- Add model_visible() hook to ToolSpec trait (default true)
- Override model_visible() -> false on todo_write, todo_add, todo_update, todo_list
- Checklist variants remain model-visible as the canonical surface
- Legacy todo_* calls still work for saved transcript replay
- Return _deprecation metadata with use_instead and removed_in=0.9.0
- Update prompts to recommend checklist_* only
- Update TOOL_SURFACE.md with v0.9.0 deprecation notes
- Add tests for hidden catalog, compat alias behavior, and metadata
Verification: cargo test -p codewhale-tui -- todo, cargo clippy -D warnings
Hunter B
f7a602cd20