- Scoped Anthropic provider session state by base URL and model so strict-tools/fast-mode fallback state no longer leaks across unrelated endpoints or models, and fast-mode re-arming clears all matching scoped entries.
- Dropped stale strict fallback error messages after successful retries and only enabled adaptive thinking display for models that advertise support, avoiding unsupported-model 400 errors.
- Updated idle stream iteration to close the upstream iterator on non-continuing exits (including consumer early break) and added coverage for upstream closure behavior.
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