Remove created_at/updated_at from Task struct and frontmatter. Add a
version counter (u64) that increments on every write, defaults to 1 for
old files. list_tasks now groups by UUID and auto-deletes stale
duplicates (keeping highest version), preventing sync-induced dupes from
surfacing in the UI. has_time and parent are omitted from frontmatter
when false/null.
Update CLI, Tauri frontend types, and Svelte components to match.
Add rollback to move_task: if delete-from-source fails after write-to-
destination, clean up the duplicate. Reject list names with path separators
or '..' to prevent traversal; canonicalize() failures now return errors
instead of silently falling back to unchecked paths. Add validation and
rollback to CLI workspace migration: check destination is empty, track
moved files, and reverse on failure.
Add TaskRepository::move_task() to move tasks between lists and
rename_list() to rename lists on the filesystem. Adds rename_list
to the Storage trait with FileSystemStorage implementation.
Includes tests for both operations plus duplicate-name error case.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Tristan Michael