[G-4-R-Y]

Adds an expressive piano/controller performance layer on top of Performance Director.

Highlights:

• dedicated Piano Performance / MIDI Keyboard feature in projection-ui
• piano mode keeps normal playing musical: pitch, velocity, attack strike, polyphonic density, register spread, chord family/tension, sustain/soft pedals, expression, aftertouch and bend continuously modulate shader + particle behavior
• optional low-key hot-cue zone, disabled by default
• beat/bar-quantized cue, journey and snapshot launches
• sparse cue-loop recording/replay in musical beats, rounded to full bars
• localhost browser dashboard with live cue/section/BPM/MADNESS/piano/loop state and direct controls
• outbound OSC live-state feedback
• optional CC-only MIDI feedback (no note-on messages)
• optional Ableton Link clock adapter via aalink 0.2.3, kept out of default desktop bundles because aalink is GPLv3+
• frozen-app self-test coverage for piano/timing/dashboard modules and one-click Piano Performance registry
• deterministic tests for sustain latching, chord tension, velocity strike decay, quantization, looping, piano MIDI mode, MIDI feedback and Link clock interpolation

Default desktop artifacts remain independent of aalink; install .[link] explicitly for Link sessions.