reasampler/PLAN.md

# PLAN.md — ReaSampler milestone roadmap

Living milestone roadmap for ReaSampler. Derived from CONTEXT.md's 11-step build
order; CONTEXT.md remains the authoritative spec — this file is the tickable
checklist, not a re-statement of the spec. When a point lands, doc-keeper removes
it here and appends it to `COMPLETED.md`.

**Conventions**
- One checkbox `- [ ]` = one discrete, independently-landable point.
- Each milestone opens with a **Goal** (one line) and a **Verify** criterion
  (the acceptance gate; precision invariants pulled in where one applies).
- Verify-in-DAW points require a manual REAPER run; pure points are gated by CTest.
- "See CONTEXT.md §…" points at the authoritative detail — do not duplicate it here.

---

## Milestone 9 — slots (MPC-style)

> **Abandoned (Daniel, 2026-07-27) — will not be built.**

**Goal:** "Capture to slot N" / "insert slot N", MIDI-bindable. CONTEXT.md
Build order 9.
**Verify (in DAW):** Slot capture and slot insert fire from MIDI bindings; slot
state persists via the index.

- [ ] Slot model + slot↔sample assignment.
- [ ] "Capture to slot N" / "insert slot N" actions, MIDI-bindable.

## Open questions to resolve during build
Carried from CONTEXT.md §Open questions — keep visible until each is closed by a
landed milestone.

- **`parseInt` narrowing hardening:** `src/bank_model.cpp` `parseInt` casts
  `int64_t → int` via `static_cast` without a range check; integers that fit
  in int64 but exceed `INT_MAX` are implementation-defined. Hardening candidate
  — add bounds check before the cast when integer-field validation is in scope.
- **Capture send/routing isolation (TODO):** The FX-scope capture neutralizes out-of-scope FX, gain, and pan — but NOT aux **sends**. So a downstream coloring send (e.g. a folder → reverb-track send) still routes and blends the reverb into an item/track capture, past the intended isolation point. A true item-level capture should be taken at the isolated graph point — the target scope's output before out-of-scope track FX/gain/pan **and** before out-of-scope aux/parallel sends. The hard part: distinguish **source routing that must be preserved** (e.g. a MIDI send T1→T2 where T2's synth is where a MIDI item's audio is actually produced — the "item level" for that MIDI item is T2's synth output) from **coloring sends that must be excluded** (folder→reverb). Repro: folder F1; T1 (MIDI) sends MIDI to T2 (synth); T1+T2 → F1; F1 sends to reverb T3; capturing the MIDI item on T1 currently includes the reverb, should be isolated to T2's synth output pre-F1 with the MIDI send preserved and the reverb send excluded. Likely approach: snapshot + mute out-of-scope tracks' aux sends during the render while preserving the main/source signal path — needs a rule for which sends are load-bearing.

---

# Phase D2 — Two-canvas (item-level mode projection; additive to D1)

> **Design View sub-phase.** Extends D1's track-level mode projection to **item
> level** via REAPER 7 fixed lanes: on a track present in both stances, each mode
> owns a fixed lane — the active mode's lane shows and plays, the inactive mode's is
> hidden and silenced — so a Design take and an Arrange take can share the same
> track and time position without colliding on the view. Nothing in D1 changes.
> Runtime floor rises to **REAPER 7** for this sub-phase (no version-gate branch;
> below v7 it is simply unavailable). Authoritative spec: **CONTEXT.md §Two-canvas
> sub-phase (Phase D2 / Phase E)** and the surrounding §Design View — additive phase
> spec. Product framing: `docs/product/design-view.md` §Two-canvas direction. When a
> point lands, doc-keeper moves it to `COMPLETED.md`.
>
> **D2-W1 (pure lane extension), D2-W2 (shell: lane application + new-content
> detection), D2-W3-A (lane minting + item→lane assignment + persist round-trip),
> and D2-W3-B (item-level mode actions + W3-A polish) have all landed** — see
> `COMPLETED.md`. **Phase D2 is functionally complete.**
>
> **Deferred:** panel UI indicator for per-track lane/mode state (a per-track
> lane-split marker). The mode switch already shows the active mode; no natural
> cheap home for a per-track indicator was found in the bank panel. Explicitly
> deferred — not silently dropped. Can be picked up later if wanted.

---

# Phase S — MIDI-playback instrument (native VST3 sampler; a second build artifact)

> **Landed on dev (merged 2026-07-27); DAW verification pending Daniel's smoke test.**
> S1–S18 and the product-name/binary-rename work are all on dev. The cross-artifact
> ingest relay (S13 bullet) was explicitly DEGRADED and remains deferred — see below.
> Completed material archived in `COMPLETED.md`. Authoritative spec: **CONTEXT.md
> §MIDI-playback instrument — additive phase spec (Phase S)**. Product framing:
> `docs/product/midi-playback.md`.
>
## S13 — cross-artifact ingest relay (deferred)

> **SPIKE VERDICT (ps-w12, 2026-07-27): DEGRADED — relay deferred.** The instrument's
> REAPER bridge (`reaper_bridge`) is deliberately READ-ONLY; a relay would need a new
> instrument WRITE seam into ext-state and an extension-side timer poller servicing a
> drop-ingest inbox key with a claim/clear nonce — the same cross-process handshake race
> the S17 spec rejected for alternative (A). Both the read-only-instrument boundary and
> the new poller are load-bearing design calls, so the relay is deferred to a future wave.
> The shipped ingest gesture stays drop-onto-docked-panel (S8). The degrade path (editor
> shows a "drop files onto the ReaSampler bank panel to add them" affordance) landed as
> part of Phase S. See `COMPLETED.md` §S13 for full context.

- [ ] Cross-artifact ingest relay: the editor hands the dropped path + this instance's
  identity to the extension as a bank-ingest request over an agreed seam. DEFERRED —
  relay mechanism proved load-bearing to redesign; drop-onto-panel (S8) is the shipped
  ingest path. Requires (a) a new instrument WRITE seam into ext-state and (b) an
  extension-side timer poller + claim/clear nonce. A future wave when the design is ready.

## Phase S — held and optional-forever (noted, not specified)

> S3–S11 have landed; archived in `COMPLETED.md`. S12 and S13 (partial) have also
> landed; archived in `COMPLETED.md`. The cross-artifact relay (S13) remains deferred — see §S13 above.

> S8 has landed; archived in `COMPLETED.md`.

> S9 has landed; archived in `COMPLETED.md`.

