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* refactor(scanner): make tag value splitting position-based Replaces the ZWSP substitution trick with index-based cutting, in preparation for artist split exceptions, which need match positions. * feat(scanner): protect whitelisted names in tag value splitting Separator matches inside word-bounded exception matches no longer split. Matching is case-insensitive and longest-first; boundaries are rune-aware. * feat(scanner): add Scanner.ArtistSplitExceptions config option * feat(scanner): honor artist split exceptions for participant tags Applies Scanner.ArtistSplitExceptions to artist, albumartist and role tag splitting. Generic tags (genre, mood, ...) are unaffected. * fix(scanner): apply split exceptions when per-tag Split overrides participant tags Per-tag Tags.<name>.Split makes the generic ingestion path split the tag before participant mapping runs, bypassing the whitelist. Attach the exceptions to participant tag mappings (including sort variants) in clean(). * feat(scanner): split performer names and honor split exceptions Performer pair values were never split; multiple names in one PERFORMER value stayed a single artist. Split them with the roles separators, using the same whitelist protection as other participant tags. * test(scanner): lock MBID ordering for split performer values * refactor(scanner): consolidate split-exception wiring and drop hot-path lock ArtistSplitExceptionsRx is called per tag mapping per scanned file across concurrent goroutines; replace the mutex+joined-key cache with an atomic pointer compared via slices.Equal. Route all participant call sites through WithParticipantExceptions and a shared splitParticipantValues helper. * refactor(scanner): unexport artistSplitExceptionsRx All external callers go through WithParticipantExceptions, so the accessor does not need to be part of the model package API.