docs: close out Phase L L3 — archive to COMPLETED, mark landed in design-language doc

L3 (VST editor + embed-strip restyle) is on dev. Append its COMPLETED entry
and flip visual-design-language.md §5.3/5.4 from GATED to landed / Phase L
complete. PLAN.md + CONTEXT.md L3 edits already landed via the S-VIEW commit.

COMPLETED.md

@@ -1484,6 +1484,57 @@ placement behavior; the "capture ≠ placement" principle is untouched.
 
 ---
 
+## L3 — VST editor + embed-strip restyle
+**Goal:** Bring the ReaSampler 9000 VST editor (`IPlugView` LICE surface,
+`reasampler_editor.cpp`) and the S6 embed strip (`reasampler_embed.cpp`) up to the
+settled-and-revised **B + three-accent pastel** look via the L1 kit: kit cached-font
+`text()` (the kit's current face — no font change), kit component draws, the
+**REAPER-grey neutrals** (`bg/base #2b2b2b` / `bg/panel #333333` / `bg/cell #3a3a3a`)
+with the **three pastel accents** (primary lime / secondary teal / tertiary purple), the
+**pastel spectral keyboard strip + zone bars** (active zone lifts to `accent/primary` +
+a static glow) as the signature surface, and hover/pressed/drag interaction states
+throughout. Merged as `c53683e`. **L3 was the last remaining Phase L point — Phase L
+is now complete (L1, L2, L3, L4, L5, L6, L7 all landed).**
+**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).
+
+- [x] Route the VST editor's + embed strip's text through the kit's cached-font
+  `text()`; retire their raw GDI `DrawTextA` path (retired in both shells).
+- [x] Retire the shells' **local pre-L1 palette** — the `kColBackground`/`kColCardBg`/
+  `kColThumb`/… forest-green-on-charcoal constants block in `reasampler_editor.cpp`
+  (and the mirrored constants in `reasampler_embed.cpp`) — and draw every surface
+  through the L1 `theme` roles. One kit, one look; two palettes collapsed to one.
+- [x] Restyle the editor + embed components through the kit (capture-first browser
+  search/tabs/thumbnails, channel toggles, ADSR + pitch sliders, Varispeed/Preserve mode
+  toggles, zone bars, list rows, waveform + start/loop markers, segmented controls) in
+  the B (Neon Console) palette with hover/pressed/drag states throughout.
+- [x] Apply **Direction C's pastel spectral treatment** to the keyboard strip + zone bars:
+  hue-mapped zones as a pastel sweep anchored on the three accents; active zone lifts to
+  `accent/primary` + a static glow (no animation); waveform + loop/start markers drawn
+  through `drawWaveform` + `warn`/accent marker roles; VST3 class UID unchanged.
+
+**Notes/decisions:**
+- **Full restyle, not a born-in-kit no-op.** The Phase S surfaces (`reasampler_editor.cpp`
+  + `reasampler_embed.cpp`) arrived on dev drawing flat `LICE_FillRect` blocks + raw GDI
+  `DrawTextA`, off a local pre-L1 forest-green palette (`kColBackground` etc.) — the
+  coordination contract's "born in the kit" branch did not occur. L3 performed the full
+  restyle and reconciled the two palettes into one.
+- **Shell-side only.** All `src/vst/` UI geometry modules (`editor_geometry`,
+  `keyboard_strip`, `waveform_view`, `capture_browser`, `param_slider`, `browser_scroll`,
+  `embed_strip`) are pure geometry/hit-test — zero LICE, zero draw. L3 touched only the
+  two draw shells; no geometry rework was needed.
+- **Beta title band — textual-only distinction (Daniel, 2026-07-27).** The S18 beta
+  channel title band gets no distinct visual accent; L3 restyles it in the standard B
+  pastel palette and the beta-vs-stable distinction stays purely textual (the
+  channel-derived plugin name via `app_version`, as before). No channel-specific accent
+  color. Closes the one open fork from the L3 readiness review.
+- **VST3 class UID unchanged.** A visual refresh is not a compat event; RT/`process`
+  path untouched; pure geometry modules remained pure throughout.
+
+---
+
 # 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.**