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+# Session 0027.0 — Transcript
+
+> App: vscode-cowriting-plugin
+> Start: 2026-06-11T16-16 (PST)
+> End: 2026-06-11T20-33 (PST)
+> Type: planning-and-executing
+> Posture: autonomous (yolo)
+> Status: **FINALIZED**
+
+## Launch prompt
+
+```
+plan-and-execute #22 (F7 intra-diagram mermaid diffing — node/edge-level diff
+beyond the whole-diagram "changed" badge), per Feature #22.
+```
+
+## Outcome (one line)
+
+Task **#22** — intra-diagram mermaid diffing — shipped to `main` via **PR #28**
+(issue auto-closed); 3 new pure host modules + render wire-in; **189 unit + 38/5
+host E2E** green; design §11 (INV-29..31) + plan archived to the content repo.
+
+## Pre-state
+
+- `main` clean & pushed; Epic #1 + F2–F9 shipped (last: F9 authorship preview,
+  PR #27, session 0026). #22 (F7's deferred intra-diagram task, `type/task`) open.
+- F7 render engine in place: `src/trackChangesModel.ts` (pure block diff, mermaid
+  fences **atomic** per INV-23, whole-diagram "changed" badge) + sealed webview
+  (`media/preview.ts` runs `mermaid.run()`) + `TrackChangesPreviewController`.
+- Carried-in loose ends: session 0024 unfinalized; a stray untracked
+  `specs/coauthoring-out-of-workspace.md` in the code repo working tree.
+
+## Arc (turn by turn)
+
+1. **Init.** Claimed session 0027 (no in-flight sessions). Verified clean pushed
+   `main`. Read memory resume pointer (Next /goal = #22).
+2. **Gate (§4.3).** Confirmed #22 is `type/task` — a leaf, eligible
+   planning-and-executing anchor (R2); no separate Solution Design required.
+3. **Brainstorming (superpowers).** Explored the F7 architecture to ground the
+   design. Resolved the four forks the issue flagged:
+   - **Diff level → parsed-graph** (source-text defeats a *rendered* preview; SVG
+     diff is layout-brittle — §6.7 already rejected it). Parse → diff → re-emit the
+     current source augmented with mermaid's *own* styling directives, keeping the
+     host pure (INV-22) and the webview unchanged (INV-21).
+   - **Layout reflow → accepted** (no position pinning; mermaid exposes none).
+   - Asked the operator the two genuinely-open forks via AskUserQuestion:
+     - **Removed elements → "ghost in place"** (faded/dashed, re-injected at
+       baseline position).
+     - **Diagram scope → "flowchart + sequence"** (broader than my flowchart-only
+       recommendation); all else → v1 badge fallback.
+   - Surfaced a real mermaid constraint: sequence diagrams have **no per-message
+     color hook** → use `rect rgb(...)` tinted bands (the only option).
+   - Wrote the design as **§11** of the F7 spec (content repo) + INV-29..31.
+4. **Plan (superpowers:writing-plans).** 9 TDD tasks → `docs/superpowers/plans/2026-06-11-f7-intra-diagram-mermaid-diff.md`.
+5. **Execute (superpowers:executing-plans, inline).** Feature branch
+   `f7.1-intra-diagram-mermaid-diff`; one commit per task:
+   - `mermaidDiff.ts` (dispatch + `detectDiagramType` + total try/catch fallback;
+     owns `CW_COLORS`).
+   - `mermaidFlowchartDiff.ts` — `parseFlowchart` + `diffFlowchart` →
+     `classDef`/`class`/`linkStyle`, ghost nodes/edges re-injected.
+   - `mermaidSequenceDiff.ts` — `parseSequence` + `diffSequence` (LCS via jsdiff)
+     → `rect` tinted runs, removed messages/participants ghosted.
+   - Wired into `renderOp`'s changed-atomic-mermaid branch (`mermaidFenceBody`
+     helper + `MERMAID_LEGEND`); legend CSS; `renderHtmlFor` E2E seam.
