- Added cell-by-cell Python execution tracking with duration and exit codes.
- Added template system with {{placeholders}} for task tool context rendering.
- Enhanced patch applicator to preserve exact indentation when intended.
- Changed Python tool to use cells array instead of single code parameter.
- Updated task tool schema to require vars instead of task field.
- Moved test files from src/core to test/core directory.
- Moved test files from src/core/tools to test/tools directory.
- Moved test files from src/discovery to test/discovery directory.
- Updated import paths to reflect new test file locations.
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