Three-state outcome per note: inserted (new id), skipped (id+rawText
match), forked (id match but rawText differs → new uuidv7 to preserve
raw_text invariant from slice §1.1). Media files copied into
MediaStore convention <profileDir>/media/{noteId}/{n}.{ext} with
new media DB rows.
NoteRepository.importNote handles full provenance: ai_status='done',
ai_provider, ai_generated_at, edited flags, intent fields, tags
with source preserved.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
