- Replace overly broad .includes('anthropic') with exact provider ID
matching against known Anthropic providers (anthropic, google-vertex-
anthropic, aws-bedrock-anthropic) in context-limit-resolver
- Add afterEach cleanup for vision-capable-models cache in look-at
tool tests to prevent cross-test state leakage
- New context-limit-resolver.ts with resolveActualContextLimit() shared helper
- Anthropic provider detection now uses .includes('anthropic') instead of hard-coded IDs
- Both context-window-monitor and dynamic-truncator use the shared resolver
- Added missing test cases: Anthropic+1M disabled+cached limit, non-Anthropic without cache