docs: record post-S-VIEW DAW-fix pass + voice-system redesign (parameterized voices, mono, preview card, two-tier panic, v7)

CLAUDE.md

@@ -4,7 +4,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 ## Repo identity and current state
 
-**ReaSampler** is a per-project audio sample-bank capture tool that builds two artifacts: the REAPER extension (`reaper_reasampler`) and **ReaSampler 9000**, a Windows-only VST3 sampler instrument (`reasampler_9000.vst3`, `src/vst/`, second CMake target `reasampler_vst`, gated on the vendored `vendor/vst3sdk` submodule slice). The pure-testable-core / REAPER-facing-shell discipline is preserved throughout. CONTEXT.md is the authoritative spec — settled decisions, invariants, guardrails, and not-yet-built specs; it is large, so locate the relevant phase section by grepping its headings and read only that section with an offset rather than reading it whole. Build detail for landed phases lives in CONTEXT-ARCHIVE.md. Every REAPER API name cited there is correct-by-intent; verify argument order, types, and flag values against `vendor/reaper-sdk/sdk/reaper_plugin_functions.h` before use.
+**ReaSampler** is a per-project audio sample-bank capture tool that builds two artifacts: the REAPER extension (`reaper_reasampler`) and **ReaSampler 9000**, a Windows-only VST3 sampler instrument (`reasampler_9000.vst3`, `src/vst/`, second CMake target `reasampler_vst`, gated on the vendored `vendor/vst3sdk` submodule slice). The pure-testable-core / REAPER-facing-shell discipline is preserved throughout. CONTEXT.md is the authoritative spec — settled decisions, invariants, guardrails, and not-yet-built specs; it is large, so locate the relevant phase section by grepping its headings and read only that section with an offset rather than reading it whole. Build detail for landed phases lives in CONTEXT-ARCHIVE.md. Every REAPER API name cited there is correct-by-intent; verify argument order, types, and flag values against `vendor/reaper-sdk/sdk/reaper_plugin_functions.h` before use. A post-S-VIEW DAW-fix pass has landed (all 52 suite tests green): envelope nodes fully editable in both modes (every Gate stage A/H/D/S/R + Trigger zero-fade-out node, param-domain schematic scaling, 8 px min node separation, all nodes clamped in-canvas); gap-free per-column waveform render (`columnMinMax` homed in `peaks`, `waveformColumnCount` in `component_geometry`, shared via `drawWaveform`); `param_slider` `Knob` primitive (7→5 o'clock arc, needle, vertical-drag); zone-bleed fix 3a (`reconcileSingleCaptureZones` in `sample_map`). The voice-system redesign is also landed: `sampler_core` gains user-parameterized voice count (1–32, default 16), `VoiceMode` Poly/Mono (last-note held-note stack, `MonoTrigger` retrigger/legato toggle), an isolated `PreviewCard` (dedicated preview voice outside the MIDI pool — never steals from/into it; unity-Preserve zero-latency bypass scoped to it), and two-tier panic (CC 123 = release, CC 120 = immediate hard-stop incl. Trigger one-shots); processor sums the preview card alongside the engine + drain, `retireIdleDrain()` retires fully-idle drain snapshots, and voice-param edits rebuild from the already-decoded PCM (no bank re-read/WAV re-decode) via the drain-slot swap; `ComponentState` envelope bumped v6→v7 (voiceCount/voiceMode/monoTrigger bytes; pre-v7 blobs lift to 16/Poly/Retrigger).
 
 ## One-time submodule setup
 
@@ -98,7 +98,7 @@ There is no hot-reload. Copy the built binary into REAPER's `UserPlugins/` folde
 - `actions` — registers the capture/placement/slot, Design View, multi-bank, and prune action families; routes each via the `command_id`/`gaccel`/`hookcommand` contract. **Every bank index verb wraps its mutation in a batched REAPER undo point (`Undo_BeginBlock2`/`EndBlock2`, `UNDO_STATE_MISCCFG`) so one bank operation is one Ctrl-Z.** The prune action (`BANK_PRUNE_FOLDER`) is **the ONLY file-deletion authority in the system**; it opens no undo point (file deletion is not REAPER-undoable).
 
 **VST3 instrument (`src/vst/`) — pure core:**
-- `sampler_core` — polyphonic voice engine with bounded stealing, per-zone `ZonePlayParams` (Gate/Trigger, AHDSR, pitch engine Varispeed/Preserve, AD pitch mod envelope), repitch/interpolation with loop-point-aware sustain.
+- `sampler_core` — polyphonic voice engine with bounded stealing, user-parameterized voice count (1–32, default 16), `VoiceMode` Poly/Mono (last-note held-note stack, `MonoTrigger` Retrigger/Legato toggle), isolated `PreviewCard` (dedicated preview voice outside the MIDI pool — never steals from/into it; unity-Preserve zero-latency bypass scoped to it), two-tier panic (CC 123 = all-notes-off release, CC 120 = immediate hard-stop including Trigger one-shots); per-zone `ZonePlayParams` (Gate/Trigger, AHDSR, pitch engine Varispeed/Preserve, AD pitch mod envelope), repitch/interpolation with loop-point-aware sustain.
 - `sample_map` — zone payload: zones keyed by note range. **Wall-clock times stored as rate-free SECONDS, resolved against the live project rate — NO hardcoded sample rates in `src/`** (Daniel's standing ruling, load-bearing). JSON round-trip.
 - `pitch_shift` — hand-rolled overlap-add pitch shifter for the Preserve playback mode; no third-party dependencies.
 - `bank_sync` — generation change-detection + assignment-request consume: owns the yes/no decision logic so the rules are provable without a host. The processor shell owns cadence and side effects.
@@ -116,7 +116,7 @@ There is no hot-reload. Copy the built binary into REAPER's `UserPlugins/` folde
 
 **VST3 instrument (`src/vst/`) — shells:**
 - `reaper_bridge` — READ-ONLY bank consumer: receives bank snapshots from the extension and exposes them as a read-only view. **Never writes to the extension's bank** — this is a load-bearing invariant; no mutation path exists in this module.
-- `reasampler_processor` — VST3 `SingleComponentEffect` shell: declares event-input bus + stereo output, marshals MIDI note-on/off into the VoiceEngine, renders audio; owns off-audio-thread `reloadFromBank` + atomic pointer swap so `process()` does no allocation, no file I/O, no bridge calls.
+- `reasampler_processor` — VST3 `SingleComponentEffect` shell: declares event-input bus + stereo output, marshals MIDI note-on/off into the VoiceEngine, renders audio; owns off-audio-thread `reloadFromBank` + atomic pointer swap so `process()` does no allocation, no file I/O, no bridge calls. Sums the `PreviewCard` alongside the engine + drain in `process()`; `retireIdleDrain()` retires fully-idle drain snapshots on the UI-timer cadence. Voice-param edits (`setVoiceCount`/`setVoiceMode`/`setMonoTrigger`) rebuild the engine from the already-decoded keymap via the drain-slot swap — no bank re-read, no WAV re-decode, no audible cut to ringing tails.
 - `reasampler_editor` — VST3 `IPlugView` LICE editor shell: hosts a LICE-drawn child window; default face is the capture browser, then single-capture setup, with opt-in zones panel. Drop-onto-editor ingest is NOT shipped (deferred).
 - `reasampler_embed` — implements `IReaperUIEmbedInterface` so the instrument draws inline in the TCP/MCP without a plugin-owned HWND; delegates layout/hit-test to `embed_strip`.
 - `vst_entry` — VST3 entry point: `GetPluginFactory` export, class registration, channel-forked class UIDs.