claim(3 U3): YunoHost-style PR comment LIVE on custom-html PR#2 (comment 13792) — 🌻 + level badge + summary card images linked, updates in place on re-!testme, no secrets; R2 satisfied

machine-docs/BACKLOG-3.md

@@ -41,9 +41,16 @@ Milestones U0–U5 (plan §5); each ends with an Adversary gate. DoD items R1–
       latest-level badge endpoint → U5.
 
 ### U3 — YunoHost-style PR comment  (R2)
-- [ ] U3.1 — Bridge posts a placeholder comment on run start (⏳ + live-logs link).
-- [ ] U3.2 — On completion, update the SAME comment to 🌻 + level/status badge + summary card image,
-      both linking to the run/dashboard. Re-`!testme` refreshes it. Fallback to text on render failure.
+- [x] U3.1 — Bridge posts a placeholder comment on run start (⏳ + live-logs link). `start_comment_body`,
+      reuses the marked comment if present (re-`!testme` refreshes to placeholder).
+- [x] U3.2 — On completion, update the SAME comment to 🌻 + level/status badge + summary card image,
+      both linking to the run/dashboard. Re-`!testme` refreshes it. Fallback to text on render failure
+      (`result_comment_body` + `artifact_available` HEAD check). Deployed (bridge img 6377f9571f3b).
+- [ ] U3.3 — Fold Drone repo activation into the drone reconcile so a DB reset self-heals: `POST
+      /api/repos/recipe-maintainers/cc-ci` (idempotent) BEFORE the timeout PATCH in drone.nix. Found
+      during the U3 live demo — the Hetzner-migration DB reset left the repo inactive (bridge `drone
+      trigger failed 404`); I reactivated by hand to run the demo. Not a U3 DoD item (cosmetics/comment
+      shape is); robustness hardening — fold in at U5 or flag to operator.
 - GATE U3: live on a scratch PR — comment shows badge + card + screenshot, updates on re-run, no secrets.
 
 ### U4 — Dashboard polish  (R5)