codexloop-quota-and-capacitylisted

# codexloop quota and capacity `QuotaExhausted` is a billing wall with no `resets_at` — it is **never waitable** and always needs a human to top up. Rate-limit windows *are* waitable. ## CapacityState variants ```python Available # green light ThrottleExhausted # retry_after: timedelta | None WindowExhausted # resets_at: datetime | None, window: str QuotaExhausted # reason: str — TERMINAL, never waitable AuthFailed # reason: str — TERMINAL TransientBackendError # retry_after: timedelta | None ``` `is_waitable(state)` returns `False` only for `QuotaExhausted` and `AuthFailed`. ## Body-first classification `classify(signals)` in `domain/classify.py` maps `TurnSignals` to a `CapacityState` using this ladder: 1. **Body wins.** `error.code` / `error.type` outrank HTTP status. 2. Auth: `error.code` / `error.type` in `ErrorClass.AUTH`, or status 401 → `AuthFailed`. 3. Quota: `error.code` / `error.type` in `ErrorClass.QUOTA` → `QuotaExhausted` (terminal). 4. Window: `ErrorClass.WINDOW` → `WindowExhausted` with `resets_at` from plan windows. 5. Throttle: `ErrorClass.THROTTLE` → `ThrottleExhausted` with `retry_after`. 6. Transient: `ErrorClass.TRANSIENT` or status 5xx → `TransientBackendError`. 7. Status 429 with no body marker → `WindowExhausted(resets_at=None)`. 8. Fallback: `Available`. High `used_percent` never outranks a billing marker. Completion claims never outrank capacity rejection.