test(state): prove MidiParameterMap maps any parameter with zero driver code

[shipyard-local]

Closes Phase-3 item #6 (hardware MIDI controller maps to any parameter with zero driver code).

Scope finding: already-satisfied (no-op-by-absorption)

MidiParameterMap (core/state/include/pulp/state/midi_parameter_map.hpp) is already fully general. It learns (arm_learn), maps (channel, cc) -> ParamID, and applies via handle_cc -> store.set_normalized_rt against any StateStore it is handed — not one plugin's params. kOmni channel, lock-free UI->audio SpscQueue, and the header documents the records-as-automation path. "Any parameter, zero driver code" (no per-controller/per-parameter code, only runtime learn/apply with opaque IDs) is already true.

The timeline layer is format-neutral: its document target is DeviceParameterTarget{device_placement_id, param_id} with no StateStore; resolving that target to a real parameter lives in core/playback (out of scope). A "document parameter" ultimately resolves to a placed device's StateStore param, which MidiParameterMap already drives. So there is no integration seam to add in core/timeline, and a timeline-level CC -> DeviceParameterTarget map would be dead code. The DoD just needs a proof.

What this lands

Two Catch2 cases in the existing owner file test/test_midi_binding.cpp (already registered as pulp-test-midi-binding); no production change:

• DoD proof — maps any parameter with zero driver code: registers a spread of arbitrary params, learns + drives each through one generic loop; also asserts per-parameter independence and unmapped-CC-ignored.
• Defensive — re-learn replaces an existing mapping: the previously-uncovered path where re-arming the same controller retargets it and the old parameter goes quiet.

Validation

pulp-test-midi-binding: 9 cases / 58 assertions green (Release). gates.sh origin/main clean; docs_noise_lint clean; version_bump_check --mode=report: no bump needed (test-only).

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_{stamped 2026-07-22 06:01 UTC}