> **S0-DS moved to Phase L (2026-07-26).** The shared LICE drawing kit that stood here is
> now **Phase L point L1** on `dev` — see PLAN.md §Phase L + CONTEXT.md §Phase L and
> `docs/product/visual-design-language.md` (all on `dev`). S10–S13 below build with the
> current drawing and **adopt the L1 kit when it lands — not gated on Phase L.**

> S10, S10-Z, and S11 have landed; archived in `COMPLETED.md`.

> S12 has landed; archived in `COMPLETED.md`.

> S13 (drop-to-load) has partially landed; archived in `COMPLETED.md`. Cross-artifact relay remains deferred — see §S13 above.

> S15 has landed; archived in `COMPLETED.md`.

> S16 has landed; archived in `COMPLETED.md`.

> S17 has landed; archived in `COMPLETED.md`.

> S18 has landed; archived in `COMPLETED.md`.

> **S14 moved to Phase L (2026-07-26).** The dock-panel refresh that stood here is now
> **Phase L point L2** on `dev` — and, per Daniel's DS-3 call, expanded from a light re-skin
> into a **thorough dock-panel layout redesign** that lays out the full M11-aware button
> inventory before applying the kit. See PLAN.md §Phase L + CONTEXT.md §Phase L and
> `docs/product/visual-design-language.md` (all on `dev`). The design-system forks DS-1/
> DS-2/DS-3 are all **SETTLED (2026-07-26)** and recorded in the Phase L docs on `dev`.

## Phase S — product name (ReaSampler 9000)
The MIDI-playback instrument's product name is **ReaSampler 9000** (Daniel, 2026-07-26,
on DAW-testing the S1–S6 instrument). The extension remains **ReaSampler**; the instrument
is **ReaSampler 9000**. Framing + propagation surfaces:
`docs/product/midi-playback.md` §Product name.

- [ ] Propagate the display name **ReaSampler 9000** across user-visible surfaces: the VST3
  class **display name** string (in the factory registration), the `IPlugView` editor title
  band (currently "ReaSampler Instrument"), the S6 embed-strip label, and the Phase S docs.
  **Do NOT change the VST3 class UID** — instances in already-saved projects key off it; a
  UID change orphans every existing instance.
- [ ] **Rename the binary filename too (S-NAME-1 SETTLED, Daniel 2026-07-26):** rename the
  built VST3 module (CMake `OUTPUT_NAME` / target artifact — e.g. `reasampler_9000.vst3`)
  alongside the display strings, so the on-disk name matches the product name. Record the
  full rename surface: **CMake output name** (the second VST3 target's artifact name), the
  **factory vendor/name strings**, the **`IPlugView` editor title**, and the **S6 embed
  label**. Do NOT touch the **VST3 class UID** (unchanged — the compat anchor).
- [ ] **Compat verification (must-DAW-verify before shipping the rename):** the working
  assumption is that REAPER **rebinds a saved instance by its VST3 class UID, not by the
  module filename**, so a filename rename with an unchanged UID keeps saved projects working
  (existing instances still resolve). **This is not yet confirmed from source** — a web
  check surfaced a JUCE/VST3-replace-VST2 case suggesting REAPER's binding is more nuanced
  than "UID only" (it can involve an FXID match), so treat UID-rebind as **to-verify, not
  asserted fact**. **DAW-verify:** save a project with a ReaSampler 9000 instance under the
  old filename, rename the module, reopen — confirm the instance rebinds and restores its
  state. If REAPER does key partly on filename, fall back to keeping the current filename
  (display-strings-only) and record that as the shipped choice.

- **Tier 2 — "expressive" (HELD).** Velocity layers, round-robin (anti-machine-gun),
  full ADSR, per-sample tuning/gain trim, sustain loops. The next depth increment once
  Tier 0–1 proves the instrument belongs — **its points are not drawn up here.**
- **Tier 3 — "instrument polish" (optional-forever).** Filters, filter/pitch
  envelopes, LFOs, per-voice pan, choke groups, a modest FX slot. A direction to leave
  room for, never a commitment. **Note:** S16 lands the *pitch* envelope + the Varispeed/
  Preserve pitch-engine mode early (Daniel's directive) — the Tier-3 "filter/pitch envelopes"
  line now means the *filter* envelope + LFOs remainder.
- **Sinc Varispeed-quality upgrade (HELD — WDL_Resampler).** `WDL_Resampler`'s sinc mode
  beats the core's 2-point linear interp for **Varispeed** base-repitch quality (see the S16
  WDL finding). An optional per-voice quality toggle (linear default / sinc), RT-suitable but
  heavier. Held as a Tier-2/3 quality option — not needed for S15/S16, not scheduled. (A
  resampler couples duration, so it is a Varispeed-quality option only, **not** a Preserve
  engine.)
- **WDL_SimplePitchShifter swap (HELD — fork S16-F2 route a).** `WDL_SimplePitchShifter`
  as a drop-in swap for the `pitch_shift` pure module if the hand-rolled OLA onset latency
  or warble proves musically unacceptable. Same `PitchEngine::Preserve` contract behind the
  seam. WDL excluded from the shipped build by include-chain (windows.h); held as the
  quality/latency alternative.
- **Trigger choke-on-note-off (HELD — fork S15-F1).** A future option for Trigger mode to
  *cut* (choke) on note-off or on a same-group re-trigger (hi-hat open/closed). Deliberately
  out of S15 scope (Trigger ignores note-off entirely there); a Tier-3 choke-group direction.

## Phase S — editor view-model redesign (three views: Sample / Browse / Zone)

> **Additive Phase S sub-phase (S-VIEW; Daniel, 2026-07-27, r9).** Re-partitions the ReaSampler
> 9000 editor from a two-view toggle into a **three-view model where the loaded sample is the
> home** — Sample (default face), Browse (modal picker over Sample), Zone (dedicated keymap
> surface). Adds two performance parameters (key-tracking, preview velocity) and two visual
> components (envelope overlay, real piano-key pattern), and frames two engineering prerequisites
> (drop-to-FX bug, default window size). An **editor** redesign — the S3 voice engine, keymap
> resolution, and read-only-over-bank contract are **unchanged**; component state extends
> additively for key-tracking; VST3 class UID unchanged. Authoritative spec: **CONTEXT.md §Phase
> S — editor view-model redesign (S-VIEW)**. Product framing: `docs/product/midi-playback.md`
> §Addendum r9. When a point lands, doc-keeper moves it to `COMPLETED.md`.
>
> **Depends on Phase S being on dev** (this redesigns Phase S editor shells —
> `reasampler_editor.cpp` + the pure `src/vst/` geometry modules). **Phase L L3 is FINISHED and
> merged** (2026-07-27, commit `c53683e` — `reasampler_editor.cpp` + `reasampler_embed.cpp`
> restyled through the L1 kit). S-VIEW builds the new three-view layout **directly on the current
> L3 look-and-feel as its baseline — one implementation pass, styled correctly from the start.**
> There is **no two-pass "land S-VIEW then restyle through L3"** — L3 already happened; every new
> S-VIEW surface (Sample face, Browse modal, Zone surface, envelope overlay + node handles,
> piano-key strip, preview cluster) is drawn through the L1 kit at build time, inheriting the L3
> palette and component-draw grammar. Restyle-after is not a concern.

