[andresbott]

Summary

Todo lists were persisted as markdown files, which made concurrent edits, stable item references and live reload fragile. Lists now live in a SQLite database, with items addressed by ID.

What

• Add a SQLite store with schema, transactional writes and a revision counter; newer schemas are refused.
• CLI commands use --id selectors, and a new import command (plus auto-import) converts existing markdown into the db, which is created only on the first CLI write.
• The TUI runs on the store and live-reloads when the revision changes, rebuilding the tree and reporting failures when a post-write reload fails.
• Markdown persistence and rendering are dropped; the parser remains for import only.
• Imports go through a temp file and hard link (falling back to rename), never removing the target, and the db gets mode 0644.
• Docs updated, with the design spec and plan added.

Notes

• Breaking: the markdown file is no longer the source of truth, so existing lists must be imported.