- Added `parseClaudeRateLimitHeaders` to extract 5h/7d utilization from `anthropic-ratelimit-unified-*` response headers.
- Added `AuthStorage.ingestUsageHeaders` to warm the per-credential usage cache from headers, throttled to 60s per key.
- Merges header-derived limits onto the last full usage report, preserving per-tier data not present in headers.
- Wires ingestion into `AgentSession` on each Anthropic response to reduce direct OAuth `/usage` probes.