**Goal:** A three-view editor that makes "pick a capture, tune it, play it" fast, easy, and fun —
Sample is home, Browse is an easy-to-summon modal picker, Zone is the deliberate keymap surface.
**Verify (in DAW):** open on a 1080p screen → full Sample face (hero waveform + envelope overlay +
fenced root + preview-trigger + control strip) with no scroll; Browse opens as a modal over
Sample, select+confirm loads a new capture; Zone opens on its own button, key-tracking + the
piano-key pattern work; drop-a-capture-onto-FX instantiates a playing instance.

- [ ] **S-VIEW-1 — three-view navigation model.** Retire the flat Browser|Zones toggle; introduce
  Sample (home/default), Browse (modal overlay over Sample, select+confirm), Zone (dedicated
  surface, own button). Empty state surfaces Browse as the dominant call-to-action. Fresh instance
  stays silent (S10 reversal). See CONTEXT.md §S-VIEW navigation contract.
- [ ] **S-VIEW-2 — Sample view (the new main face).** Compose the home face: enlarged **hero
  waveform** with the S11 markers (moved from Browse), a **fenced root affordance**, the
  **Mono/Stereo toggle** (moved from Browse), and the **"Modes-and-down" control strip** (Mode /
  Pitch engine / AHDSR|Trigger / AD pitch env — moved from Zone's param panel, single-capture
  one-zone storage per S15-F2). Reference grammar: Simpler / Phase Plant (labelled value-strip
  under a hero waveform).
- [ ] **S-VIEW-3 — envelope overlay + DRAGGABLE NODES on the hero waveform (new visual + edit
  surface).** Draw the amp envelope (AHDSR for Gate, fade/%-length for Trigger) as a curve over the
  Sample waveform at accurate wall-clock time. New pure `envelope_overlay` module (params + frame-
  length → polyline; unit-tested); shell traces it in an accent hue. **The breakpoints are draggable
  handles** (S-VIEW-F2 SETTLED — in scope, not deferred): X → segment time, Y → level on level-
  breakpoint nodes (sustain drags both axes), monotonic-in-time + range-clamped so a drag can never
  produce a param the slider couldn't. New pure `envelope_edit` module (node hit-test + pixel-delta→
  clamped-param inverse map; mirror of `card_drag`; unit-tested at the clamp/monotonic boundaries).
  Sliders stay the precise numeric surface; **both surfaces read/write the same `PerformanceZone`
  envelope fields** — one source of truth, kept in sync by re-reading params each paint (no listener
  chain). Node-drag commits via the same off-audio-thread path a slider edit uses (no new RT
  surface).
- [ ] **S-VIEW-4 — preview-trigger + velocity knob (new, Sample view).** A button firing the
  sampler at the loaded capture's root note through the live voice engine (off the audio-thread
  commit path — no MIDI controller needed) + an adjacent velocity knob. **Preview velocity PERSISTS**
  (S-VIEW-F1 SETTLED): it lands as a new top-level `previewVelocity` field on `ComponentState` via an
  **envelope bump to v6** (`src/vst/sample_map.h`), round-tripped through the processor's existing
  `getState`/`setState` over `IBStream` — **not** the extension's project-scoped `persist` ext-state
  (wrong owner + wrong scope; see CONTEXT.md §S-VIEW). Zones payload untouched (independent version
  axes); older blobs lift to a mid default. RT discipline: no `process`-thread work.
- [ ] **S-VIEW-5 — Browse reduced to *choosing* (modal over Sample).** Keep search + bank tabs +
  captures grid + scroll + selection; add **confirm/cancel** (double-click loads). **Remove** the
  large waveform preview, Mono/Stereo toggle, root keyboard-strip (all moved to Sample), and the
  loop-point labels + track-root message (cut). Render as a full-window modal overlay (fork
  S-VIEW-F3).
- [ ] **S-VIEW-6 — key-tracking parameter (Zone + Sample, 0%–200%, default 100%).** A per-
  `PerformanceZone` scalar on keyboard pitch tracking around the root (100% = 12-tone-ET, 0% = no
  tracking, 200% = double). Additive/version-bumped, defaults 100% (bit-identical). **Key-track
  math lives in the pure sampler core** (unit-tested note/root/keyTrack → ratio), applied in both
  Varispeed and Preserve repitch. Surfaces as a control on the Zone param panel + Sample control
  strip.
- [ ] **S-VIEW-7 — real piano-key pattern on the keyboard strip (new visual).** Overlay the actual
  alternating white/black (bright/dark per palette) key pattern over the pastel spectral fill so
  the strip reads as a keyboard. Pure `keyboard_strip` gains a natural/accidental predicate (12-
  tone, unit-tested); shell draws the two-tone overlay. Shared by the Zone strip + Sample root
  affordance.
- [ ] **S-VIEW-8 — Zone view retained + wired.** Keep +Add Zone / Delete, the per-zone keyboard
  strip (now with the piano pattern), the Low/High/Root numeric-entry legend, and the per-zone
  param panel; add the key-tracking control. Nothing from today's Zones view dropped.

### Phase S editor prerequisites — routed to staff-engineer (bug + default; NOT design forks)

> Framed in CONTEXT.md §S-VIEW; both are functional prerequisites with the SDK swept and no
> platform ceiling — a diagnosis and a one-line default, not product decisions.

