v0.2.1

Fixed

• Detail commands (track, album, playlist, album tracks, playlist tracks, track features) now accept full Spotify URIs — previously only bare IDs worked, and URIs caused a 400 error.
• queue add validates malformed spotify: URIs client-side instead of leaking API 400/500 errors.
• Flag parser correctly handles negative numbers with space syntax (e.g. --limit -5 now errors instead of silently corrupting the query).
• shuffle, repeat, and top commands use INVALID_ARGUMENT error code when a value is provided but not valid (was MISSING_ARGUMENT).
• Unknown subcommands (e.g. auth blah) now return an error instead of silently showing subcommand help with exit 0.
• --help after the -- separator is treated as a literal positional argument, not a help trigger.