Lanes delete into the trash — the design pass

User-proposed and ruled 2026-07-29, retiring the design's sole
destructive delete: lane delete becomes a move into .trash/, exactly as
cards move. Full rationale on the Redesign board's Resolved card;
implementation is post-m12 ("Lanes delete into the trash" on the
Backlog) — the docs deliberately lead the code until then.

- 01: kind: lane always present on lane frontmatter (created with the
  lane, healed on touch, never stripped) — discriminates lane from card
  in the flat .trash/, where an empty lane is shape-identical to a
  card; legacy deleted: on lanes is now simply ignored (no migration,
  no notice — backward compatibility deliberately not funded).
- 03: trashed lane = opaque dimmed row with card count, restores whole
  or purges whole; confirms count lane freight; fixed 03's own copy of
  the "native undo restores a permanent delete" contradiction.
- 04: delete staged by place for lanes too (board→trash no dialog,
  trash→permanent confirmed); lane drop on shown trash deletes;
  kind-homogeneous trash selections, ranges skip by kind; ⌘X/⌘V restore
  rides the existing lane-paste rule.
- 10: trashed lane is one flattened element, never a container.
- 13: lane delete inverse = ordinary move back; recreate-from-capture
  retires — no destructive delete remains outside the trash.
- 08: agent guide v6 — lanes trash by move, kind: lane taught.

Claude-Session: https://claude.ai/code/session_01CqjXB7ASoWtbyoGod68k97

DESIGN/08-agent-integration.md

@@ -17,7 +17,8 @@ The app silently maintains a `CLAUDE.md` in every board — a condensed, agent-f
 
 - Creating cards (mkdir UUID, write `index.md`, ordering rules) — plain UTF-8, no BOM, preserving each file's existing line endings (01-storage-format.md's encoding contract).
 - Moving between lanes (folder move), reordering (gapped ranks, only touch the moved item).
-- Deletes — move the card folder into `<root>/.trash/` (top position; never delete a card folder outright unless permanence is meant); colors/icons.
+- Deletes — move the card **or lane** folder into `<root>/.trash/` (top position; never delete a folder outright unless permanence is meant; lanes rejoined 2026-07-29 → guide v6); colors/icons.
+- v6 additionally teaches **`kind: lane`**: lane frontmatter always carries it (include it when creating a lane; stamp it when trashing a lane that lacks it) — it is what tells a trashed lane from a card inside the flat `.trash/` (01-storage-format.md ▸ Deletion).
 - New in the rewrite: **attachments** (the `attachments/` convention, importing files) — including the rule that **card files belong in `attachments/`**: a loose file written beside `index.md` will be relocated there by the app with a notice (01-storage-format.md's loose-file carve-out), so agents should put it there in the first place.
 - New in the rewrite: **`modified-by` self-stamping** — stamp files you write; re-stamp every write *and every move* (the app clears it on its own writes; a bare folder move leaves the card unstamped); self-commit instead when you need exact authorship.
 - New in the rewrite: a pointer to the optional **`CLAUDE.user.md`** (see below), instructing agents to read it when present.