v2.0 — Consolidated toolkit

What changed

getMusic.py is now a single unified toolkit. The standalone extract_opus_art.py
and extract_mp3_art.py scripts are retired — their functionality lives in the
main script as --extractArt, with improvements.

New modes

• --testOpus — Opus file integrity checking via FFmpeg decode (same pattern as --testMP3)
• --extractArt — Extract embedded cover art to cover.jpg with format priority ranking (FLAC > Opus > M4A > MP3) and --dry-run support
• --missingArt — Report directories with no cover art (distinguishes "no art at all" from "embedded only")
• --duplicates — Detect same artist+album appearing across multiple directories or formats
• --auditTags — Report files missing title, artist, track number, or genre with a summary breakdown

Bug fixes

• Fixed cover.jpg collision — Cover detection is now case-insensitive. Running art extraction in a folder with both Opus and MP3 files no longer produces both cover.jpg and Cover.jpg.

Improvements

• Art extraction prefers front cover (type 3) over generic embedded images
• Art extraction supports four formats: FLAC, Opus/OGG, M4A, MP3
• Interactive menu updated with all eight modes
• All existing CLI invocations remain backward-compatible

Removed

• extract_opus_art.py (folded into --extractArt)
• extract_mp3_art.py (folded into --extractArt)