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Susana Ferreira
123c8dfc02
## Description Adds the `aibridge/keypool` package, a thread-safe key pool with per-key state tracking and cooldown expiry. This PR introduces the package only; wiring it into the aibridge providers and coder configuration will happen in upstream PRs. ## Changes Each key is in one of three states: **Valid** (available), **Temporary** (rate-limited with cooldown expiry), or **Permanent** (revoked/unauthorized, terminal until restart). The state is derived from the key fields rather than stored explicitly: once a cooldown expires, the key is valid again without any external action. A `Walker` provides per-request key traversal using a primary-with-fallback strategy: each request walks the pool from index 0, skipping unavailable keys, so the first key is always preferred when healthy. Walkers are independent, so concurrent requests traverse the pool without interfering with each other. `MarkTemporary` preserves the longer cooldown when concurrent requests both mark the same key. Relates to https://github.com/coder/internal/issues/1445 > [!NOTE] > Initially generated by Coder Agents, modified and reviewed by @ssncferreira