- ratelimit.py: exempt /v1/video, /v1/audio and /v1/loras progress polls from
  BOTH auth and rate limiting (shared _PROGRESS_PATHS), matching /v1/images.
  The township script polls /v1/video/progress ~1/s during a clip; being
  rate-limited, those polls ate the budget so the generation POST got 429'd
  (clip failed) and the polls themselves 429'd (stuck step bar).
- township _render_once: a 429 now backs off and retries the same render (up to
  40 attempts, capped 60s) instead of abandoning the clip; covers clips,
  chained parts and outcomes. Genuine errors still fail fast.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>