- [ ] **S-VIEW-BUG-1 — drop-to-FX diagnosis (staff-engineer).** Dropping a capture onto a track's
  FX chain does not instantiate + init ReaSampler 9000 (drops as audio to arrange instead). The
  S17 machinery is **SDK-correct and present** (`TrackFX_AddByName` + `vst_chunk` injection, all
  verified); this is a **runtime bug**. Investigate in order: (1) FX-name match (`"VST3:" +
  vstPluginName()` vs REAPER's scanned name); (2) gesture routing (`decideGesture` →
  `InstrumentDrop` vs falling to `OsDrag` — the observed symptom); (3) `vst_chunk` write result +
  blob-format match with `setState`. **Verify in DAW:** drop → a playing instance on the track,
  one Ctrl-Z removes it.
- [ ] **S-VIEW-SIZE-1 — 1080p default window size (staff-engineer).** The editor opens too small
  (`ViewRect(0,0,560,400)`). Mechanism **verified** (`getSize`/`setRect`/`checkSizeConstraint`/
  `onSize`/`canResize` in `vendor/vst3sdk/public.sdk/source/common/pluginview.h`): set a larger
  default `ViewRect` sized for the new three-band Sample face on 1080p (~840×560+ starting point,
  tuned to the band heights) + a `checkSizeConstraint` minimum floor. **Verify in DAW:** opens at
  the new default showing the full Sample face without scroll; cannot shrink below the floor.

### Phase S editor redesign — forks (Daniel's to call)
*(S-VIEW-F1 and S-VIEW-F2 SETTLED 2026-07-27 — folded into S-VIEW-4 / S-VIEW-3 above. F1: preview
velocity persists via envelope-v6 `ComponentState`. F2: envelope nodes are draggable via the pure
`envelope_edit` module. Only F3 remains open.)*
- **S-VIEW-F3 — Browse modal presentation:** full-window overlay (**lean**) vs. a centered sheet
  over a dimmed Sample. Presentation detail.

---

# Phase L — Look-and-feel (system-wide visual design language)

> **New pillar, own lettered namespace, taken up by a parallel team.** Phase L is the
> whole-system look-and-feel effort: a shared LICE drawing kit and the surfaces that
> adopt it, so ReaSampler and ReaSampler 9000 shed the flat "temple os" drawing for a
> modern, sleek 2026 dark synth look. It answers Daniel's post-DAW-test verdict on the
> instrument ("this looks like temple os… the VST is dogshit… scope it for the whole
> system… does Cockos have a toolkit?"). Namespaced **`L` (Look-and-feel)** so it is
> orthogonal to and ungated by the M/D/B/R/V/S pillars — a parallel team owns it while
> Phase S feature work proceeds independently. Authoritative spec: **CONTEXT.md §Phase L
> — visual design language (design-system spec)**. Product framing, the settled decision
> record (DS-1/DS-2/DS-3 all SETTLED 2026-07-26), palette, and the three visual
> directions: `docs/product/visual-design-language.md`. When a point lands, doc-keeper
> moves it to `COMPLETED.md`.
>
> **L1 (shared LICE drawing kit — the foundation), L2 (dock-panel layout redesign), L3
> (VST editor + embed-strip restyle), L4 (dock-panel button layout enhancement), L5
> (dock-panel button refinements), L6 (toolbar polish), and L7 (capture ordering, card
> metadata, and selection styling) have all landed** —
> `theme`/palette module, `component_geometry` geometry/hit-test helpers, `draw_kit` shell, GDI
> `DrawText` retirement in `bank_panel` (L1); `action_bar` pure task-grouped layout module, full
> M11-aware button inventory placed by task cluster, `bank_panel` redesigned through the L1 kit
> (L2); VST editor (`reasampler_editor.cpp`) + embed strip (`reasampler_embed.cpp`) restyled
> through the L1 kit — REAPER-grey neutrals + three pastel accents, pastel spectral keyboard
> strip + zone bars, hover/pressed/drag states, local `kCol*` forest-green palette retired (L3);
> three-zone layout (top capture/placement/maintenance toolbar, bottom Design-View toolbar,
> footer toggle + Tail button + Prune), `footer_bar` pure module, `ActionCluster::Tagging`/
> `Switching` in `action_bar` (L4); top-bar overflow menu (`overflow_menu` pure module),
> custom LICE-kit hover-delay tooltips (`tooltip` pure module), opposite-mode Item/Track tag
> buttons + Show Both, Toggle + Activate-Arrange/Design buttons removed, grouping spacing
> widened (`mode_enable` pure module) (L5); single-row button faces, keybinding in tooltip,
> Cancel RT moved to overflow, top-bar cluster order tidied (L6); per-bank `SlotMap`
> (id→slot) in `bank_book`, sparse-grid rendering, `card_drag` + `card_meta` pure modules,
> `captureTimeSigNum`/`captureTimeSigDenom` on `Sample`, tertiary-border selection (L7). See
> `COMPLETED.md`. **Phase L is complete.**
>
> **This section is self-contained for a team without Phase S context.** Where a point
> touches a Phase S surface (the VST editor, the embed strip, the keyboard strip), the
> gate is stated explicitly so the team does not chase files that are not on dev yet.
>
> **Settled decisions (Daniel, 2026-07-26 — see `docs/product/visual-design-language.md`
> §6):**
> - **DS-1 — toolkit: LICE + WDL free game, no external frameworks.** Draw the modern
>   look with LICE directly; reuse any useful WDL/vwnd piece (skin/image helpers, draw
>   idioms, a control like the scroll listbox) where it beats re-deriving — "don't
>   reinvent the wheel." Reject iPlug2 / JUCE / VSTGUI (external frameworks re-opening the
>   settled bare-SDK+LICE build shape). Keep hit-test geometry in pure CTest-covered
>   modules — do not import vwnd's retained-mode object model wholesale.
> - **DS-2 — visual direction: Direction B ("Neon Console") + Direction C's spectral
>   keyboard strip. SETTLED 2026-07-26, REVISED 2026-07-26 (Daniel) — palette-only.**
>   *Neutral surfaces (revised):* the neutral ladder moved **from near-black up into REAPER's
>   mid-grey theme family** so the dock reads as part of REAPER, not a black slab — `bg/base`
>   ≈ `#2b2b2b`, `bg/panel` ≈ `#333333`, `bg/cell` ≈ `#3a3a3a`, `line/hairline` ≈ `#4a4a4a`,
>   `text/primary` ≈ `#dcdcdc`, `text/dim` ≈ `~#a0a0a0`+ (elevation-ladder discipline
>   unchanged). *Accent layer (revised):* now a **three-accent pastel system** —
>   `accent/primary` pastel lime green (live/active/selected), `accent/secondary` pastel teal
>   + `accent/tertiary` pastel purple (categorical distinctions) — replacing the original
>   single electric cyan. The spectral keyboard strip is a **pastel** sweep anchored on the
>   three accents. *Tight WCAG pairs to re-verify against the grey ladder:* `text/dim`-on-grey
>   (mid-grey-on-mid-grey, AA 4.5:1) and the three pastels-as-indicators on `bg/cell` (shrunk
>   from ~15:1 to ~6:1–7:1). **A stylish/bundled-font upgrade was considered and DECLINED
>   (Daniel):** no font bundling/redistribution — the kit keeps its current cached-font face,
>   no new typeface. The kit palette stays abstract (roles, one constants block — three accent
>   roles + grey neutrals), so the direction is a single-file change; final hex is locked
>   against the theme WCAG tests within the pastel intent. Detail:
>   `docs/product/visual-design-language.md` §2.1/§4/§6 + CONTEXT.md §Phase L.
> - **DS-3 — dock-panel scope: a thorough layout redesign, not a light re-skin.** L2 lays
>   out the full button inventory (including M11's action-button additions) intuitively,
>   uncluttered, and useful — then applies the kit. Sequenced after M11 merges.

