crucible depot: Increment 1 core (status/push/verify/get/pull + local/cdn/bunny backends) (#30)

Implements Increment 1 of `docs/superpowers/specs/2026-07-04-crucible-depot-core-design.md`: a new stdlib-only `internal/depot` package wired into the dispatcher.

- `crucible depot status|push|verify|get|pull` with backends `local`/`cdn`/`bunny`; exit contract `0` clean / `1` drift / `2` unconfirmed-only / `64` usage / `70` internal.
- Presence is always probed against the real target (IPv4 1-byte range GET; HEAD is banned with a regression-tripwire test). `unconfirmed` is a distinct state, never collapsed into `missing`.
- No prompting anywhere: missing `BUNNY_STORAGE_*` env fails closed (read path included), enforced by a no-stdin test.
- Uploads: probe-then-PUT with `Checksum: <UPPER-sha>`; read/write key split (`BUNNY_STORAGE_READ_PASSWORD` falls back to `BUNNY_STORAGE_PASSWORD`).
- Field-driven fix included: per-probe transient retry (curl `--retry 2` equivalent) — without it a real 1490-blob CDN sweep reported 1222 false-unconfirmed; with it, 1490/1490 present in 74s, exit 0.
- Registry: depot `Wired: true`, joins the interactive menu; stale "(SeaweedFS)" wording removed.

Tests: unit + httptest fake-Bunny (probe sequence, Checksum header, key split, 428 throttling → exit 2) + local→bunny integration (drift → push → clean → idempotent no-second-PUT; incremental pull). `make check` green.

**Merge ordering:** this merges FIRST; the companion `sow-assets-manifest#crucible-depot-cutover` PR needs its flake input bumped to include this.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: #30
Reviewed-by: xtul <mpiasecki720@protonmail.com>
Co-authored-by: vickydotbat <vickydotbat@tutamail.com>
Co-committed-by: vickydotbat <vickydotbat@tutamail.com>

internal/dispatch/dispatch.go

@@ -5,8 +5,10 @@
 // Cutover state (Phase 5 → 6): the internal pipeline/topdata/erf/wiki
 // packages migrated from gitea/sow-tools now live in this tree, so wired
 // builders delegate to internal/app's legacy command surface (mapped per
-// docs/command-surface.md). A builder with no migrated logic yet (depot) keeps
-// the Wired=false fail-closed path: exit 70, never a faked artifact.
+// docs/command-surface.md). depot is wired but bypasses that legacy surface
+// entirely, delegating straight to internal/depot.Run. A builder with no
+// migrated logic yet keeps the Wired=false fail-closed path: exit 70, never a
+// faked artifact.
 package dispatch
 
 import (
@@ -16,6 +18,7 @@ import (
 
 	"git.westgate.pw/ShadowsOverWestgate/sow-tools/internal/app"
 	"git.westgate.pw/ShadowsOverWestgate/sow-tools/internal/buildinfo"
+	"git.westgate.pw/ShadowsOverWestgate/sow-tools/internal/depot"
 	"git.westgate.pw/ShadowsOverWestgate/sow-tools/internal/menu"
 )
 
@@ -90,8 +93,15 @@ var Registry = []Builder{
 	{
 		Name:    "depot",
 		Bin:     "crucible-depot",
-		Summary: "verify/move content-addressed depot blobs (SeaweedFS)",
-		Wired:   false, // no migrated logic yet; fails closed (exit 70)
+		Summary: "content-addressed asset depot (local/cdn/bunny)",
+		Commands: []Command{
+			{Name: "status", Summary: "report referenced-vs-present drift against a backend", Usage: "crucible depot status [--manifests DIR] [--source DIR] --target bunny|cdn|local"},
+			{Name: "push", Summary: "upload referenced-but-absent blobs from a local depot", Usage: "crucible depot push [--manifests DIR] --source DIR --target bunny"},
+			{Name: "verify", Summary: "existence sweep plus sampled download re-hash", Usage: "crucible depot verify [--manifests DIR] --target bunny|cdn [--sample N]"},
+			{Name: "get", Summary: "fetch one blob with sha re-verify", Usage: "crucible depot get <sha> <dest> --target cdn|bunny|local"},
+			{Name: "pull", Summary: "incremental verified pull of every referenced blob", Usage: "crucible depot pull [--manifests DIR] --dest DIR --target cdn|bunny"},
+		},
+		Wired: true,
 	},
 	{
 		Name:    "hak",
@@ -365,6 +375,12 @@ func runBuilder(name string, args []string, out, errw io.Writer) int {
 			return exitOK
 		}
 	}
+	if b.Name == "depot" && b.Wired {
+		// depot parses its own subcommand (status/push/verify/get/pull) and
+		// has its own richer exit contract (0/1/2/64/70), so it bypasses the
+		// b.Commands/delegateLegacy routing entirely.
+		return depot.Run(args, out, errw, os.Getenv)
+	}
 	if !b.Wired {
 		// No migrated logic yet (depot): fail closed, never fake an artifact.
 		fmt.Fprintf(errw, unwiredMsg, b.Name, b.Bin)