+   - Updated one pre-existing unit test that asserted the *old* v1 badge for a
+     changed flowchart (now augments — exactly what #22 changes).
+6. **Verify & ship.** typecheck clean, 189 unit, 38/5 E2E. PR #28 opened on Gitea
+   (needed the repo-scoped keychain token — the issues-only token lacked
+   `read:repository` scope), merged to `main`, branch deleted, #22 auto-closed.
+7. **Spec reconcile.** The local content clone was 6 commits stale (remote had the
+   *graduated* F7 spec + F8/F9). Aborted a conflicting rebase, reset local to
+   origin, re-applied §11 cleanly onto the current spec, pushed (`1c2844d`).
+8. **Operator Q (mid-finalize):** asked about the macOS "VS Code would like to
+   access data from other apps" prompt → explained it's the TCC cross-app-data
+   gate triggered by my Keychain reads (`security` CLI fetching the Gitea token),
+   not the file edits; gave Allow/Don't-Allow trade-offs.
+9. **Finalize.** Archived the plan to the content repo `plans/` (`6b14de9`);
+   updated memory; published this transcript.
+
+## Cut state
+
+- `main` (code): PR #28 merged (`06d4f87`), clean & pushed. Only the carried-in
+  stray `specs/` dir remains untracked (not this session's).
+- Content repo: F7 spec §11 (`1c2844d`) + archived plan (`6b14de9`) pushed.
+  Untracked `issues/*.md` are pre-existing capture drafts, untouched.
+- Issue #22: **closed**. No open issues remain.
+
+## Deployment pipeline (§9)
+
+**No pipeline stage applies.** This app is a VS Code extension with **no
+flotilla/cloud infra** (`app.json`: code/specs/roadmap/sessions repos only).
+localhost + E2E (host) ran green; there is no PPE/prod deploy stage to gate.
+Done = merge + green tests.
+
+## Deferred decisions
+
+_Autonomous-mode low-confidence calls; none material this session._
+
+- The two product-flavored forks (removed-element treatment, diagram scope) were
+  **not** auto-decided — they were put to the operator via AskUserQuestion and
+  answered (ghost-in-place; flowchart+sequence). Everything else had a clearly
+  preferred answer and was decided autonomously.
+- Updated one pre-existing unit test to the new behavior (judgment call, low risk):
+  a changed flowchart now augments rather than showing the whole-block badge.
+
+## Operator plate (loose ends to pick up)
+
+- Session **0024** still unfinalized (carried since session 0025).
+- Stray untracked `specs/coauthoring-out-of-workspace.md` in the **code** repo —
+  a duplicate of the F8 spec that already lives in the content repo.
+- F9 was never captured as an issue; #21 / #1 issue hygiene.
+- Manual webview-render smoke for F7.1 (`docs/MANUAL-SMOKE-F7.1.md`) not yet run
+  by a human (colors paint — not auto-testable in the sealed sandbox).
+
+## Next /goal
+
+No open issues and no roadmap-driven next feature remain. Suggested next:
+a **capture session** to re-stock the backlog from the deferred F7 follow-ups —
+more mermaid diagram types for #22 (class/state/ER/gantt), preview→source
+scroll-sync, non-markdown rendered views — and to clear the hygiene loose ends
+above. Or pick one deferred item directly to plan-and-execute.
@@ -1,24 +0,0 @@
-# Session 0027.0 — Transcript
-
-> App: vscode-cowriting-plugin
-> Start: 2026-06-11T16-16 (PST)
-> Type: planning-and-executing
-> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
->
-> This file reserves session ID 0027 for vscode-cowriting-plugin. The driver replaces this
-> body with the full transcript and renames the file to its final
-> SESSION-0027.0-TRANSCRIPT-2026-06-11T16-16--<end>.md form at session end.
-
-## Launch prompt
-
-```
-plan-and-execute #22 (F7 intra-diagram mermaid diffing — node/edge-level diff
-beyond the whole-diagram "changed" badge), per Feature #22.
-
-```
-
-## 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._