New editor-beta.html: a bidirectional live mirror over the existing USB-MIDI
SysEx channel (0x7D). Either the website or the device can edit grooves, change
tempo/volume, start/stop, or select set-list items, and the other reflects it.
- src/livesync.js: LiveSync layer (opcodes 0x40 HELLO / 0x41 FULL / 0x42 DELTA /
0x43 BYE) riding the existing _ensureMidi/_send/onDeviceMidi plumbing. Fine
deltas for transport/bpm/vol/sel/beat, coalesced full-state for structural
edits; echo suppression via origin + _applyingRemote guard; device-authoritative
heartbeat reconciles drift. ?loopback=1 self-test mode (no hardware needed).
- editor-beta.html: copy of editor.html + "Live sync" toggle, SysEx routing,
and broadcast hooks at each mutation choke point (guarded by _applyingRemote).
- docs/livesync-protocol.md: wire spec + firmware checklist for pico-cp/app.py
(firmware half owned by the other instance — editor side + spec only here).
- build.sh / deploy.sh: add editor-beta.html to the build + version-stamp loops.
Editor side only; pico-cp/app.py untouched.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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