feat: brain/index.go shebang; mail import is not a brain write (D14). (#12)

Commands live at bin/brain/{index,get,stats,eval,watch}.go and
bin/mail/import.go, bin/markdown/import.go, bin/postgres/query.go.
Python remains the Ladybug write worker. index_mail is a deprecation
shim that rebuilds via --with-mail.

bin/watch/watch.go

@@ -1,4 +1,4 @@
-// Package watch polls corpus directories for changes and re-runs bin/kb/index.
+// Package watch polls corpus directories for changes and re-runs brain/index.
 //
 // Port of the former bin/kb-watch bash script to an importable, testable Go
 // package. Polls file mtimes (no inotify deps); cheap and reliable.
@@ -18,8 +18,8 @@ import (
 type Options struct {
 	Dirs     []string
 	Interval time.Duration
-	// IndexCmd is the kb/index command template. %s is replaced by the repo
-	// root (from KB_ROOT). Defaults to `python3 <root>/bin/kb/index`.
+	// IndexCmd is the index command template. %s is replaced by the repo
+	// root (from KB_ROOT). Defaults to `python3 <root>/bin/kb/index --with-mail`.
 	IndexCmd string
 }
 
@@ -67,7 +67,7 @@ func fromEnv(args []string) Options {
 	if pys == "" {
 		pys = "python3"
 	}
-	opts.IndexCmd = pys + " <root>/bin/kb/index"
+	opts.IndexCmd = pys + " <root>/bin/kb/index --with-mail"
 	return opts
 }
 

bin/watch/watch_test.go

@@ -3,6 +3,7 @@ package watch
 import (
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
 	"time"
 )
@@ -43,7 +44,10 @@ func TestFromEnvDefaults(t *testing.T) {
 	if opts.Interval != 30*time.Second {
 		t.Fatalf("default interval = %s, want 30s", opts.Interval)
 	}
-	if opts.IndexCmd == "" {
-		t.Fatal("default index cmd is empty")
+	if !strings.Contains(opts.IndexCmd, "kb/index") {
+		t.Fatalf("default index cmd = %q, want kb/index", opts.IndexCmd)
+	}
+	if !strings.Contains(opts.IndexCmd, "--with-mail") {
+		t.Fatalf("default index cmd must include --with-mail, got %q", opts.IndexCmd)
 	}
 }