- Added environment variable management via settings.json with applyEnvironmentVariables() and related methods.
- Enhanced file mentions to support directories, validate boundaries, and truncate large files.
- Added fallback model candidate logic in title generator to retry on model failures.
- Fixed bash output preview to minify JSON content and skip structural-only lines.
- Added Cerebras provider support with thinking block filtering and zai-glm-4.6 model priority.
- Refactored tree rendering to use consistent theme.tree properties instead of boxSharp.
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