Merge dev into phase-b-multibank (integrate parallel M7/8 + Phase D work before dev promotion)

# Conflicts:
#	CLAUDE.md
#	CMakeLists.txt
#	src/actions.cpp
#	src/bank_panel.cpp
#	src/persist.h

CLAUDE.md

@@ -22,7 +22,7 @@ Vendors two submodules (see `.gitmodules`):
     cmake --build build
     ctest --test-dir build
 
-Eight targets:
+Key targets (see CMakeLists.txt for the full list):
 
 | Target | Kind | Purpose |
 |---|---|---|
@@ -33,6 +33,7 @@ Eight targets:
 | `view_tree_tests` | executable | Pure unit tests for `view_tree` — no REAPER, no DAW. |
 | `mode_switch_tests` | executable | Pure unit tests for `mode_switch` — no REAPER, no DAW. |
 | `bank_book_tests` | executable | Pure unit tests for `bank_book` — no REAPER, no DAW. |
+| `wav_trim_tests` | executable | Pure unit tests for `wav_trim` — no REAPER, no DAW. |
 | `reaper_reasampler` | loadable module | The actual extension binary (`.dll` / `.dylib` / `.so`). |
 
 ### macOS / Linux: SWELL dialog resources
@@ -56,12 +57,13 @@ There is no hot-reload. Copy the built binary into REAPER's `UserPlugins/` folde
 - `view_tree` — pure `I_FOLDERDEPTH`→FolderTree helper for the Design View shell; no REAPER types at the boundary.
 - `mode_switch` — REAPER-free segment layout + hit-test math for the bank_panel's Design View mode switch; divides a header rectangle into N equal segments and hit-tests a point to a segment. Mirror of `bank_grid`.
 - `bank_book` — multi-bank registry (Phase B): an ordered set of banks (pool seeded as bank-zero + named banks), each wrapping a `BankIndex`. Owns create/rename/reorder/delete of named banks, pool privileges (un-deletable/un-renamable/un-evacuable, never zero banks) enforced in-model, active-bank id, index-only move/copy of a sample between banks, JSON round-trip + legacy-`bank_index`→pool migration. Wraps `BankIndex` (bank_model untouched; no `bankId` on `Sample`).
+- `wav_trim` — 32-bit-float WAV parse + header-aware truncate plan (RIFF/data size rewrite) for the realtime tail's PCM decay-scan trim (T2). Rejects WAVE_FORMAT_EXTENSIBLE with non-float SubFormat GUID. Depends on `peaks` for the `AudioSample` float alias.
 
 **REAPER-facing shells:**
 - `capture` — `ICaptureBackend` interface; `OfflineRenderBackend` (deterministic default) and `RealtimeRecordBackend`. 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: thumbnails, audition, multi-select, keyboard navigation.
-- `persist` — project ext state (`SetProjExtState` / `GetProjExtState`, namespace `"reasampler"`) ↔ `bank_model` JSON + `ViewModeModel` JSON (`"view_state"` key); project-relative path resolution.
+- `persist` — project ext state (`SetProjExtState` / `GetProjExtState`, namespace `"reasampler"`) ↔ `bank_model` JSON (`"bank_index"` key) + `ViewModeModel` JSON (`"view_state"` key) + `TailSetting` JSON (`"tail_setting"` key); project-relative path resolution.
 - `view` — Design View shell: reads the folder tree via `view_tree`, snapshots flag values before parking, drives hide + CPU-park on inactive-mode leaves (`B_SHOWINTCP`/`B_SHOWINMIXER`/`B_MAINSEND`/`I_FXEN` + per-FX offline) and derived visibility on parents; 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 used by both the view shell and the actions layer.
 - `actions` — registers the capture/placement/slot action family and the Design View action family (toggle active mode, activate Arrange/Design, tag/untag selected tracks, show-both); routes each to the modules above via the `command_id`/`gaccel`/`hookcommand` contract.