Recover PR readiness worker dispatch #401
- MA
## Why
The live #372 retry exposed that the existing maintenance token cannot dispatch Actions workflows. The coordinator reserved an attempt, but no worker run appeared. PR #372 was not changed.
## Change
- Use the coordinator's built-in `GITHUB_TOKEN` to dispatch workers and CI. The guarded worker still uses the maintenance token only to publish validated PR updates. - Let an authorized manual retry replace a reservation after five minutes when recent worker-run discovery finds no matching run. A discovered running worker retains its lock; ordinary abandoned reservations still expire after 45 minutes.
## Verification
`bun test scripts/pr-maintenance`, `bun run ci`, `bun run types`, and `gh aw compile pr-readiness-worker` pass.
## Recovery flow

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