Update night 2026-09-21: Phase 0 and Phase 1 evidence, the drill method, and two instrument fixes

INTERIM CHECKPOINT — evidence off the machine at the end of the phase that produced it (R-320),
not at the end of the session. Phases 2-5 follow in a later commit.

Phase 0, all three mechanisms proven with their controls:
- the fleet floor to 0.261.0 with its declared MinAgent — both demo boxes in 13 s, the hub
  logging `managed floor SERVED ... from declared (golden 0.258.0)`.
- a PRIVATE DRILL CATALOG (admin/app-catalog-drill), so that broken, dummy, cross-repo and
  engine-major edges can be measured without the live catalog ever carrying one. Positive
  control quoted, and two negative controls: the live catalog's main and both real boxes'
  caches unchanged.
- a throwaway image store on the scratch guest, which is what makes an UNATTENDED HOLD
  measurable at all: an edge that PASSES the within-a-major test and still fails.
  CompareImageRefs was proven to order host:port/ references by RUNNING it (4 positive cases
  + 1 negative control), not by reading it.

Phase 1: real within-a-major upstream edges walked on guest 9202 through the product's own
guarded Update, each app seeded and read back through its OWN front door (R-156), with a
per-edge verdict record in 09's shape. `inconclusive` is never collapsed into `failed`.

TWO INSTRUMENT FIXES, both in this repo's own evidence code:
- 00-api-recipe.md said the app page is /app/<n>; it is /apps/<n>, and every call it described
  404s. Corrected, with the session-expiry note that cost the same time.
- unattended-caller.py's follow() read update_phase/updating off the API ENVELOPE, so both were
  always None and EVERY followed update ran to its 900 s timeout and was then recorded
  `timeout` and never-press-again. Fixed before B1 relied on it. R-623.

No controller, agent or hub code was written. The live catalog carries no broken reference.

Gates: repo_gates.py --fast — all 15 OK, exit 0.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

documentation/audits/update-night-2026-09-21/apps/tandoor/log.txt

@@ -0,0 +1,6 @@
+20:54:08 ==== tandoor: ghcr.io/tandoorrecipes/recipes:2.6.13  ->  ghcr.io/tandoorrecipes/recipes:2.6.15   (sub=recipes, class=db-postgres)
+20:54:08   [1] tandoor already deployed — reusing
+20:54:11   [2] seeding through the app's own front door
+20:54:13     tandoor: createsuperuser :: Traceback (most recent call last): File "/opt/recipes/manage.py", line 8, in <module> from django.core.management import execute_from_command_line ModuleNotFoun
+20:54:15     tandoor: the account did not appear in the app's own ORM :: aceback (most recent call last): File "/opt/recipes/manage.py", line 10, in <module> raise ImportError( ...<3 lines>... ) from exc ImportError: Couldn't import Django. Are you sure it's installed and 
+20:54:15   [9] verdict inconclusive  -> /mnt/5_hdd/felhom.eu/git/felhom.eu/documentation/audits/update-night-2026-09-21/apps/tandoor/verdict.json