v0.171.0: MCP connect timeouts, theme detection over SSH, and mission, model, and notification fixes

- Context usage on resume - Context usage now displays immediately when you resume a session
- Windows installer architecture - The CLI installer now detects the native Windows architecture

Bug fixes

- MCP connection timeout - stdio MCP servers now time out on connect instead of hanging
- Grep and Glob timeouts - Grep and Glob timeouts now surface as actionable errors
- Theme detection over SSH - Fixed theme auto-detection over remote terminal sessions
- Todo status colors - Todo status colors now render correctly
- Completion notification - The turn-completion notification now fires before the CLI exits
- Subagent reports - The end-of-turn todo reminder no longer swallows subagent reports
- Mission settings - Fixed updating mission settings in the desktop app (app)
- Mission notifications - Mission mode now fires audio and badge notifications (app)
- Model defaults - Model defaults now persist correctly (app)
- Reasoning tooltip - The reasoning tooltip now dismisses when you start typing (app)
- Local storage failures - The app no longer breaks when local storage is unavailable (app)