## Phase L — sequencing
```
L1 (shared kit) ──► L2 (dock-panel layout redesign) [LANDED]
        ├─────────► L3 (VST editor + embed-strip restyle) [LANDED]
        └─────────► L4 (dock-panel button layout enhancement) [LANDED]
                            └────► L5 (dock-panel button refinements; ungated, after L4) [LANDED]
                                        └────► L6 (toolbar polish; ungated, after L5) [LANDED]
                                                    └────► L7 (capture ordering + card metadata + selection styling; ungated, after L6) [LANDED]
```
L1, L2, L3, L4, L5, L6, and L7 have all landed. **Phase L is complete.**

## Phase L — must-verify-before-build
- **LICE design-kit surfaces (L1)** — `LICE_GradRect`, `LICE_RoundRect`, AA
  `LICE_Line`/`LICE_FLine`/`LICE_ThickFLine`/`LICE_Circle`/`LICE_FillCircle`/
  `LICE_DrawCBezier`, `LICE_FillTriangle`/`FillTrapezoid`/`FillConvexPolygon`, and the
  `LICE_CachedFont`/`LICE_IFont` font engine (`SetFromHFont`, AA `DrawText`, shadow/outline/
  glow FX flags). Verified *present* in `vendor/WDL/WDL/lice/lice.h` + `lice_text.h`
  (design-language doc §1.1); **confirm exact signatures + the `LICE_CachedFont`↔`HFONT`
  lifecycle at build.**
- **WDL/vwnd reuse assessment (DS-1)** — at build time, evaluate whether a vwnd piece beats
  re-deriving it: `virtwnd-slider.cpp` / `vwnd_slider_drawknobstack` as the slider/knob
  drawing reference, `virtwnd-listbox.cpp` as a candidate scroll listbox, `virtwnd-controls.h`
  for `WDL_STYLE_*` gradient hooks, `virtwnd-skin.h` for image-skin helpers. Reuse where
  useful; keep hit-test geometry pure regardless.
- **M11 button inventory (L2)** — resolved at L2 build: inventory taken against dev after
  M11 merged; all buttons placed by task cluster in the landed `action_bar` module.
- **L4 re-home surface (L4)** — resolved at L4 build: three-zone layout confirmed against the
  post-palette-revision `bank_panel`; `action_bar` extended with `ActionCluster::Tagging` +
  `Switching`; new pure `footer_bar` module covers footer layout/hit-test.
- **L5 refinement surface (L5)** — resolved at L5 build: `TrackPopupMenu` overflow menu
  confirmed; tooltip mechanism resolved as **custom LICE-kit hover-delay tooltip** (`tooltip`
  pure module; sourced from the registered action phrase, prefix stripped at draw time); item-move
  and track-tag action ids confirmed; active-mode read confirmed via the same
  `view().activeModeId()` the footer toggle uses.
- **L7 model + tempo surface (L7)** — **RESOLVED at build (L7 landed).** Forks F1/F2/F3 all
  confirmed: `TimeMap_GetTimeSigAtTime` confirmed at build for the meter stamp; SWELL stock
  cursors chosen for drop-result cues (Reorder→IDC_SIZEALL, Move→IDC_HAND, Copy→IDC_UPARROW,
  Replace→IDC_SIZEWE); existing pool-privilege guard reused as-is for Alt-replace. Gap navigation
  in the grid = skip gaps (arrow keys skip empty slots). See `COMPLETED.md` §L7.
---

