docs: archive Phase L L7 to COMPLETED; reconcile CLAUDE.md + CONTEXT.md + PLAN.md

COMPLETED.md

@@ -1423,3 +1423,61 @@ targets, no capture/placement behavior change.
 
 **Notes/decisions:**
 - Icons were considered and deferred (not implemented in this pass).
+
+---
+
+## L7 — capture ordering, card metadata, and selection styling
+**Goal:** Three grid-facing improvements to the dock panel, drawn through the L1 kit in the
+settled DS-2 palette. (1) **Persisted deterministic capture order + drag-drop reorder + sparse
+placement:** each bank (and the pool) carries an explicit, persisted per-sample order via a
+per-`Bank` id→slot `SlotMap` in `bank_book`; a card may sit in a slot that leaves earlier slots
+empty (gaps preserved; trailing empty tail trimmed for scroll extent). (2) **Decorative metadata
+over the peaks:** each card overlays capture length as **bars.beats.subdivisions (bottom-left)**
+and **seconds.ms (bottom-right)** in the kit's micro / value-mono type class, `text/dim`. (3)
+**Selection restyle:** a selected card drops the inverted accent-fill and instead draws the
+*normal* cell + an **`accent/tertiary` (pastel purple `#C2AAE8`) border**. No new capture /
+placement behavior; the "capture ≠ placement" principle is untouched.
+
+- [x] **`SlotMap` in `bank_book`:** gap-preserving per-`Bank` id→slot map — persisted
+  deterministic display order; interior gaps preserved / trailing tail trimmed; JSON rides
+  inside the existing `"banks"` blob; pre-L7 migration seeds dense insertion order via
+  `reconcileSlots()` on the load path. `bank_model` / `Sample` untouched by position (position
+  is a per-bank display concern).
+- [x] **`BankBook` mutators:** `reorderSample` (insert-before-shift; same-slot = no-op),
+  `replaceSample` (occupant index-removal via the standard remove path + pool-guard inheritance;
+  no-op on reject), `orderedSampleIds`, `reconcileSlots`. All gap-preserving; deterministic;
+  CTest-covered.
+- [x] **`Sample` meter stamp (ONE sanctioned `Sample` change):** `captureTimeSigNum` /
+  `captureTimeSigDenom` added to `Sample` + JSON round-trip; stamped on both capture paths and
+  refreshed on re-capture via `TimeMap_GetTimeSigAtTime` (API confirmed at build). Old samples
+  with no stamp fall back gracefully (blank musical read-out).
+- [x] **`card_drag` pure module:** gesture precedence — leave-client → OS drag-out;
+  other-bank → move/copy; same-bank → reorder / Alt-over-occupied → replace. Cursor-cue map
+  returned as the pure resolved gesture. Sparse `computeSlotRects` / `hitTestSlot`. SWELL stock
+  cursors chosen at build: Reorder→`IDC_SIZEALL`, Move→`IDC_HAND`, Copy→`IDC_UPARROW`,
+  Replace→`IDC_SIZEWE`. New CTest target `card_drag_tests`.
+- [x] **`card_meta` pure module:** bars.beats.subdivisions from the stamped tempo + meter;
+  seconds.milliseconds rounded. Both blank when the sample is unstamped. New CTest target
+  `card_meta_tests`.
+- [x] **`bank_panel` sparse-grid render:** grid renders in sparse slot order; decorative
+  empty-gap cells drawn for unoccupied slots; every cell↔sample consumer remapped to
+  id-based occupied-ordinal space (selection, keyboard nav — arrows skip gaps, audition,
+  multi-select, delete / re-capture resolution, drags).
+- [x] **`bank_panel` drop dispatch:** reorder / Alt-replace / move-copy drop with one-Ctrl-Z
+  undo via the existing batched undo pattern; per-slot drop highlight (`accent/hot`, doubled
+  outline for replace); SWELL stock cursor cues via `SetCursor` per the pure resolved gesture.
+- [x] **`bank_panel` metadata overlay:** bars.beats bottom-left (Micro), s.ms bottom-right
+  (ValueMono), `TextDim`, decorative / non-interactive.
+- [x] **Selection restyle:** normal cell + `accent/tertiary` purple border; inversion removed;
+  focus ring distinct from the selection border.
+
+**Notes/decisions:**
+- **M9 overlap (awareness note — unchanged intent).** M9 (capture-to-slot-N / insert-slot-N,
+  MIDI-bindable, MPC-style) remains **explicitly deferred (Daniel, 2026-07-26).** The
+  interchangeable-slot substrate L7 builds still eases a future M9 revival but L7 adds **no**
+  slot-numbered capture/insert actions and **no** MIDI bindings. The "plain vs. M9-shaped"
+  sub-fork is closed: plain gap-preserving substrate (F2).
+- **Build-time choices confirmed:** `TimeMap_GetTimeSigAtTime` confirmed at build for the
+  meter stamp; SWELL stock cursors chosen (no custom cursor load/synthesis required);
+  gap navigation = skip gaps (arrow keys skip empty slots); same-slot reorder = no-op.
+- New CTest targets `card_drag_tests`, `card_meta_tests`.