fix(review): rollout poll never gives up while the run is alive (Bugbot finding)

waitForRollout returned '' after ~30s of polling even with the review still running, permanently exiting the tailer — a rollout materialising late lost live tokens for the rest of a minutes-long run (the stdout per-turn fallback still delivered final counts, but no live movement). The poll now continues until the file appears or stop fires, debug- logging once past the expected-quickly window (the signature of a codex release changing the rollout layout) and backing off to a slower cadence so a missing file costs one cheap glob every ~2.4s.