v0.140.0: Claude Opus 4.8 and Gemini 3.5 Flash support, MCP tool search, incident response, and stability fixes

New features

- Claude Opus 4.8 - Added support for Claude Opus 4.8, including a faster Fast Mode variant
- Gemini 3.5 Flash - Added support for Gemini 3.5 Flash
- MCP tool search - Droid can now search and load MCP tools on demand, keeping large MCP setups fast and context-efficient
- Incident response - Droid can automatically investigate production alerts posted to a configured Slack channel and work toward a root-cause analysis

Improvements

- Accurate status banners - Spinner status banners now reflect the true state of the current turn
- Context menu text actions - Added text actions to the right-click context menu (app)

Bug fixes

- Terminal write errors - The CLI no longer crashes when the terminal rejects output writes
- Paste handling - Fixed a crash on certain pasted input and corrected handling of split bracketed pastes
- Agent loop stalls - The agent loop no longer runs unbounded when turns produce no output
- Empty chat placeholder - Restored the placeholder shown in empty chats (app)
- Machine connection crash - Fixed a crash when loading sessions with older machine connection types (app)