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)

Init. Claimed session 0027 (no in-flight sessions). Verified clean pushed main. Read memory resume pointer (Next /goal = #22).
Gate (§4.3). Confirmed #22 is type/task — a leaf, eligible planning-and-executing anchor (R2); no separate Solution Design required.
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.
Plan (superpowers:writing-plans). 9 TDD tasks → docs/superpowers/plans/2026-06-11-f7-intra-diagram-mermaid-diff.md.
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).
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.
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).
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.
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.

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