ci: re-pin PR Hygiene so the sweep reaches every pull request

[shumkov]

Re-pins the shared review workflow onto dashpay/stale_prs_are_bad#25.

The hourly sweep is what repairs a pull request whose events were missed — a run that failed, a webhook that never arrived, a state that drifted. Since the sweep moved from every fifteen minutes to hourly, its rotation cursor has been advancing four batches per sweep while covering one, because the cursor is read from the clock in 15-minute buckets. Where the number of open pull requests shares a factor with that overshoot, the skipped slices never come back round:

open PRs	ever swept, over ten days of hourly sweeps
8, 12, 24	6
48	12
30, 57, 65	all

The bucket now matches the cadence the sweep actually runs at, and the cadence is named rather than inlined so the two cannot drift apart silently again.

Nothing else changes: same triggers, same policy, same rules about who may approve and when a pull request is ready. The only line that differs is the pinned engine revision.

🤖 Generated with Claude Code

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[github-actions]

PR Hygiene

State: waiting-bots · commit dfedff50001b6723d3faca95ca018f3d8f0fb9cd

• thepastaclaw has not reported for the current head

Self-review is an author attestation that you have read the diff:
/self-reviewed — covers everything pushed so far; post it again after a new push.
Post it after this report appears for commit dfedff50001b6723d3faca95ca018f3d8f0fb9cd, or name the commit explicitly with /self-reviewed dfedff50001b6723d3faca95ca018f3d8f0fb9cd.

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[thepastaclaw]

🕓 Queued for automated review — 14th in line, estimated start in ~40 min (commit dfedff5)
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