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

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/brain/stats.go

@@ -0,0 +1,20 @@
+//usr/bin/env go run -tags=brain_stats "$0" "$@"; exit
+//go:build brain_stats
+//
+// bin/brain/stats.go - index health.
+//
+//	./bin/brain/stats.go
+//	./bin/brain/stats.go --json
+//
+// NOTE: never run `gofmt -w` on this file — it breaks the shebang.
+package main
+
+import (
+	"os"
+
+	"github.com/eSlider/2dph/internal/cmdbin"
+)
+
+func main() {
+	os.Exit(cmdbin.ExecFile("bin/kb/stats", os.Args[1:]))
+}