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Add a manual per-model "Context Window Override" so an operator can correct a provider's misreported context length (e.g. reports 1M when the real limit is 128K) instead of the model getting silently dropped from combo routing once the wrong value lands in the catalog. Reuses the existing Feature-5004 model_context_overrides table (source="manual") — already the priority-0 source getModelContextLimit() (the function combo's context-window filter calls) reads ahead of the models.dev/registry/static catalog — so no new resolver logic was needed, only the missing write path: - PUT /api/provider-models now accepts an optional contextWindowOverride (number to set, null to clear), persisted via setModelContextOverride/ removeModelContextOverride. - GET /api/provider-models surfaces the current override value + source back on each custom-model row. - CustomModelsSection.tsx: edit form gained a Context Window Override input + a badge on the model row when an override is set. Regression guard: tests/unit/provider-models-context-window-override-4125.test.ts (manual override wins over a misreported catalog value, GET round-trip, clearing via null, default-unchanged behavior).