add sessions/0043/SESSION-0043.0-TRANSCRIPT-2026-06-13T07-18--2026-06-13T07-38.md + replace placeholder/variant SESSION-0043.0-TRANSCRIPT-2026-06-13T07-18--INPROGRESS.md

sessions/0043/SESSION-0043.0-TRANSCRIPT-2026-06-13T07-18--2026-06-13T07-38.md

@@ -3,11 +3,9 @@
 > App: vscode-cowriting-plugin
 > Start: 2026-06-13T07-18 (PST)
 > Type: planning-and-executing
-> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
->
-> This file reserves session ID 0043 for vscode-cowriting-plugin. The driver replaces this
-> body with the full transcript and renames the file to its final
-> SESSION-0043.0-TRANSCRIPT-2026-06-13T07-18--<end>.md form at session end.
+> End: 2026-06-13T07-38 (PST)
+> Status: **FINALIZED.**
+> Posture: autonomous (yolo)
 
 ## Launch prompt
 
@@ -62,6 +60,22 @@ block (`diffToBlockHunks`, INV-39 supersedes INV-37; word-precise intra-block
 attribution INV-40; block-insertion anchoring INV-41). Then SLICE-3 — #46
 (accept-all, INV-42).
 
+## Session arc
+
+1. **Gate + claim.** Classified the `/goal` as planning-and-executing; claimed
+   session 0043 (peek showed nothing in flight). Baseline: local `main` was 4
+   behind `origin/main` → fast-forwarded clean.
+2. **Anchor gate (§4.3 R3).** #42 is `type/feature`; its design is the graduated
+   combined Solution Design `specs/coauthoring-document-edit-flow.md` (session
+   0041) → R3 satisfied, proceed.
+3. **Read the spec**, scoped SLICE-1 (reach). Explored the code: `package.json`
+   menus, `editDocument`/`editSelection` handlers, the F11 E2E harness (`setEditTurnForTest`).
+4. **TDD.** Wrote `f12Reach.test.ts` first (red), then wired the menus + tab-URI
+   resolution (green).
+5. **Verified** (tsc clean, 208 unit, 65/5 E2E), self-reviewed the diff, shipped
+   via PR #49 (merged), closed #42, updated memory, checkpoint-published the
+   transcript.
+
 ## Deferred decisions
 
 _Autonomous-mode low-confidence calls the driver made and would have