# Phase Q — Quality (structural reorganization; zero-runtime-cost)

> **New pillar, own lettered namespace, and — uniquely — the LAST structural pillar.** Phase
> Q is a **pure structural refactor**: it reorganizes `src/` into a healthier shape (more
> encapsulation, granular namespaces, `core/`/`shell/`/`app/` subdirectories) against a stated
> quality bar — *"mtytel Vital is my code reference for quality"* — to bring the codebase
> "into the realm of something I can stand to look at." It ships **no feature and changes no
> behavior**: the test suite passing unchanged is the proof of correctness. Namespaced **`Q`
> (Quality)** — M/D/B/R/V/S/L are all taken; `Q` names the *end* (the quality bar), the reorg
> being the *means*. Authoritative spec: **CONTEXT.md §Phase Q — structural reorganization
> (reorg spec)**. Product framing, the Vital-grounded target shape, the grep-verified SOLID
> audit that is the evidence base, and the settled/recommended fork record (Q-1..Q-6):
> `docs/product/code-organization.md`. When a point lands, doc-keeper moves it to
> `COMPLETED.md`.
>
> **THE GATE (load-bearing — state first; reconciled to reality 2026-07-27).** Phase Q is
> **gated on the tree being otherwise quiescent.** Daniel's plain readiness target: **"when
> Phase S and L3 are finished."** **As of 2026-07-27 both gate conditions are satisfied:**
> Phase S merged to dev (2026-07-27); Phase L L3 (the VST restyle) merged to dev
> (2026-07-27, commit `c53683e`) — **Phase L is complete** (L1/L2/L3/L4/L5/L6/L7 all
> landed, see `COMPLETED.md`). **D2** is functionally complete (D2-W1..W3-B landed; the
> lone open item, a per-track lane-split panel indicator, is *explicitly deferred*, not a
> blocking residual). **M9** (slots) is **abandoned** (Daniel, 2026-07-27) — will not be
> built. D2 is named in the gate only so that *reactivating* its deferred panel indicator
> re-arms the quiescence condition; neither D2 nor M9 blocks the gate today. *Why the gate:* Phase Q
> touches **nearly every file in `src/`** (relocate into subdirectories, re-namespace every
> header, split the four largest TUs, plus the §2b renames). Every large in-flight branch
> (Phase S on its worktree, and L3 once it lands) is diffed against the *current flat
> layout*; landing a rename-and-relocate-everything reorg mid-flight forces every open
> branch through the worst conflict class (every hunk moved, every qualified reference
> changed) — a combinatorial re-resolution, not a linear one. Phase Q is *last* precisely
> because it reshapes the ground every other pillar stands on. Landing it early taxes every
> subsequent phase; landing it last taxes nothing. **The gate is now satisfied — Phase Q
> may begin.**
>
> **M9 disposition — resolved (Daniel, 2026-07-27): abandoned.** M9 is out; it will not be
> reactivated. The gate remains satisfied; no re-arm condition applies.
>
> **Settled (Q-1, this-doc):** the phase is **`Q` (Quality)**; point-id family `Q1..Qn`, wave
> prefixes `Q-W1..Q-W6`. **Recommended, Daniel's to call (Q-2..Q-9, see
> `docs/product/code-organization.md` §6):** Q-2 JSON extraction in scope + first (rec: yes);
> Q-3 directory shape `core/`/`shell/`/`app/` top-split with subsystem dirs beneath (rec: this
> over pure-Vital subsystem-first — it makes the pure/shell invariant *structural*); Q-4
> sub-namespace to match sub-directory (rec: both); Q-5 split god-modules to the audit's named
> seams, no finer (rec: yes); Q-6 OCP registration-table as the final wave (rec: in, last);
> **Q-7 naming rides the relocation waves, no dedicated naming wave (rec: yes — forced once
> Q-3/Q-4 settle); Q-8 class/module renames — fix the two that actively mislead (`BankIndex`→
> `BankModel`; the JSON `Parser`→`json::Reader`/`Writer`), leave the merely-quirky (rec);
> Q-9 align the `capture_realtime`/`realtime_record` shell↔core word order during W3 (rec: yes).**
>
> **HARD CONSTRAINT — performance (see CONTEXT.md §Phase Q, `docs/product/code-organization.md`
> §3).** The reorg must cost **zero runtime.** On the three hot paths — `peaks` envelope
> compute, audition/preview, the realtime-capture tick — **no added virtual dispatch, no
> header→TU indirection, no changed call/inline or branch shape.** `computeEnvelope` stays a
> free function on `const std::vector<float>&`; audition split stays a direct call-through;
> the realtime idle tick stays a single pointer test; `FxBypassGuard` stays stack RAII. This is
> an acceptance criterion on every point: *a split that would add a hot-path indirection is out
> of scope — rework it or drop it.*
>
> **NAMING dimension (added 2026-07-27; grep-verified audit in `docs/product/code-organization.md`
> §2b).** Beyond giving symbols a directory + namespace *home* (Q-3/Q-4), Phase Q also gives
> poorly/inconsistently-named symbols a consistent *name*, against the same Vital bar. The audit
> found: four `class Parser` copies collapsing to one `json::Parser` (Q-W1); shared pure-UI rect
> types (`FooterRect`/`ButtonRect`) that the codebase already hand-checks for collision
> (`footer_bar.h`'s "NAME NOTE") — resolved by the Q-4 sub-namespaces for free; the
> `bank_model`/`BankIndex` file↔class word-mismatch (Q-8); and the `capture_realtime`/
> `realtime_record` shell↔core word-order inversion (Q-9). **Renames ride the wave that already
> relocates/splits the file — no dedicated naming wave (Q-7);** the geometry-mirror
> `compute*`/`hitTest*` verb vocabulary and the `_tests` suffix are already consistent and are
> preserved verbatim. Naming changes are zero-behavior-change like the rest of Phase Q, and the
> FOREVER-STABLE contract strings (command ids, action names, ext-state namespace/keys, VST3 UID)
> are **not** C++ symbols and are never renamed.
>
> **Every point is independently landable and CTest-green at EVERY step.** The CMake
> per-module static-lib + per-module test-executable seams already draw the module boundaries;
> a file move + namespace change is mechanically verifiable — `ctest --test-dir build` is green
> or it isn't. **Green-CTest-at-every-point is an acceptance criterion.** Big-bang is rejected;
> the reorg is risk-ordered waves (W1 safe opener → W2–W5 god-module splits → W6 OCP finish).

## Q-W1 — safe opener: extract `core/json` + impose the directory/namespace layout on clean modules
**Goal:** The zero-god-module-risk opener. Two moves: (1) extract a pure **`core/json`** module
(parser + serializer) and **delete the four hand-rolled `Parser`s** in `bank_model` /
`bank_book` / `view_mode_model` / `owned_manifest` (the single largest DRY+SRP violation, and
entirely off the hot paths); (2) impose the settled `core/`/`shell/`/`app/` directory layout +
sub-namespaces (`reasampler::model`/`view`/`capture`/`audio`/`ui`/`reclaim`/`version`/`json`) on
the **30 clean pure libs + the clean shells that need no splitting** — pure relocation, no logic
change. Proves the wave discipline (relocate + encapsulate, CTest-green) before any god-module
surgery. CONTEXT.md §Phase Q (json extraction; directory + namespace map).
**Verify:** CTest green at every commit. The four duplicate `Parser`s are gone, replaced by one
`core/json` consumed by all four models; round-trip serialization is byte-identical to before
(no format change — a *structural* dedupe, not a behavior change). Every relocated clean module
compiles and its test executable passes unmoved. `Sample` (model) vs `AudioSample` (audio) vs
unified `Parser` (json) do not collide once sub-namespaced. No REAPER type crosses into any
`core/` file; the CMake pure/shell enforcement still holds.
**Depends on:** the GATE (tree quiescent). Nothing else in Phase Q.

