Repair Partitura's real MusicXML-to-MIDI pipeline for malformed chord anchors, empty scores, one-shot…

Repair Partitura's real MusicXML-to-MIDI pipeline for malformed chord anchors, empty scores, one-shot…: a task in MiMo-V2.6-RL-harbor-terminal: MiMo-V2.6-RL Terminal (Harbor) (Harbor dataset). Repair the frozen Partitura source tree in /app/vendor/partitura and produce /app/output.mid by running…