feat: symusic consolidation + pianoroll UI + route 404 fix - #120

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feat/symusic-consolidation

May 29, 2026

Commits on May 29, 2026

refactor(backend): migrate sample_synthesis.write_midi to symusic

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refactor(backend): migrate research MIDI parsers off pretty_midi to symusic

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docs(backend): drop PR-E (symusic-beat 4th method) — out of scope

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feat(backend): add symusic.Synthesizer audio path with env-flag backend select

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refactor(backend): drop pretty_midi + mido, complete symusic consolidation

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fix(backend): address PR-F gaps surfaced in honesty pass

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feat(ui): add transcription pianoroll heatmap to Session Musician suite

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fix(backend): read transcriptionDetail unwrapped in pianoroll route

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test(backend): add FluidSynth vs symusic synth parity probe

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test(ui): add transcription pianoroll smoke coverage (PR-B)

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