What Happened
- This PR makes the Copilot model list authoritative to the live `/models` response so disabled or unavailable models no longer remain visible. It adds `filterModel` in `githubCopilotModelManagerOptions` to drop returned entries with `model_picker_enabled = false` or non-enabled `policy.state`, and introduces `dynamicIsAuthoritative: true` in `ModelManagerOptions` so `resolveProviderModels` discards bundled `models.json` entries absent from live data before merge and cache write.
- This PR makes the Copilot model list authoritative to the live `/models` response so disabled or unavailable models no longer remain visible. It adds `filterModel` in `githubCopilotModelManagerOptions` to drop returned entries with `model_picker_enabled = false` or non-enabled `policy.state`, and introduces `dynamicIsAuthoritative: true` in `ModelManagerOptions` so `resolveProviderModels` discards bundled `models.json` entries absent from live data before merge and cache write.
- 1 evidence item attached for review.