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Split credential/quota.rs into quota/{mod,snapshot,recovery}.rs with
corresponding test modules. Snapshot aggregation is snapshot-level:
top-level limit_reached/allowed and any window used>=100 count as
exhaustion, scheduling signals survive limit-only windows, and window
rolling is O(1) arithmetic.
402 recovery uses the pre-write confirmed reset (old reset elapsed plus
fresh snapshot not exhausted, or explicit allowed=true) instead of the
new snapshot's future reset, fixing the worker recovery deadlock.
Scheduling projection TTL is capped at the nearest active reset so
cache expiry never outlives the limit.
Admin derives seven mutually exclusive statuses (Active/RateLimited/
QuotaExhausted/Expired/Invalid/Disabled/Banned) from availability plus
snapshot-level quota.limitReached; Unknown maps to invalid. Dashboard
metrics are mutually exclusive (rate_limited disjoint from active),
ignore reset-expired windows, and cover additional rate limits.
xAI: bare 402 writes a short account cooldown instead of persisting
QuotaExhausted; ModelQuotaExhausted keeps model scope; runtime cooldown
survives credential rotation; account deletion clears all account and
model-scoped cooldown keys via new ProviderCooldownPort::clear_all.
Migration 0002 is frozen in the sha256 manifest.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>