docs(product): DS-2 revised — three-accent pastel palette + REAPER-grey neutrals

Replace the single electric-cyan accent with a pastel lime/teal/purple three-accent system; shift neutral surfaces + text from near-black to REAPER's mid-grey theme family. Font upgrade declined (no bundling). L3 conformed to the new look; gate intact.

PLAN.md

@@ -303,23 +303,40 @@ build:** the `IReaperUIEmbedInterface` contract + embed message/lifecycle agains
 >   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.** Near-black + one vivid accent everywhere; a hue-mapped spectral
->   keyboard strip as the signature surface. The kit palette is abstract (roles, one
->   constants block), so the direction is a single-file change.
+>   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.
 
 ## L3 — VST editor + embed-strip restyle (GATED on Phase S landing on dev)
 **Goal:** Bring the ReaSampler 9000 VST editor (`IPlugView` LICE surface) and the S6 embed
-strip up to the settled B+spectral look via the L1 kit: cached-font text, kit component
-draws, the Neon-Console palette, the **spectral keyboard strip** as the signature surface
-(DS-2), and hover/pressed/drag states throughout. CONTEXT.md §Phase L (VST restyle + the
+strip up to the settled-and-revised **B + three-accent pastel** look via the L1 kit: kit
+cached-font text (§3.1 — the kit's current face, no font change), kit component draws, the
+Neon-Console palette with **REAPER-grey neutrals** (`#2b2b2b`/`#333333`/`#3a3a3a`) and the
+**three pastel accents** (primary lime / secondary teal / tertiary purple), the **pastel
+spectral keyboard strip** as the signature surface (DS-2
+revised), and hover/pressed/drag states throughout. CONTEXT.md §Phase L (VST restyle + the
 Phase S coordination contract). Product framing: `docs/product/visual-design-language.md` §5.3.
-**Verify (in DAW):** the VST editor + embed strip render in the settled B+spectral language
-through the L1 kit — AA cached-font text, gradient/rounded kit components, the spectral
-keyboard strip, working hover/pressed/drag; the VST3 class UID is unchanged (a visual
-refresh is not a compat event).
+**Verify (in DAW):** the VST editor + embed strip render in the settled B + three-accent
+pastel language through the L1 kit — kit AA cached-font text, gradient/rounded kit
+components, the pastel spectral keyboard strip, working hover/pressed/drag; the VST3 class
+UID is unchanged (a visual refresh is not a compat event).
 **Depends on:** L1 (the kit) **AND — GATE — Phase S landing on dev.** The VST editor, embed
 strip, and keyboard strip live in Phase S, which is **not on dev yet** (it exists on the
 phase-s worktree). **L3 cannot be built on dev until Phase S's editor/embed surfaces
@@ -335,14 +352,18 @@ work.
 > Either way there is one kit and one look, and L3 is the point that completes the VST/embed
 > adoption and applies the settled B+spectral treatment.
 
-- [ ] Route the VST editor's + embed strip's text through the kit's cached-font `text()`;
-  retire their raw GDI `DrawTextA` path. (Gated — Phase S surfaces must be on dev.)
+- [ ] Route the VST editor's + embed strip's text through the kit's cached-font `text()`
+  (the kit's current face — §3.1, no font change); retire their raw GDI `DrawTextA` path.
+  (Gated — Phase S surfaces must be on dev.)
 - [ ] Restyle the editor + embed components through the kit (buttons, sliders/ADSR, list
-  rows, waveform, segmented controls) in the B (Neon Console) palette; add hover/pressed/
-  drag states. (Gated.)
-- [ ] Apply **Direction C's spectral treatment to the keyboard strip** (hue-mapped zones,
-  glow-on-active as a static drawn state — never a pulse, per the speed constraint) as the
-  signature surface; VST3 class UID unchanged. (Gated.)
+  rows, waveform, segmented controls) in the B (Neon Console) palette — **REAPER-grey
+  neutrals** (`bg/base` `#2b2b2b` / `bg/panel` `#333333` / `bg/cell` `#3a3a3a`) with the
+  **three pastel accents** (primary lime = live layer; secondary teal / tertiary purple =
+  categorical); add hover/pressed/drag states. (Gated.)
+- [ ] Apply **Direction C's pastel spectral treatment to the keyboard strip** (hue-mapped
+  zones as a pastel sweep anchored on the three accents, glow-on-active as a static drawn
+  state — never a pulse, per the speed constraint) as the signature surface; VST3 class UID
+  unchanged. (Gated.)
 
 ## Phase L — sequencing
 ```