
+	// Acceptance from #36: as of 2025-01-01 → X, not Y
+	xFrom, xTo := "2024-03-01", "2025-07-15"
+	yFrom, yTo := "2025-07-16", ""
+	asOf := "2025-01-01"
+	if !ActiveAt(xFrom, xTo, asOf) {
+		t.Fatal("X must be active as of 2025-01-01")
+	}
+	if ActiveAt(yFrom, yTo, asOf) {
+		t.Fatal("Y must be inactive as of 2025-01-01")
+	}
+}
+
+func TestNormalizeDayTrimsTime(t *testing.T) {
+	if NormalizeDay("2025-01-01T12:00:00Z") != "2025-01-01" {
+		t.Fatalf("got %q", NormalizeDay("2025-01-01T12:00:00Z"))
+	}
+	if NormalizeDay("2025-01-01") != "2025-01-01" {
+		t.Fatalf("got %q", NormalizeDay("2025-01-01"))
+	}
+}

internal/gitlog/args.go

@@ -0,0 +1,51 @@
+package gitlog
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/eSlider/2dph/internal/cli"
+	"github.com/integrii/flaggy"
+)
+
+type CLI struct {
+	Repo, Root, Since string
+	Limit             int
+	JSONOut           bool
+}
+
+func Parser() *flaggy.Parser {
+	c := CLI{}
+	return Bind(&c)
+}
+
+func Bind(c *CLI) *flaggy.Parser {
+	p := cli.New("git-import")
+	p.Description = "go-git history → commit leafs"
+	p.Bool(&c.JSONOut, "", "json", "JSON output")
+	p.Int(&c.Limit, "", "limit", "max commits (0 = all)")
+	p.String(&c.Since, "", "since", "RFC3339 or YYYY-MM-DD")
+	p.String(&c.Root, "", "root", "scan dir for git repos")
+	p.AddPositionalValue(&c.Repo, "repo", 1, false, "git repo path")
+	return p
+}
+
+func ParseArgs(args []string) (CLI, error) {
+	var c CLI
+	if err := cli.Parse(Bind(&c), args); err != nil {
+		return c, err
+	}
+	return c, nil
+}
+
+func ParseSince(s string) (time.Time, error) {
+	if s == "" {
+		return time.Time{}, nil
+	}
+	for _, layout := range []string{time.RFC3339, "2006-01-02"} {
+		if t, err := time.Parse(layout, s); err == nil {
+			return t, nil
+		}
+	}
+	return time.Time{}, fmt.Errorf("cannot parse --since %q", s)
+}

internal/httpapi/mcp.go

@@ -105,11 +105,18 @@ func (s *Server) mcpCall(r *http.Request, params json.RawMessage) (any, error) {
 		if limit < 1 || limit > 100 {
 			return mcpText(`{"error":"n must be int 1..100"}`, true), nil
 		}
+		asOf := ""
+		if raw, ok := p.Arguments["as_of"]; ok {
+			asOf = strings.TrimSpace(fmt.Sprint(raw))
+			if asOf == "<nil>" {
+				asOf = ""
+			}
+		}
 		if !s.tryAcquire(r) {
 			return nil, fmt.Errorf("cancelled")
 		}
 		defer s.release()
-		body, err = s.api.Search(r.Context(), q, limit)
+		body, err = s.api.Search(r.Context(), q, limit, asOf)
 	case "get":
 		id := strings.TrimSpace(fmt.Sprint(p.Arguments["id"]))
 		if id == "" || id == "<nil>" {

internal/httpapi/server.go

@@ -24,7 +24,7 @@ import (
 
 // API is the in-process brain surface. Production serve.go wires internal/brain.
 type API interface {
-	Search(ctx context.Context, query string, limit int) ([]byte, error)
+	Search(ctx context.Context, query string, limit int, asOf string) ([]byte, error)
 	Get(ctx context.Context, id string, body bool) ([]byte, error)
 	Stats(ctx context.Context) ([]byte, error)
 	Audit(ctx context.Context) ([]byte, error)
@@ -85,11 +85,12 @@ func (s *Server) handleSearch(w http.ResponseWriter, r *http.Request) {
 		}
 		limit = n
 	}
+	asOf := strings.TrimSpace(r.URL.Query().Get("as_of"))
 	if !s.acquire(w, r) {
 		return
 	}
 	defer s.release()
-	body, err := s.api.Search(r.Context(), q, limit)
+	body, err := s.api.Search(r.Context(), q, limit, asOf)
 	writeAPI(w, body, err)
 }
 
