diff --git a/dev-claude-plugin/0073/SESSION-0073.0-TRANSCRIPT-2026-06-12T01-18--INPROGRESS.md b/dev-claude-plugin/0073/SESSION-0073.0-TRANSCRIPT-2026-06-12T01-18--INPROGRESS.md
index b6fc4a9..90f9e5c 100644
--- a/dev-claude-plugin/0073/SESSION-0073.0-TRANSCRIPT-2026-06-12T01-18--INPROGRESS.md
+++ b/dev-claude-plugin/0073/SESSION-0073.0-TRANSCRIPT-2026-06-12T01-18--INPROGRESS.md
@@ -13,7 +13,46 @@
 
 ## Launch prompt
 
-_(launch prompt not captured at claim time)_
+`/goal plan-and-execute SLICE-4 of the design-handoff spec — the wgl-design-handoff
+verb + SKILL.md tying home + link + spec **Design:** backfill + #99 cooperation
+into one motion; closes #93. Per specs/2026-06-11-design-handoff-design.md §7.2`
+
+## Plan
+
+> Anchor: design `specs/2026-06-11-design-handoff-design.md` (v1.0.0, graduated) · §7.2 SLICE-4
+> Anchor issues: #95 (storage/linkage), #93 (spec **Design:** field — closed by this slice)
+> Related: #99 (Gitea-workflow engine — graceful cooperation, INV-4)
+> Eligibility: graduated Solution Design → R2a plan-eligible.
+> Worktree: `worktree-session-0073-design-handoff-slice4` (concurrent 0065 in flight).
+
+SLICE-4 — the `wgl-design-handoff` orchestration verb tying SLICE-2 (home) + SLICE-3
+(link) + spec `**Design:**` backfill + #99 cooperation into one motion (PUC-1/1a/3).
+Bottom-up TDD, offline + fixture-tested (§6.8); reuses `home-design-bundle.sh`,
+`link-design-issue.sh`, `submit-spec.sh`, `gitea-api.sh` unchanged.
+
+1. **Pure backfill transform** — `backfill-spec-design.sh set-field --slice ID
+   --design PATH` (stdin spec → stdout): replace the named slice section's single
+   `**Design:**` line value; idempotent; not-found → error (never silent-insert in
+   the wrong place). The testable core (mirrors SLICE-3's `upsert-body-line`).
+2. **Orchestrator** — `wgl-design-handoff.sh --zip --ticket N [--spec] [--slice]
+   [--ui-designs-ticket M] [--repo] [--dry-run]`: resolve slug (issue title via GET
+   → `--slug` override → zip top-dir peek), then home (SLICE-2, `--slug`) → link
+   (SLICE-3, `--design ui/designs/N-slug/`) → backfill spec (`set-field` →
+   `submit-spec.sh`, status-preserving) → close "UI Designs for #N" ticket
+   (explicit `--ui-designs-ticket` or discover-by-title; INV-4 clean no-op
+   otherwise, never fails the core). Sub-scripts resolved via `CLAUDE_PLUGIN_ROOT`
+   (testable).
+3. **Tests** — `test-design-handoff.sh`: (A) pure transform insert-skip/replace/
+   idempotent/not-found/multi-slice-scoping; (B) orchestrator delegation +
+   slug-from-title via argv-logging stubs + fake gitea-api GET; (C) #99 no-op when
+   no ticket, close when present/named; (D) re-run idempotency.
+4. **Docs** — `skills/wgl-design-handoff/SKILL.md` (DOC-2: the verb + the design
+   loop); plugin `CLAUDE.md` skills inventory (DOC-4).
+5. **Ship** — `plugin.json` 0.54.0 → 0.55.0; lint `--check-bump`; commit; PR; merge.
+   Closes #93 (its doc half shipped SLICE-1; the backfill mechanism is SLICE-4).
+
+No deployable runtime surface — plugin scripts/skills only (§9 reduces to tests +
+lint green, merged, version bumped, re-install at finalize via update-plugin.sh).
 
 ## Deferred decisions