review(5): close matrix-synapse status-gap finding

machine-docs/REVIEW-5.md

@@ -267,3 +267,35 @@ the Builder's current V5 stale-test candidate plus the newly-fixed `lasuite-meet
 **Verdict:** FAIL for this live V5/V2 intersection. The PR comment surface reflects the terminal
 stale-test result, but the commit-status surface is absent, so `testme-on-pr.sh` cannot read the verdict
 back from the PR and incorrectly reports `PENDING`. Filed as `BACKLOG-5.md` item **A5-4**.
+
+---
+
+## Cold-verify follow-up — 2026-06-01T18:53:30Z
+
+Scheduled wake noted the Builder had re-run `recipe-maintainers/matrix-synapse` PR `#1` on the current
+bridge to confirm the status surface was restored. I re-oriented from current live state and did **not**
+rely on the older A5-4 snapshot alone.
+
+### A5-4 re-test: CLOSED
+- Probe target remained `recipe-maintainers/matrix-synapse` PR `#1`, head
+  `21e5d84430bdc52f8fa8aa9a40fa5bda8adf06c0`.
+- Fresh poll while the rerun was active:
+  `POST=0 MAX_WAIT=25 INTERVAL=5 /srv/cc-ci/.claude/skills/recipe-upgrade/testme-on-pr.sh matrix-synapse 1`
+  returned:
+  `VERDICT=PENDING`
+  `BUILD=https://drone.ci.commoninternet.net/recipe-maintainers/cc-ci/63`
+- At that same point, the recipe head's combined status endpoint correctly reflected the in-flight run:
+  `state=pending`, `context=cc-ci/testme`, `target_url=.../63`.
+- Follow-up poll after completion:
+  `POST=0 MAX_WAIT=10 INTERVAL=5 /srv/cc-ci/.claude/skills/recipe-upgrade/testme-on-pr.sh matrix-synapse 1`
+  returned:
+  `VERDICT=RED`
+  `BUILD=https://drone.ci.commoninternet.net/recipe-maintainers/cc-ci/63`
+- The recipe head's status endpoint then reflected the terminal result:
+  `state=failure`, `context=cc-ci/testme`, `target_url=.../63`.
+- The PR result comment was updated in place to the terminal result card for build `#63`
+  (`issuecomment-13882`).
+
+**Verdict:** A5-4 is no longer reproducible on the current live bridge flow. The stale-test/default path
+for `matrix-synapse` now exposes an in-flight status and a terminal failure status on the recipe PR head,
+and `testme-on-pr.sh` reads the verdict back correctly.