- [ ] Extract `core/json` (pure parser + serializer: parseString/parseInt/parseKey/skipValue +
  escape, plus emit helpers); unify under `reasampler::json`; guard the `Parser` name against
  cross-lib collision. Off all hot paths — safe to abstract freely.
- [ ] Rewire `bank_model`, `bank_book`, `view_mode_model`, `owned_manifest` onto `core/json`;
  **delete the four duplicate `Parser`s.** Round-trip output byte-identical (dedupe, not
  reformat).
- [ ] Relocate the 30 clean pure libs into `core/{model,view,capture,audio,ui,reclaim,version,
  json}/` and the clean shells into `shell/{capture,panel,view,persist,actions}/`; move
  `main.cpp` to `app/`. Update `CMakeLists.txt` `src/` paths only (no target-graph change).
- [ ] Apply sub-namespaces matching the directories on every relocated *clean* module (the
  god-modules re-namespace their own new TUs as they split, W2–W5). Resolve `Sample`/
  `AudioSample`/`Parser` homes. **This alone resolves the naming *collisions*** (§2b.2): the
  shared pure-UI rect types (`FooterRect`/`ButtonRect`/`Selection`/`CellRect`) get one `ui::`
  owner — retire the hand-collision "NAME NOTE" in `footer_bar.h`.
- [ ] **Naming riders (Q-8, if settled):** rename the survivor JSON parser to `json::Parser`
  (or `json::Reader`/`json::Writer`); if Daniel takes the `BankIndex`→`BankModel` rename, land
  it here (mechanical class rename, verified by `bank_model_tests`). No rename on a file this
  wave isn't already relocating (Q-7).
- [ ] Confirm CTest green + no hot-path change: `peaks`/audition/realtime-tick untouched by this
  wave (pure relocation of clean modules; `peaks` stays a free function).

## Q-W2 — split `bank_panel.cpp` (the biggest god-module, 2424 LOC)
**Goal:** Split the largest god-module (8+ responsibilities) along the audit's named seams:
`panel_render` / `panel_thumbnails` / `panel_audition` / `panel_input` / `panel_bank_ops` /
`panel_window`. Split the fat `bank_panel.h` alongside (Interface Segregation). **Preserve the
audition hot path as a direct call-through, never virtual.** `panel_bank_ops` becomes the single
home for the bank-CRUD verbs that W4 will dedupe `actions.cpp` against. CONTEXT.md §Phase Q
(bank_panel split seams; hot-path audition guardrail). See `docs/product/code-organization.md`
§2.1, §5.
**Verify:** CTest green at every commit. Each seam is its own TU under `shell/panel/`; the panel
draws, thumbnails, auditions, handles input, does bank ops, and manages its window exactly as
before (no behavior change — verify in DAW that the panel is visually and interactively
unchanged). Audition/preview call path stays a **direct call-through** (no virtual dispatch, no
added header→TU indirection on the preview path). The ~20-function public API is now segmented
across the split headers.
**Depends on:** Q-W1 (directory/namespace layout established). Independently landable.

- [ ] Split rendering (`draw*`/`paint*`) → `panel_render`; thumbnail compute+cache →
  `panel_thumbnails`.
- [ ] Split the audio audition/preview engine → `panel_audition` — **direct call-through, not
  virtual; preview idle path unchanged.**
- [ ] Split input handling (mouse/key/wheel) + new-content detection → `panel_input`; window
  lifecycle + OS drag-out/drop-target → `panel_window`.
- [ ] Extract bank-CRUD verbs → `panel_bank_ops` (the future single owner; W4 dedupes
  `actions.cpp` against it). Split `bank_panel.h` into per-seam headers (I).
- [ ] Verify in DAW: panel unchanged; CTest green; no hot-path indirection added.

## Q-W3 — split `main.cpp` (hoist orchestration; leave main = pointers + entry + dispatch)
**Goal:** Reduce `main.cpp` (1762 LOC) to its actual job — API pointers + `ReaperPluginEntry` +
dispatch (~the owns-pointers ~120 lines) — by hoisting: `capture_orchestrator` (`RunCapture` /
`captureAndIndexOne` / `renderOffline` / batch/recapture/realtime `Run*`), `scope_resolve`
(`resolveRange`/`resolveRazorRange`/`collectSelectedTracks` + provenance assembly inputs), and
`realtime_lifecycle` (the realtime-capture state machine + globals + selection guards).
**`FxBypassGuard` moves out but stays a stack RAII object (precision-critical); the realtime idle
tick stays a single pointer test.** CONTEXT.md §Phase Q (main split seams; FxBypassGuard +
realtime-tick guardrails). See `docs/product/code-organization.md` §2.1, §3.
**Verify:** CTest green at every commit. Capture (offline + realtime + batch + recapture) behaves
identically in DAW; the null test still nulls, bit-identical repeats still match (the precision
invariants `FxBypassGuard` protects are unchanged); capture ≠ placement holds (no hoisted `Run*`
path gains an `InsertMedia` call). The realtime idle fast-path is still a single pointer test.
`main.cpp` is now pointers + entry + dispatch only.
**Depends on:** Q-W1. Independent of Q-W2.

- [ ] Hoist capture orchestration → `capture_orchestrator` (`shell/capture/`); keep
  `FxBypassGuard` a **stack RAII** object as it moves (precision-invariant-critical).
- [ ] Hoist scope/source resolution + provenance assembly inputs → `scope_resolve`.
- [ ] Hoist the realtime-capture lifecycle state machine + globals + the two RAII selection
  guards → `realtime_lifecycle`; **idle tick stays a single pointer test.**
- [ ] Leave `main.cpp` = API-pointer ownership + `ReaperPluginEntry` + dispatch; move to `app/`.
- [ ] **Naming rider (Q-9, if settled):** align the `capture_realtime` (shell) / `realtime_record`
  (pure) word-order inversion to the house shell↔core convention (rec: stem `capture_realtime`,
  shell suffixed) — a free rider since W3 already hoists the realtime lifecycle. No rename on a
  file this wave isn't already touching (Q-7).
- [ ] Verify in DAW: null test nulls, bit-identical repeats match, capture≠placement holds;
  CTest green; no realtime-tick branch-shape change.

## Q-W4 — split `actions.cpp` + dedupe bank verbs against `panel_bank_ops`
**Goal:** Split the two unrelated command-id families in one TU (981 LOC) into
`design_view_actions` / `bank_actions` / `prune_action`, and **dedupe** `actions.cpp`'s own
`promptText`/`mintBankId` and bank verbs against the `panel_bank_ops` single-owner established in
Q-W2. `prune_action` keeps the `doBankPruneFolder` deletion authority contract intact (routes to
`persist`'s `prune_fs` after W5). CONTEXT.md §Phase Q (actions split seams; bank-verb dedupe).
See `docs/product/code-organization.md` §2.1, §2.4.
**Verify:** CTest green at every commit. Every action fires identically in DAW (Design View
family; multi-bank create/rename/reorder/delete/evacuate/activate/move/copy/remove; prune). The
bank-CRUD verbs have **one** implementation home (no `bank_panel`/`actions` duplication). Each
bank verb still wraps its mutation in one batched undo point; the prune action still writes no
ext state and opens no undo point. Command-id strings are **unchanged** (FOREVER-STABLE
contract — a reorg must not touch a shipped command id).
**Depends on:** Q-W2 (`panel_bank_ops` is the dedupe target). Independent of Q-W3.

