Integration fix 2: conditional recipe repairs and no pasted links in logs (Feature 12 review F1, F2) (#96)

Co-authored-by: orchestrator-agent <20+orchestrator-agent@code.cubecraftcreations.com>

docs/ARCHITECTURE.md

@@ -250,7 +250,16 @@ automatic** (D-021).
   `search_failed` / `ai_failed` (only the reason code is logged, never the
   provider's text), and grounding a candidate or link that runs past 90
   seconds (fetch, photo and `normalize_recipe`, all in the request) 504
-  `ground_timeout`, leaving the dinner unchanged.
+  `ground_timeout`, leaving the dinner unchanged. An archived dinner is 409
+  `dinner_archived`. A candidate or link is written only if the dinner is
+  still as it was before grounding began: one renamed or grounded some
+  other way meanwhile is 409 `ground_conflict`, and one archived meanwhile
+  409 `dinner_archived`, either leaving the dinner unchanged. A method,
+  minutes or difficulty a member edits meanwhile is kept over the recipe's.
+  Any other failure grounding a candidate or link, or recording it on the
+  dinner, is 500, logged with a fixed reason and the dinner id only —
+  never the link, which can carry a personal token, or dependency error
+  text.
 - `/health` — liveness.
 - Everything else serves the embedded PWA with SPA fallback.