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Add the three OPTIONAL per-note feedpak 1.5.0 teaching marks — fg (fret-hand finger), ch (strum-group key), sd (scale degree) — to the Note model and wire format, mirroring the bend-shape work (#531). These are DISPLAY/TEACHING ONLY: nothing in the scoring / note-verification path reads them. - lib/song.py: Note.fret_finger / strum_group / scale_degree, default-omitted on the wire (fg/ch/sd) and decoded via _wire_int_optional; _parse_note reads the GP-written fretFinger XML attr. Pure helpers key_to_tonic_pc (§7.7 key name -> tonic pitch class) + scale_degree_for_pitch, plus base_open_string_midis / pitch_from_base / note_pitch_midi (tuning offsets + capo + fret -> MIDI, mirroring app.js _TUNING_BASE_MIDI). - lib/gp2rs.py: GP5 note.effect.leftHandFinger -> fg (RsNote field + fretFinger XML attr), reusing the chord Fingering value convention. - lib/gp2rs_gpx.py: GP8/GPIF per-note <LeftFingering> (p-i-m-a-c letter codes, verified against real GP8 exports) -> fg. - server.py highway_ws: derive sd for notes + chord notes from the active keys.json key + sounding pitch when the author didn't author one (author value wins); base hoisted out of the per-note loop. Tests: round-trip + omit-when-default + malformed-tolerance for fg/ch/sd; key_to_tonic_pc + scale_degree_for_pitch + note_pitch_midi (standard/drop-D/ capo/bass) units; GP5 leftHandFinger and GP8 <LeftFingering> import. Part of got-feedback/feedback#334 Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>