@@ -187,13 +188,18 @@ type ExecSearcher struct {
 	Timeout time.Duration
 }
 
-func (b ExecSearcher) Search(ctx context.Context, query string, limit int) ([]byte, error) {
+func (b ExecSearcher) Search(ctx context.Context, query string, limit int, asOf string) ([]byte, error) {
 	if b.Timeout == 0 {
 		b.Timeout = 60 * time.Second
 	}
 	ctx, cancel := context.WithTimeout(ctx, b.Timeout)
 	defer cancel()
-	cmd := exec.CommandContext(ctx, b.CmdPath, "--json", "-n", strconv.Itoa(limit), query)
+	args := []string{"--json", "-n", strconv.Itoa(limit)}
+	if asOf != "" {
+		args = append(args, "--as-of", asOf)
+	}
+	args = append(args, query)
+	cmd := exec.CommandContext(ctx, b.CmdPath, args...)
 	out, err := cmd.Output()
 	if err != nil {
 		var exitErr *exec.ExitError

internal/httpapi/server_test.go

@@ -21,10 +21,10 @@ type fakeSearcher struct {
 	calls    int
 	active   atomic.Int32
 	maxSeen  atomic.Int32
-	callback func(q string, limit int) ([]byte, error)
+	callback func(q string, limit int, asOf string) ([]byte, error)
 }
 
-func (f *fakeSearcher) Search(ctx context.Context, query string, limit int) ([]byte, error) {
+func (f *fakeSearcher) Search(ctx context.Context, query string, limit int, asOf string) ([]byte, error) {
 	f.mu.Lock()
 	f.calls++
 	f.mu.Unlock()
@@ -44,7 +44,7 @@ func (f *fakeSearcher) Search(ctx context.Context, query string, limit int) ([]b
 		}
 	}
 	if f.callback != nil {
-		return f.callback(query, limit)
+		return f.callback(query, limit, asOf)
 	}
 	return []byte(`{"query":"` + query + `","count":0,"results":[]}`), nil
 }
@@ -109,7 +109,7 @@ func TestSearchMissingQuery(t *testing.T) {
 }
 
 func TestSearchReturnsSearcherResult(t *testing.T) {
-	fs := &fakeSearcher{callback: func(q string, limit int) ([]byte, error) {
+	fs := &fakeSearcher{callback: func(q string, limit int, asOf string) ([]byte, error) {
 		return []byte(`{"query":"` + q + `","count":1,"results":[{"id":"x"}]}`), nil
 	}}
 	h := NewServer(fs, 1)
@@ -168,7 +168,7 @@ func TestSearchRejectsBadLimit(t *testing.T) {
 }
 
 func TestGetLeaf(t *testing.T) {
-	fs := &fakeSearcher{callback: func(q string, limit int) ([]byte, error) {
+	fs := &fakeSearcher{callback: func(q string, limit int, asOf string) ([]byte, error) {
 		return []byte(`{}`), nil
 	}}
 	h := NewServer(fs, 1)

internal/httpapi/spec.go

@@ -35,6 +35,7 @@ var Ops = []Op{
 		Params: []Param{
 			{Name: "q", In: "query", Type: "string", Description: "search query", Required: true},
 			{Name: "n", In: "query", Type: "integer", Description: "hit limit 1..100 (default 10)"},
+			{Name: "as_of", In: "query", Type: "string", Description: "YYYY-MM-DD; keep facts active on that day (D24)"},
 		},
 	},
 	{
@@ -54,6 +55,8 @@ var Ops = []Op{
 			{Name: "text", In: "query", Type: "string", Description: "leaf text (omit for CLI hint)"},
 			{Name: "root", In: "query", Type: "string", Description: "facts or info (default info)"},
 			{Name: "source", In: "query", Type: "string", Description: "evidence pointer; facts need two sources"},
+			{Name: "valid_from", In: "query", Type: "string", Description: "fact interval start YYYY-MM-DD (D24)"},
+			{Name: "valid_to", In: "query", Type: "string", Description: "fact interval end YYYY-MM-DD inclusive (D24)"},
 		},
 	},
 	{Path: PathOpenAPI, Method: "get", ID: "openapi", Summary: "OpenAPI 3 document for this server"},

