- `ci_fix_check_and_increment` now accepts an optional `check_only` arg:
- count < 3, check_only: returns `ok:N` without incrementing (deferred
to launch time, preserving the WAITING_PRS protection)
- count < 3, non-check_only: increments and returns `ok:N` (unchanged)
- count == 3 (any mode): atomically bumps to 4 and returns
`exhausted_first_time:3` — only one concurrent poller can win this
- count > 3 (any mode): returns `exhausted:N` with no write
- `handle_ci_exhaustion` unified to a single code path for both
check_only and non-check_only:
- Writes escalation JSONL + matrix_send only when sentinel is
`exhausted_first_time` — never on a bare integer comparison outside
a lock
- Removes the two separate `ci_fix_increment` bump-to-4 calls that
were racy (the sentinel bump is now inside the flock in Python)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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