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Add a 'Context Window' sidebar view showing the live context occupancy
(latest request's input+output) against the model's maximum context
window, resolved dynamically from the models.dev catalog.
- core: models.dev catalog module (resolveContextLimit) with disk cache,
TTL, stale-fallback + offline penalty memo; null for unknown models.
- api: GET /models/context-limit?provider=&modelId=.
- frontend: ContextWindowPanel + computeContextUsage helper; App resolves
+ caches the active model's max (anthropic/opencode-anthropic only);
percent shown to 2 decimals; degrades to bare token count when max
unknown.
- tests: core catalog (13), api route (3), frontend helper (6).
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