MIDI Map

Map a hardware MIDI controller's knobs + faders onto any node's PARAMETERS — "MIDI learn", kernel-owned. A binding is a tiny line of the app's DSL: `$lead.cutoff = $value`, where `$value` is the live knob (0..1) the kernel maps onto the param's range (log-aware — exactly like dragging the dial). The bindings live on this node and save with the project; CC handling is audio.js runtime I/O, but every binding + its resolution is the kernel's. A controller of params (no sound of its own). The device picker + a bindings editor land in a later slice; for now bindings are added via add_midi_binding.

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