ci: wake PR Hygiene only for a comment that can change the answer

[shumkov]

Re-pins the shared review workflow onto dashpay/stale_prs_are_bad#30, and narrows which comments start a run.

Every comment by either review bot used to start a full reconciliation. Measured over 75 recent pull requests:

	receipts via review	receipts via comment
coderabbitai	0	19
thepastaclaw	15	—

CodeRabbit never approves, so its comments must still be heard — but only for the two markers the engine reads: its completion receipt and its rate-limit notice. thepastaclaw always reports by review, which arrives on its own event, and nothing reads its comments at all; it posted them on 67 of those pull requests, each one a reconciliation over data no rule consults.

This costs latency and never correctness: comments are read from the pull request when a run happens, not from the event that started it, so a comment that starts no run is still seen by the next one and by the hourly sweep. Every trigger condition is a strict superset of the engine rule it guards.

Note for anyone reading the workflow: the two marker strings are generated from the engine's own constants rather than written out here, so they cannot drift apart.

No change to who may approve, when a pull request is ready, or what blocks it.

🤖 Generated with Claude Code

[coderabbitai]

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[thepastaclaw]

🕓 Queued for automated review — 16th in line, estimated start in ~4 h (commit bae1c41)
Estimated review time once started: ~35 min (two-phase automated review; median of recent runs).

• Request priority review — click to move this review to the front of the queue.