Q-W6: registration table (OCP) in main.cpp; bank verbs -> shell/bank_ops(Session&); persist.h + wav_trim + namespaces.h shims deleted; 61/61

capture.h realtime seam split to capture_realtime_shell.h; GetProjExtState grow-loop rehomed to core/wire/ext_state_read; stale persist.cpp/bank_panel.cpp comment refs fixed; CLAUDE.md persist/bank_book/actions bullets updated. Command-id suffixes, display phrases, and undo labels byte-identical.

CLAUDE.md

@@ -61,7 +61,7 @@ There is no hot-reload. Copy the built binary into REAPER's `UserPlugins/` folde
 - `bank_grid` — REAPER-free grid layout, selection, keyboard-nav, and thumbnail-cache-key logic for the docked bank panel.
 - `tab_strip` — REAPER-free scrollable tab-strip layout + hit-test for the named-banks strip.
 - `mode_switch` — REAPER-free segment layout + hit-test for the bank_panel's Design View mode switch.
-- `bank_book` — multi-bank registry: an ordered set of banks each wrapping a `BankIndex`. **Pool privileges (un-deletable/un-renamable/un-evacuable, never zero banks) enforced in-model.** Owns create/rename/reorder/delete of named banks, active-bank id, index-only move/copy/remove of a sample between banks, and JSON round-trip.
+- `bank_book` — multi-bank registry: an ordered set of banks each wrapping a `BankIndex`. **Pool privileges (un-deletable/un-renamable/un-evacuable, never zero banks) enforced in-model.** Owns create/rename/reorder/delete of named banks, active-bank id, and index-only move/copy/remove of a sample between banks. The JSON round-trip lives in the sibling `bank_book_json` TU (Q-W5 split; serialize/deserialize via a private static `nameKey` seam) — one model, one codec, same public surface.
 - `owned_manifest` — the set of project-relative files the capture path itself created, persisted under the `"owned_files"` ext-state key, so the prune path can distinguish the bank system's own orphans from hand-dropped files.
 - `app_version` — REAPER-free version/channel identity: CMake-sourced semver constant, ext-state stamp value, and the full set of channel-derived identity accessors. All channel strings derive from one `REASAMPLER_CHANNEL_IS_BETA` bit; no scattered `#ifdef`s in the shells.
 - `wav_codec` — chunk walker + layout parse + float32 build + size-field patch + content hashes; the single pure RIFF/WAV owner. (`wav_trim` is now a transitional forwarding alias onto `wav_codec`, kept only so the Q-W2v TUs it feeds compile untouched; retire it once that wave lands.)
@@ -88,7 +88,7 @@ There is no hot-reload. Copy the built binary into REAPER's `UserPlugins/` folde
 - `capture` — two CONCRETE backends with deliberately different lifecycles (no shared interface — the former `ICaptureBackend` was deleted in Q-W3, T4-26: one deriver, zero polymorphic call sites): `OfflineRenderBackend` (deterministic default, synchronous) and `RealtimeRecordBackend` (async begin/tick/abort). Input: `CaptureRequest`. Output: finished file + populated `Sample` handed to `bank_model`.
 - `insert` — placement via `InsertMedia`. **Conform-to-project-tempo is an explicit opt-in flag, never silent stretching.**
 - `bank_panel` — docked LICE-drawn grid with three-zone layout: top toolbar (Capture → Maintenance → Placement via `action_bar`, short labels, More (⋯) overflow menu via `overflow_menu`), bottom toolbar (four opposite-mode tag buttons + Show Both), and footer (`[Arrange|Design]` toggle, Tail button, Prune via `footer_bar`). Grid renders in sparse slot order with gap cells, drop dispatch, metadata overlay, and selection via `accent/tertiary` purple border. Draws through the L1 kit by palette role; OS drag-out via `drag_out` + `drag_out_win`.
-- `persist` — project ext state (`SetProjExtState`/`GetProjExtState`, namespace `"reasampler"`) ↔ `BankBook` JSON, `ViewModeModel` JSON, `TailSetting` JSON, `OwnedManifest` JSON, and writing-version stamp. A `projectconfig` hook triggers a deferred session reload on undo/redo. Hosts the prune dry-run and full-set orphan queries; supplies `referencedPaths()` + `owned().paths()` to the `prune_reconcile` pure core. **pS-usage:** `scanPruneOrphans` unions instance usage via `usage_scan`; `PruneReport` gains `abortedUnreadableUsage` + `offendingUsageKeys`; dry-run / orphan-set / reclaim each independently abort (delete nothing) when usage state is unreadable.
