docs: archive Phase L L2 to COMPLETED; reconcile CLAUDE.md + PLAN.md

COMPLETED.md

@@ -1273,3 +1273,29 @@ cached-font `text()` — GDI `DrawText` path retired. Double-buffer discipline p
 - [x] **GDI `DrawText` retirement in `bank_panel`**: all panel text now routes through the
   kit's cached-font `text()`; raw GDI `DrawText` path retired (the single biggest
   "temple os → modern" lever).
+
+---
+
+## L2 — dock-panel layout redesign
+**Goal:** Full layout redesign of the `bank_panel` dock window — task-grouped action bar,
+full M11-aware button inventory placed by cluster, entire panel drawn through the L1 kit.
+CONTEXT.md §Phase L (L2 scope). DS-3 (thorough layout redesign, not a light re-skin) is the
+governing settled decision; sequenced after M11 merged.
+**Verify:** CTest green (`action_bar_tests`). The panel renders in the settled B+spectral
+language through the L1 kit — chrome, buttons, tabs, grid cells, dividers all by palette
+role with hover on interactive elements; remaining GDI text retired; single
+`KitColor→LICE_pixel` boundary via the kit's `toLice` (exposed in `draw_kit.h`). Prune
+button remains footer-set-apart + `warn`-colored; grid stays the centerpiece.
+
+- [x] **`action_bar` pure module** (`src/action_bar.{h,cpp}`, `tests/test_action_bar.cpp`,
+  CTest target `action_bar_tests`): task-grouped action-bar layout — clusters (Capture /
+  Placement / Maintenance), per-button label + keybinding micro sub-rects, whole-trailing-
+  button overflow, point→index hit-test. Pure; no LICE or REAPER types. Mirror of
+  `mode_switch`/`bank_grid`/`action_buttons`.
+- [x] **`bank_panel` redesigned**: full M11-aware button inventory placed and grouped by
+  task cluster (Capture: capture item/track, batch items, batch razor, realtime; Placement:
+  insert + insert-conform; Maintenance: re-capture, cancel-realtime); prune remains footer-
+  set-apart + `warn`-colored; grid stays the centerpiece. Entire panel draws through the L1
+  kit (chrome, buttons, tabs, grid cells, dividers) by palette role with hover on
+  interactive elements; remaining GDI text retired; single `KitColor→LICE_pixel` boundary
+  via the kit's `toLice` (now exposed in `draw_kit.h`).