- [ ] Split → `design_view_actions` (toggle/activate/tag/untag/showBoth/moveItems),
  `bank_actions` (bank CRUD family), `prune_action` (`doBankPruneFolder` — the single
  file-deletion action).
- [ ] Dedupe `actions.cpp`'s `promptText`/`mintBankId` + bank verbs against `panel_bank_ops`
  (one owner); do **not** change any command-id string.
- [ ] Verify in DAW: all action families fire unchanged; one bank op = one Ctrl-Z; prune still
  no-undo/no-ext-state; CTest green.

## Q-W5 — split `persist.cpp` (isolate the single file-deletion authority into `prune_fs`)
**Goal:** Split `persist.cpp` (766 LOC, 5 responsibilities) into `session` (lifecycle+poll,
`BeginLoadProjectState` reload hook), `ext_state_io` (the ext-state ↔ JSON serialization bridge +
GUID minting + folder relocation), and **`prune_fs`** (prune scanning + `deleteOrphanFile` via
`SHFileOperationW`). The split **concentrates** the byte-deleting authority into one obvious
module — it must never spread it. CONTEXT.md §Phase Q (persist split seams; deletion-authority
isolation). See `docs/product/code-organization.md` §2.1, §7.
**Verify:** CTest green at every commit. Session save/load/undo-reload, ext-state round-trip,
folder relocation, and prune deletion all behave identically in DAW. **File deletion lives in
exactly one module (`prune_fs`)** — the single-file-deletion-authority invariant is *improved*
(concentrated), never diluted. Relative-paths-only persistence is unchanged.
**Depends on:** Q-W1. Best after Q-W4 (so `prune_action` routes cleanly to `prune_fs`), but
independently landable.

- [ ] Split → `session` (lifecycle/poll + `projectconfig` reload hook), `ext_state_io`
  (serialization bridge + GUID minting + folder relocation).
- [ ] Isolate prune scanning + `deleteOrphanFile` (`SHFileOperationW`) → **`prune_fs`** — the
  one file-deletion module; nothing else may delete bytes.
- [ ] Verify in DAW: save/load/undo-reload/relocation/prune unchanged; deletion authority is one
  module; relative-paths-only holds; CTest green.

## Q-W6 — OCP registration-table + residual fat-header (I) splits
**Goal:** Close the last SOLID wart: replace the ~350-line hand-written **non-table** action
registration blocks (now isolated in `app/main.cpp` after Q-W3) with a **registration table**, so
adding an action edits one place, not four parallel ones (OCP). Split any remaining fat headers
(`capture.h`/`persist.h`) not already resolved by their TU splits (I). CONTEXT.md §Phase Q (OCP
registration-table). See `docs/product/code-organization.md` §2.3, §6 (Q-6).
**Verify:** CTest green at every commit. Every action still registers, appears in the Actions
list, and fires via `hookcommand` exactly as before; command-id + display strings unchanged
(FOREVER-STABLE, per-channel); unload still mirror-unregisters everything. Adding a hypothetical
new action now touches the table only (demonstrated in review, not shipped). Remaining fat
headers are segmented.
**Depends on:** Q-W3 (registration code must be isolated first). Sequenced last; the most
droppable point if the phase needs narrowing (Q-6).

- [ ] Convert the hand-written `Register("command_id"/"gaccel"/"hookcommand")` blocks to a
  data-driven registration table; unload mirror-unregisters from the same table.
- [ ] Split residual fat headers (`capture.h`/`persist.h` and any other) alongside their TUs (I).
- [ ] Verify: all actions register/fire/unregister unchanged; command-id strings untouched; CTest
  green.

## Phase Q — sequencing
```
GATE: Phase S + Phase L L3 merged to dev (D2 complete, M9 abandoned) — tree quiescent
      ("when Phase S and L3 are finished" — L1/L2/L3/L4–L7 all landed — GATE SATISFIED)
  │
  ▼
Q-W1 (safe opener: core/json extract + directory/namespace layout on clean modules)
  ├─► Q-W2 (split bank_panel) ──► Q-W4 (split actions + dedupe bank verbs vs panel_bank_ops)
  ├─► Q-W3 (split main.cpp; hoist orchestration) ──► Q-W6 (OCP registration-table + I splits)
  └─► Q-W5 (split persist; isolate prune_fs)   [best after Q-W4]
```
W1 is the safe, high-leverage opener (all later waves assume the layout it establishes). The four
god-module splits (W2–W5) are risk-ordered and mostly parallel-safe; W4 depends on W2's
`panel_bank_ops`, W6 depends on W3's isolated registration code. Big-bang is rejected — every wave
is independently landable and CTest-green.

## Phase Q — must-verify-before-build
- **Hot-path call/inline shape** — before landing each split, confirm no virtual dispatch and no
  header→TU indirection was added on `peaks` envelope compute, audition/preview, or the realtime
  tick. `computeEnvelope` stays a free function on `const std::vector<float>&`;
  audition stays a direct call-through; the idle tick stays a single pointer test. (CONTEXT.md
  §Phase Q, `docs/product/code-organization.md` §3.)
- **Command-id + display strings are FOREVER-STABLE** — a reorg must not change a shipped
  `command_id` string, action display name, ext-state namespace, or VST3 class UID. Re-namespacing
  C++ symbols is orthogonal to these on-the-wire/on-disk contract strings; keep them byte-identical
  (per-channel, per the Phase V V4 contract). (CONTEXT.md §Phase Q.)
- **Name-collision sweep on sub-namespacing** — `Sample` (model) vs `AudioSample` (audio) vs the
  unified `Parser` (json), plus the shared pure-UI rect types `FooterRect`/`ButtonRect` (already
  hand-collision-checked in `footer_bar.h`), and any other cross-lib name that collides once
  flattened into granular namespaces. Resolve by each symbol's new subsystem home before landing
  W1. (naming audit §2b.2; `docs/product/code-organization.md` §6 Q-4/Q-8.)
- **Naming stays zero-behavior-change and off the wire** — the §2b renames touch C++ symbols only;
  no `command_id` string, action display name, ext-state namespace/key, `reasampler:` lane prefix,
  or VST3 class UID is renamed (naming audit §2b.5). A rename that would alter a shipped contract
  literal is out of scope, full stop.
- **The GATE** — do not begin any Q point until **Phase S + Phase L L3** are merged to dev and the
  tree is quiescent (D2 complete, M9 abandoned). Re-confirm quiescence against dev before W1.