- Delete examples directory and its example action system
- Rename actions/ to legacy_actions/ and data/ to legacy_data/
- Update Cargo.toml license file reference
- Move setup scripts to scripts/dev/ directory
- Add todo.txt patterns to .gitignore

The add_mapping, move_mapping, and remove_mapping methods now directly
operate on LocalSheetData fields and maintain the vfs HashMap. The
LocalSheet wrapper methods delegate to LocalSheetData.

This centralizes mapping logic and ensures vfs is updated when mappings
change.

Introduce AnalyzeResultPure struct to hold owned data, separating it
from the borrowed lifetime in AnalyzeResult. Provide From conversion
to enable easy transformation between the two types.