Task board: Round 18 section, equalizer parked with design note

CLAUDE.md's never-move rule rewritten for the Round 18 rename-move
feature; TASKS.md New backlog folded into a checked-off Round 18
section (plus trav's by-eye verify list). The equalizer item moves to
Parked/deferred with trav's bass/mid/treble idea and the QMediaPlayer
no-effects-hooks blocker recorded.

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

CLAUDE.md

@@ -110,8 +110,13 @@ persistence) → GUI (Qt widgets that read the manager and connect to its signal
   own child-widget overlay instead. `QAudioOutput` must not be constructed before
   a `QMainWindow` exists (Qt 6.10 deadlock). Some PyQt signal relays need explicit
   types/lambdas.
-- **Never move or rewrite the user's music files** except deliberate tag edits
-  via `tagging.py`. The library JSON is the source of truth for everything else.
+- **Music files are only touched deliberately:** tag edits via `tagging.py`,
+  and — since Round 18 — artist/album_artist/album edits relocate the file
+  inside `LibraryManager.organize_root()` (`<music_folder>/Music`) to keep the
+  tree organized iTunes-style (`_maybe_move_file`; undoable; files outside the
+  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.
 - `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.