add sessions/0034/SESSION-0034.0-TRANSCRIPT-2026-06-12T03-28--2026-06-12T03-39.md + replace placeholder/variant SESSION-0034.0-TRANSCRIPT-2026-06-12T03-28--INPROGRESS.md

sessions/0034/SESSION-0034.0-TRANSCRIPT-2026-06-12T03-28--2026-06-12T03-39.md

@@ -0,0 +1,63 @@
+# Session 0034.0 — Transcript
+
+> App: vscode-cowriting-plugin
+> Start: 2026-06-12T03-28 (PST)
+> End: 2026-06-12T03-39 (PST)
+> Type: planning-and-executing
+> Posture: autonomous (yolo)
+> Status: **FINALIZED**
+
+## Launch prompt
+
+`/goal next` → resolved from memory to: plan-and-execute #38 (undo renders wrong
+marks in the F10 review preview, P1).
+
+## Plan
+
+Fix #38 (P1). Root cause (confirmed by reading + E2E repro): attribution attributed
+every non-seam change to currentAuthor() (always human), ignoring e.reason — so
+undo/redo re-inserting text falsely colored it human. Fix: geometry-only span
+reconciliation on undo/redo (no fresh attribution). E2E repro → minimal fix → green.
+
+## Arc (systematic debugging)
+
+- **Phase 1 (root cause):** traced the three data sources feeding the pure
+  `renderReview` (baseline diff / F3 author spans / F4 proposals). Read
+  `attributionController.onDidChange` + `attributionTracker.applyChange`: every
+  non-seam change is attributed to `currentAuthor()` (always human) and `e.reason`
+  is ignored. Proposals only shift (not the culprit). Disk-sync guard masks
+  undo-to-saved-state → bug is on mid-edit undo.
+- **Reproduce:** wrote `test/e2e/suite/undoMarks.test.ts` driving edit→edit→undo
+  (mid-edit, buffer stays dirty). Confirmed FAILING: after undo, `spansFor` =
+  `[{start:6,end:12,author:"human"}]` over restored "bravo " — false attribution.
+- **Fix (Phase 4):** `applyChange` gains `attributeInserted` (default true);
+  `onDidChange` sets it false and skips seam matching when
+  `e.reason === Undo|Redo`. Restored text stays neutral, not falsely human.
+- **Verify:** repro passes; +3 unit tests for the geometric-only path. 197 unit +
+  50 E2E green; typecheck clean.
+- **Shipped:** PR #39 merged → main; issue #38 closed.
+- **Follow-up filed #40** (type/task, P3): restore *exact* prior provenance on
+  undo/redo (the fix leaves undone text neutral, not its original author color);
+  needs an attribution history stack synced to the editor undo stack.
+
+## Cut state
+
+`main` clean + synced; 0 open PRs. #38 fixed and closed; #40 filed. 197 unit + 50
+E2E green. No deploy pipeline (VS Code extension).
+
+## Deferred decisions
+
+1. **Scoped the fix to "neutral on undo," not exact provenance restoration.**
+   Alternative: an attribution history stack that restores each char's original
+   author on undo/redo. Why deferred: synchronizing such a stack with VS Code's
+   undo (which coalesces edits) is fragile, and the neutral fix already removes the
+   reported misleading marks. Tracked as #40 (P3) so it isn't lost.
+
+## Next /goal
+
+```
+/goal plan-and-execute #33 (intra-emphasis sentinel hardening) via the token-aware HTML-post-process approach recommended in the issue #33 comment, per specs/coauthoring-interactive-review.md §1.7/§9
+```
+
+(Backlog: #40 undo provenance (P3); #32 scroll-sync (feature, needs a Solution
+Design); #35 repo rename (outward, operator timing).)

sessions/0034/SESSION-0034.0-TRANSCRIPT-2026-06-12T03-28--INPROGRESS.md

@@ -1,23 +0,0 @@
-# Session 0034.0 — Transcript
-
-> App: vscode-cowriting-plugin
-> Start: 2026-06-12T03-28 (PST)
-> Type: planning-and-executing
-> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
->
-> This file reserves session ID 0034 for vscode-cowriting-plugin. The driver replaces this
-> body with the full transcript and renames the file to its final
-> SESSION-0034.0-TRANSCRIPT-2026-06-12T03-28--<end>.md form at session end.
-
-## Launch prompt
-
-```
-/goal plan-and-execute #38 (undo renders wrong marks in the F10 review preview, P1) — reproduce the wrong-marks-after-undo case, find which layer (F3 attribution spans / F4 proposal anchors) goes stale on undo and reconcile it, confirm across edit→undo→redo
-
-```
-
-## Deferred decisions
-
-_Autonomous-mode low-confidence calls the driver made and would have
-liked operator input on. Appended as the session runs; surfaced at
-finalize. Empty if none._