docs(07): verify phase after the avatar bucket gap close

Assembled avatar POST is 200. UAT is 12/12. AUTH-02 through AUTH-04
and I18N-02 are marked complete. Do not auto-advance.

Co-authored-by: Cursor <cursoragent@cursor.com>

.planning/debug/resolved/avatar-bucket-not-published.md

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+# DEBUG: Avatar upload 500 on assembled app
+
+**Discovered:** 2026-09-23 during `$gsd-verify-work 7`
+**Status:** diagnosed
+**Goal:** find_root_cause_only
+
+## Symptoms
+
+- POST `/_user/api/v1/avatar` with a JPEG multipart against `app.Handler` returns `500 {"error":true,"message":"Internal server error"}`
+- Profile update, marketing consent, and change-password on the same handler succeed
+- `TestUploadAvatar` / `TestRemoveAvatar` pass
+
+## Reproduction
+
+1. Boot `app.Handler` with parity `testConfig` (app.yaml + http.yaml + JWT secret)
+2. Register, then `curl -F avatar=@tiny.jpg`
+3. Observe 500
+
+## Root Cause
+
+Phase 5 shipped `attach.OpenBucket` / `attach.Publish` but never called them from serve. Phase 5 verification recorded that as info because there was no HTTP upload yet. Phase 7 added `UploadAvatar`, which does `app.Lookup[*blob.Bucket]()` and `writeOpaque500` when the lookup fails.
+
+Neither boot path publishes the bucket:
+
+- `fonoteka.go/app/app.go` `Handler` — `lagoon.Publish` then `party.Activate` then `surf.Assemble`
+- `surf.ServeCommand` — `lagoon.OpenFromApp` / `lagoon.Publish` then `Assemble`
+
+Unit tests call `publishAvatarBucket` (memblob) themselves. The ported parity fixture is `avatar-missing` (JSON `{}` → 422), so `TestParityCorpus` never uploads a file.
+
+## Suggested Fix
+
+1. Open and publish the bucket next to `lagoon.Publish` in `ServeCommand` and `app.Handler`. Empty `storage.uploads.bucket_url` already fails loud.
+2. Set `storage.uploads.bucket_url=mem://` on assembled-test configs.
+3. Add a Handler-level multipart upload test so this cannot regress behind the 422 fixture.