internal/mdleaves/args.go

@@ -0,0 +1,41 @@
+package mdleaves
+
+import (
+	"github.com/eSlider/2dph/internal/cli"
+	"github.com/integrii/flaggy"
+)
+
+type CLI struct {
+	Root    string
+	Files   string
+	JSONOut bool
+}
+
+func Parser() *flaggy.Parser {
+	c := CLI{Root: "."}
+	return Bind(&c)
+}
+
+func Bind(c *CLI) *flaggy.Parser {
+	if c.Root == "" {
+		c.Root = "."
+	}
+	p := cli.New("markdown-import")
+	p.Description = "split markdown H2 leafs"
+	p.Bool(&c.JSONOut, "", "json", "JSON output")
+	p.String(&c.Files, "", "files", "comma-separated paths")
+	p.AddPositionalValue(&c.Root, "dir", 1, false, "markdown root")
+	return p
+}
+
+func ParseArgs(args []string) (CLI, error) {
+	c := CLI{Root: "."}
+	p := Bind(&c)
+	if err := cli.Parse(p, args); err != nil {
+		return c, err
+	}
+	if extra := cli.Query("", p.TrailingArguments); extra != "" && c.Root == "." {
+		c.Root = extra
+	}
+	return c, nil
+}

internal/ocr/args.go

@@ -0,0 +1,35 @@
+package ocr
+
+import (
+	"fmt"
+
+	"github.com/eSlider/2dph/internal/cli"
+	"github.com/integrii/flaggy"
+)
+
+type CLI struct {
+	Path string
+}
+
+func Parser() *flaggy.Parser {
+	c := CLI{}
+	return Bind(&c)
+}
+
+func Bind(c *CLI) *flaggy.Parser {
+	p := cli.New("mail-ocr")
+	p.Description = "tesseract eng+deu on image or scanned PDF"
+	p.AddPositionalValue(&c.Path, "file", 1, false, "image or pdf")
+	return p
+}
+
+func ParseArgs(args []string) (CLI, error) {
+	var c CLI
+	if err := cli.Parse(Bind(&c), args); err != nil {
+		return c, err
+	}
+	if c.Path == "" {
+		return c, fmt.Errorf("usage: bin/mail/ocr.go <image|pdf>")
+	}
+	return c, nil
+}

internal/reasoner/args.go

@@ -0,0 +1,47 @@
+package reasoner
+
+import (
+	"os"
+
+	"github.com/eSlider/2dph/internal/cli"
+	"github.com/integrii/flaggy"
+)
+
+type CLI struct {
+	Base    string
+	Model   string
+	Device  string
+	JSONOut bool
+}
+
+func Parser() *flaggy.Parser {
+	c := NewCLI()
+	return Bind(&c)
+}
+
+func NewCLI() CLI {
+	base := os.Getenv("REASONER_BASE_URL")
+	if base == "" {
+		base = "http://127.0.0.1:11435/v1"
+	}
+	model := os.Getenv("REASONER_MODEL")
+	if model == "" {
+		model = OllamaRAM
+	}
+	return CLI{Base: base, Model: model, Device: "cpu"}
+}
+
+func Bind(c *CLI) *flaggy.Parser {
+	p := cli.New("reasoner-bakeoff")
+	p.Description = "CPU tool-call bake-off"
+	p.Bool(&c.JSONOut, "", "json", "JSON output")
+	p.String(&c.Model, "", "model", "Ollama/HF model id")
+	p.String(&c.Base, "", "base-url", "OpenAI-compatible URL")
+	p.String(&c.Device, "", "device", "cpu")
+	return p
+}
+
+func ParseArgs(args []string) (CLI, error) {
+	c := NewCLI()
+	return c, cli.Parse(Bind(&c), args)
+}

