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music-config has a large sibling-test fleet for the pure helpers; the gap was a handful of small dispatchers and assertion guards.
13 new tests, EMMS primitives stubbed throughout:
- `cj/music--assert-m3u-files-exist`: passes a non-empty list through, errors on empty.
- `cj/music--sync-playlist-file`: sets the buffer-local file ref + resets point.
- `cj/music--select-m3u-file`: returns the chosen path, returns nil on Cancel, errors when no files exist.
- `cj/emms--setup`: no-ops when emms already loaded, requires when absent.
- `cj/music-playlist-clear`: stops playback, clears the playlist, nils the file ref.
- `cj/music-add-directory-recursive`: calls `emms-add-directory-tree` for an existing dir, user-errors for non-dirs.
- `cj/music--find-track-in-playlist`: returns the buffer position when present, nil when absent.
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