+- `shell/persist` (`session` / `ext_state_io` / `prune_fs`) — the persist seam, split by responsibility (Q-W5; the former `persist.cpp` god-TU and its `persist.h` compatibility umbrella are both retired — callers include `shell/persist/session.h` / `ext_state_io.h` directly). `session` owns the `ReaSamplerSession` lifecycle: the poll identity-transition detection (load / Save-As / forked sibling / recycled pointer) and the `projectconfig`-driven deferred undo/redo reload. `ext_state_io` owns project ext state (`SetProjExtState`/`GetProjExtState`, namespace `"reasampler"`) ↔ `BankBook` JSON, `ViewModeModel` JSON, `TailSetting` JSON, `OwnedManifest` JSON, the writing-version stamp, GUID minting, and bank-folder relocation. `prune_fs` hosts the prune dry-run / full-set orphan queries (supplying `referencedPaths()` + `owned().paths()` to the `prune_reconcile` pure core) and is **the single file-deletion authority over user files in the bank folder** (`deleteOrphanFile` via `SHFileOperationW`); nothing else in the system deletes bank-folder bytes. **pS-usage:** the prune scan unions instance usage via `usage_scan`; `PruneReport` carries `abortedUnreadableUsage` + `offendingUsageKeys`; dry-run / orphan-set / reclaim each independently abort (delete nothing) when usage state is unreadable.
 - `usage_scan` — extension-side prune-scan shell (pS-usage): at prune-scan time, enumerates every `rsusage_*` ext-state key, decodes each `sample_usage` wire record, enumerates every ReaSampler 9000 FX instance across all tracks + master / normal + record chains / containers (recursive) / take FX, and folds with `sample_usage::foldUsageRecords` / `usageHeldPaths` to produce the set of held paths — or `abortPrune` when any record is unreadable (fail-safe: an unreadable record may protect anything, so the prune halts). Feeds `prune_reconcile::mergeReferenced`. Read-only: writes no ext-state.
 - `view` — Design View shell: snapshots flag values before parking, drives hide + CPU-park on inactive-mode leaves (`B_SHOWINTCP`/`B_SHOWINMIXER`/`B_MAINSEND`/`I_FXEN` + per-FX offline), restores from snapshot. **Never touches master or `B_MUTE`/`I_SOLO`.**
 - `track_guid` — shared `MediaTrack*` → canonical GUID-string formatter; single source of truth for membership keys.
@@ -97,7 +97,7 @@ There is no hot-reload. Copy the built binary into REAPER's `UserPlugins/` folde
 - `ingest` — ingest-through-the-bank shell on the EXTENSION side: three surfaces — (1) arrange capture→bank→assign (bindable action), (2) Media-Explorer import→bank→instrument on the selected track, (3) file drop onto the bank panel→bank only. Only surface (1) writes the `assignment_request` ext-state wire. **ingest NEVER inserts a timeline item.**
 - `instrument_drop_win` — FX-button drop shell: resolves a screen point to a track + FX-surface hotspot, then adds a ReaSampler 9000 instance and applies the dragged capture's state via a transient `.vstpreset` + `TrackFX_SetPreset` (the former `TrackFX_SetNamedConfigParm` "vst_chunk" write was silently unappliable for VST3). Exposes `loadInstrumentOntoTrack` (inner half, no own undo block) and `performInstrumentDrop` (wraps in its own undo block). **Never captures, never writes the bank, never inserts a timeline item.**
 - `draw_kit` — shared LICE draw shell: `fillSurface`, `drawButton`/`drawSlider`/`drawListRow`/`drawWaveform`, cached-font `text()`, full interaction-state model, double-buffer preserved. Consumes `theme` + `component_geometry`.
-- `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). **pS-usage:** `BANK_PRUNE_FOLDER` halts on `abortedUnreadableUsage` and prints the offending `rsusage_*` key names with clear instructions.
+- `shell/actions` (`action_registry` / `design_view_actions` / `bank_actions` / `prune_action`) — the bindable action families, all routed via the `command_id`/`gaccel`/`hookcommand` contract. `action_registry` owns the shared registration plumbing (interned channel-qualified id strings; register and mirror-unregister present the identical pointer) **and the Q-W6 registration TABLE**: `main.cpp`'s own family (capture scopes, panel toggle, insert, batch, realtime, recapture, version) is one `ActionTableRow` array — suffix, phrase, flat function-pointer handler — that registration, hookcommand dispatch, and the unload mirror-unregister all iterate, so adding an action touches the table only (OCP). Bank mutations flow through the promptless `shell/bank_ops` verbs (`bankOp*` + `persistBankOp`, taking `ReaSamplerSession&`), which the panel menus and `bank_actions` consume as thin UX skins. **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 (`prune_action`, `BANK_PRUNE_FOLDER`) is **the ONLY file-deletion action in the system**; it opens no undo point (file deletion is not REAPER-undoable). **pS-usage:** `BANK_PRUNE_FOLDER` halts on `abortedUnreadableUsage` and prints the offending `rsusage_*` key names with clear instructions.
 
 **VST3 instrument (`src/vst/`) — pure core:**
 - `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), 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. Preview injects a synthetic note-on at the loaded capture's root note into the main `VoiceEngine` — no dedicated `PreviewCard`; preview obeys polyphony/mono/voice-stealing/envelopes.