Task board: Round 19 section; versioning convention in CLAUDE.md

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

CLAUDE.md

@@ -117,6 +117,15 @@ persistence) → GUI (Qt widgets that read the manager and connect to its signal
   root are never moved; the new path syncs cross-machine via the `location`
   newest-wins merge in `conflict_resolver`). Nothing else may move or rewrite
   music files. The library JSON is the source of truth for everything else.
+- **Versioning & self-update:** `__version__` in `lintunes/__init__.py` is
+  the single source of truth (`setup.py` regex-reads it, never imports the
+  package). Claude bumps minor for feature rounds and patch for fix-only
+  rounds as part of each round's final commit; trav decides major bumps. The
+  status-bar version button (`gui/version_button.py` + `lintunes/updater.py`)
+  checks `origin` shortly after launch and every 4 h, and a click runs
+  `git pull --ff-only` then re-execs the app — pushing `master` is
+  effectively releasing to the other machines (a new pip dependency still
+  needs a manual `pip install -e .` there).
 - `scripts/` holds one-off maintenance tools (`audit_artwork.py`,
   `recover_artwork.py`, `clear_computed_ratings.py`) run manually against a data
   dir; most default to dry-run and need `--write` to mutate files.