internal/websearch/args.go

@@ -0,0 +1,63 @@
+package websearch
+
+import (
+	"fmt"
+
+	"github.com/eSlider/2dph/internal/cli"
+	"github.com/integrii/flaggy"
+)
+
+type CLI struct {
+	Query, Site, Lang, Fresh, Category, Engines string
+	Limit                                       int
+	JSONOut, Refresh, Force                     bool
+	TTL                                         float64
+	Timeout                                     int
+}
+
+func NewCLI() CLI {
+	return CLI{Limit: DefaultLimit, TTL: float64(CacheTTL), Timeout: 25}
+}
+
+func Parser() *flaggy.Parser {
+	c := NewCLI()
+	return Bind(&c)
+}
+
+func Bind(c *CLI) *flaggy.Parser {
+	p := cli.New("web-search")
+	p.Description = "SearXNG second source (throttled ≠ absence)"
+	p.Bool(&c.JSONOut, "", "json", "JSON output")
+	p.Bool(&c.Refresh, "", "refresh", "bypass cache")
+	p.Bool(&c.Force, "", "force", "allow PII in query")
+	p.Int(&c.Limit, "n", "limit", "max hits")
+	p.String(&c.Site, "", "site", "restrict to host")
+	p.String(&c.Lang, "", "lang", "language")
+	p.String(&c.Fresh, "", "fresh", "day|week|month|year")
+	p.String(&c.Category, "", "category", "searx category")
+	p.String(&c.Engines, "", "engines", "engine list")
+	p.Float64(&c.TTL, "", "ttl", "cache ttl seconds")
+	p.Int(&c.Timeout, "", "timeout", "http timeout seconds")
+	return p
+}
+
+func ParseArgs(args []string) (CLI, error) {
+	c := NewCLI()
+	p := Bind(&c)
+	var q string
+	p.AddPositionalValue(&q, "query", 1, false, "search query")
+	if err := cli.Parse(p, args); err != nil {
+		return c, err
+	}
+	c.Query = cli.Query(q, p.TrailingArguments)
+	if c.Query == "" {
+		return c, fmt.Errorf("query required")
+	}
+	if c.Limit < 0 {
+		return c, fmt.Errorf("--limit must be a non-negative integer")
+	}
+	if c.Timeout <= 0 {
+		return c, fmt.Errorf("--timeout must be a positive integer")
+	}
+	return c, nil
+}

skills/brain/SKILL.md

@@ -26,6 +26,7 @@ second independent source when local roots cannot confirm. An answer is
 bin/brain/search.go "Matrix federation"                # pointers + snippets, YAML
 bin/brain/search.go "onlyoffice postgres" --root facts # restrict to confirmed
 bin/brain/search.go "where is cs-lexicon" --json | yq '.[].ref'
+bin/brain/search.go "who works where" --as-of 2025-01-01  # D24 intervals
 bin/brain/add.go --text T --root facts --source "a.md x b.md"
 bin/brain/get.go <id> --body                           # full chunk only when needed
 bin/brain/stats.go                                     # index health
@@ -34,6 +35,8 @@ bin/brain/eval.go                                      # recall@5 >= 0.95 gate (
 
 `bin/kb/search` is a deprecated wrapper. `--hop N` walks
 `FROM_FILE` / `HAS_VERSION` / `AUTHORED` from each hit (1=File, 3=Person).
+`--as-of YYYY-MM-DD` keeps leafs whose `valid_from`/`valid_to` cover that day
+(empty interval = always; not D16 source staleness).
 
 ## Rules
 

skills/picoclaw/SKILL.md

@@ -12,6 +12,12 @@ PicoClaw speaks MCP at `POST /mcp` on `bin/brain/serve.go`. Compose profile
 `picoclaw` runs the official `sipeed/picoclaw` gateway plus `brain-mcp`
 (see [docs/picoclaw.md](../../docs/picoclaw.md)).
 
+```bash
+bin/stack/start-assistant     # brain + qwen3.5:9b + gateway + picoclaw agent
+bin/stack/status
+bin/stack/stop
+```
+
 ## Tool order (before a factual reply)
 
 1. **`search`** — facts root first, then info. The `web` block is a second