fix(bridge): ignore pre-start trigger comments

machine-docs/JOURNAL-cfold.md

@@ -343,3 +343,52 @@ Takeaways:
 - There is also likely a separate trigger dedupe problem: one `!testme` comment spawned runs `568`, `569`,
   and `570`. I did not broaden into a D1 investigation in this loop step because cfold M2 is already
   hard-blocked by Ghost's repeated upgrade failures, but the evidence is now recorded.
+
+## 2026-06-13 — Root-caused Ghost triple-trigger replay; bridge fix authored with unit coverage
+
+Pulled the Adversary's latest cfold audit (`review(cfold)` `ddefc96`). It was not an M2 verdict or a
+finding; it confirmed the sweep is still unclaimable while teardown remains clean (`live_pr_apps=0`).
+
+I then closed out the duplicate-run side observation from the Ghost PR #3 retrigger.
+
+Evidence:
+
+```bash
+$ ssh cc-ci 'docker logs --since "2026-06-13T00:07:30" --until "2026-06-13T00:08:30" c54c433972ac 2>&1'
+[poll] triggered build 568 for ghost@720faa0b (PR #3, comment 14029) by autonomic-bot
+[poll] triggered build 569 for ghost@720faa0b (PR #3, comment 14032) by autonomic-bot
+[poll] triggered build 570 for ghost@720faa0b (PR #3, comment 14497) by autonomic-bot
+
+$ ssh cc-ci 'docker service ps ccci-bridge_app --no-trunc'
+# single running replica only; no restart near the incident
+
+$ ssh cc-ci 'docker ps --format "{{.ID}} {{.Names}} {{.Status}}" | grep ccci-bridge || true'
+c54c433972ac ccci-bridge_app.1.u5msezm603izeyf7kizqxq97j Up 22 hours
+```
+
+Conclusion: this was NOT one comment id deduped incorrectly inside a single process. It was the poller
+correctly treating THREE distinct comment ids as unseen after PR #3 was reopened:
+
+- `14029` and `14032` were historical `!testme` comments from when PR #3 had been open earlier.
+- PR #3 was closed when the current bridge process started, so those comments were not covered by the
+  startup pass that marks pre-existing comments seen.
+- When PR #3 was reopened, the poller saw those old comments for the first time and replayed them, then
+  also processed the fresh comment `14497`.
+
+Repo fix authored:
+
+- `bridge/bridge.py`: added `_PROCESS_STARTED_AT` and `_is_preexisting_comment()` so the poller now marks
+  any trigger comment older than the current bridge process as already-seen, even if the PR was closed at
+  startup and only becomes visible later via reopen.
+- `tests/unit/test_bridge_trigger.py`: added focused tests for pre-start vs post-start comment handling.
+
+Verification:
+
+```bash
+$ nix shell nixpkgs#python311Packages.pytest -c pytest tests/unit/test_bridge_trigger.py -q
+..........                                                               [100%]
+10 passed in 0.04s
+```
+
+This fix addresses the replay hole exposed during cfold's Ghost retrigger. It does not change the cfold
+bottom line: Ghost's upgrade tier remains the lone M2 blocker, while custom discovery continues to pass.