Session 0021.0 — Transcript

App: vscode-cowriting-plugin Start: 2026-06-11T08-33 (PST) End: 2026-06-11T11-52 (PST) Type: planning-and-executing Status: FINALIZED Posture: autonomous (yolo)

Launch prompt

/goal Plan and execute Feature #21 (F7 rendered track-changes markdown preview) from the graduated Solution Design at content specs/coauthoring-rendered-preview.md — 4 slices per §7.2, host-E2E tier, no LLM in CI.

Plan

Plan-and-execute F7 (#21) from the graduated Solution Design coauthoring-rendered-preview.md, four slices per §7.2:

SLICE-1 trackChangesModel.ts — vscode-free pure render engine: block diff (LCS by normalized text) + word-level prose refinement + markdown-it render + atomic code/mermaid blocks (INV-22/23). Add markdown-it + diff deps. Vitest suite per §6.8.
SLICE-2 Webview asset + build: media/preview.ts (receive HTML, run mermaid.run(), theme CSS), esbuild second entry → out/media/preview.js bundling mermaid; sealed CSP shell (INV-21).
SLICE-3 TrackChangesPreviewController (vscode layer) + additive F6 onDidChangeBaseline event + package.json command/keybinding (cowriting.showTrackChangesPreview, ctrl+alt+r, markdown-only) + CowritingApi handle + test seam (isOpen/getLastModel); debounced live update.
SLICE-4 Host E2E (open/live/epoch/pin/non-markdown per §6.8) + docs/MANUAL-SMOKE-F7.md + README F7 section.

One PR; host-E2E tier (no browser/deploy stage); no LLM in CI.

Pre-state

Clean main, in sync with origin/main. Epic #1 inner loop (F2–F6) fully shipped; F6 diff-view (#17/#19) was the immediate predecessor. F7's spec coauthoring-rendered-preview.md graduated in session 0020. The implementation plan was written just-in-time from that spec (docs/superpowers/plans/2026-06-11-f7-rendered-track-changes-preview.md).

Turn-by-turn arc

Init. Classified as planning-and-executing; claimed session 0021 (no other sessions in flight). Verified baseline (fast-forwarded main 1 commit), read the F7 spec, resolved content/roadmap repos.
Plan. Wrote the 12-task implementation plan with superpowers:writing-plans (engine → webview → controller → wiring → E2E → docs → verify), self-reviewed against the spec (full INV-20..23 + PUC coverage). Committed on branch f7-rendered-preview.
Execute (TDD, superpowers:executing-plans). Twelve tasks, each test-first where applicable, committed individually:
- T1 deps (markdown-it, diff, mermaid + types).
- T2–T5 src/trackChangesModel.ts (pure engine): splitBlocks → diffBlocks (LCS via jsdiff diffArrays, atomic fences INV-23) → renderTrackChanges (markdown-it + custom mermaid fence rule + word-level prose <ins>/<del>) → injectable per-block renderer + error-chip fallback (PUC-6). 18 vitest cases.
- T6 media/preview.ts + media/preview.css + esbuild second entry (browser IIFE bundling mermaid → out/media/preview.js; CSS imported so esbuild emits out/media/preview.css). Host bundle stayed ~68kb; webview bundle ~7MB (mermaid, isolated as intended).
- T7 additive DiffViewController.onDidChangeBaseline event.
- T8 src/trackChangesPreview.ts — TrackChangesPreviewController (sealed CSP+nonce webview, one panel/markdown doc, debounced live refresh, reuses F6 baseline, no persistence INV-20, test seam isOpen/getLastModel).
- T9 wired into extension.ts (workspace-independent like F6) + CowritingApi
  - package.json command/keybinding (ctrl+alt+r, markdown-only).
- T10 host E2E test/e2e/suite/trackChangesPreview.test.ts (5 cases: open/PUC-1, type/PUC-2, propose+accept epoch advance/PUC-3, pin/PUC-4, non-markdown guard/PUC-6) + fixtures preview.md + notes.txt.
- T11 docs/MANUAL-SMOKE-F7.md + README F7 section.
- T12 full verification.
Verify. typecheck clean; 122 unit passing; 33 (workspace) + 4 (no-workspace) E2E passing (F7's 5 among them); build produces all artifacts; working tree clean (INV-20 — preview wrote nothing to repo/sidecar).
Ship. Pushed branch, created PR #23 via Gitea API, merged (merge commit), synced main, deleted branch local + remote, re-verified main green post-merge.

Cut state

F7 (#21) shipped to main (PR #23, merge commit ce01ef8). Plan archived to the content repo plans/ (0a52159). main clean and in sync. Deferred follow-up #22 (intra-diagram mermaid diffing) remains open.

Deferred decisions

Autonomous-mode low-confidence calls made this session (none blocked progress; all cheap to revisit):

CSP style-src 'unsafe-inline' in the webview shell. Mermaid injects <style> tags into the DOM at runtime, which a nonce/hash can't cover. Chosen: allow inline styles while keeping scripts strictly nonce-gated and local-only (no remote/CDN script source) — INV-21's network seal is intact. Alternative: hash every injected style (impractical for runtime injection). Standard practice for mermaid-in-webview, but flagging the relaxation since it's security-adjacent.
Block-key normalization lowercases + collapses whitespace for diff matching. Consequence: a case-only or whitespace-only edit to a block won't register as a changed block. Chosen: reduce diff noise from reflow/casing. Alternative: case/whitespace-sensitive keys (more literal, noisier). Minor fidelity tradeoff in a pure-preview view.
PR merged as a merge commit (not squash), matching recent repo history (Merge pull request … style). The 12 conventional commits are preserved.
CSS delivered via import "./preview.css" from the webview entry so esbuild emits the sibling out/media/preview.css (single localResourceRoot, one build mechanism) rather than a separate copy step.

Operator plate

F7 is live: Ctrl+Alt+R / "Cowriting: Open Track-Changes Preview" on a markdown doc. Run the manual smoke (docs/MANUAL-SMOKE-F7.md) once to verify the webview's visual rendering (mermaid diagrams, theming) — that layer is intentionally not asserted in the sealed-sandbox E2E.
Deployment pipeline (§9): this app is a non-shippable VS Code extension POC (spec §7.3 — no marketplace publish). There is no deployable UI app / no PPE or prod stage for it; the app's required pipeline tier is host E2E, which ran green. So "completion" = merged + host-E2E green + manual smoke, not a flotilla deploy. Nothing was skipped — there is no cloud stage to run.

Next session

The open follow-up is #22 (intra-diagram mermaid diffing), type/task. The F7 spec §6.7 explicitly flagged it as "a large unscoped design" (diff at the source / parsed-graph / SVG level; layout reflow) — so although typed a task, it is design-heavy and the session may want to scope the approach first.

/goal Plan and execute #22 (F7 intra-diagram mermaid diffing) — extend the F7 track-changes preview beyond the whole-diagram "changed" badge to node/edge-level diffing; spec §6.7 flags it as unscoped (source vs parsed-graph vs SVG, layout reflow), so scope the approach first. Builds on src/trackChangesModel.ts (atomic mermaid blocks, INV-23) + the F7 webview; host-E2E tier, no LLM in CI.

Read first: memory f7-rendered-preview-shipped.md (what shipped + the open follow-ups) and the F7 spec coauthoring-rendered-preview.md §6.7 (the deferred mermaid-diff decision).

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