Session 0026.0 — Transcript

App: vscode-cowriting-plugin Start: 2026-06-11T14-29 (PST) · End: 2026-06-11T14-42 (PST) Type: planning-and-executing Driver: Ben Stull (with Claude / Opus 4.8) Status: FINALIZED

Launch prompt

Continuation of the same conversation as session 0025 (which shipped F8). The operator reported friction: "It's not showing the Claude-composed annotations in the preview." Debugging clarified it was a feature gap, not a regression — the F7 preview is author-agnostic by design. This session designed and shipped the fix: F9 — an Authorship mode in the rendered preview.

Pre-state

F8 shipped (session 0025, PR #26); main clean.
Debugging (systematic-debugging) found: renderTrackChanges diffs only baseline vs buffer (no attribution), and the F6 baseline advances on machine-landing (INV-18), so Claude's accepted text reads as "unchanged". → an authorship axis is needed, read from F3.
AskUserQuestion settled the design: a toggle (changes ⟷ authorship), inline char-precise marking, both authors colored (Claude blue / human green), block-level badges for code/mermaid fences, segmented header toggle.

Plan

Brainstormed the design (superpowers:brainstorming) → spec docs/superpowers/specs/2026-06-11-authorship-preview-design.md (INV-26..28). After operator approval, wrote the plan (superpowers:writing-plans) → docs/superpowers/plans/2026-06-11-f9-authorship-preview.md (7 TDD tasks) and executed inline (superpowers:test-driven-development).

Turn-by-turn arc

Debug (read-only): read the full F7 + F3 stack; identified the feature gap + baseline tension. Confirmed with the operator via AskUserQuestion ("mark what Claude wrote" → attribution-aware preview).
Brainstorm: four design decisions locked (axis=toggle, granularity=inline, scope=both authors, fences=block badge, toggle=segmented header). Wrote + committed the spec; operator approved.
Claim 0026 (planning-and-executing) before implementation.
SLICE-1/2 (Tasks 1–2): splitBlocksWithRanges (block source offsets) + pure renderAuthorship — PUA sentinel injection through markdown-it, atomic fences, adjacent-span ordering. 29 model unit tests.
SLICE-2 (Tasks 3–4): AttributionController.spansFor; preview gains the attribution dep + per-panel mode + setMode; extension.ts reorder.
SLICE-3 (Task 5): webview segmented toggle + legend + .cw-by-* CSS.
SLICE-4 (Tasks 6–7): host E2E (authorship marks Claude's landed span + track-changes regression) + manual smoke + README.
Ship: PR #27 merged to main; main synced; 161 unit + 37/5 host E2E green. Plan archived + spec graduated to the content repo.

Notable hiccup: the PUA sentinels are invisible characters — they round-tripped correctly through the Write tool (verified via cat -v), but a couple of test regexes and a doc literal needed explicit ..E003 escapes for clarity.

Cut state

F9 merged to main (PR #27). Spec graduated + plan archived (content repo).
Tests: 161 unit + 37 (with-ws) + 5 (no-ws) host E2E green.
Core files (model.ts, store.ts, mergeArtifacts.ts, diffViewController.ts, baselineStore.ts) untouched; track-changes mode behavior unchanged.
VS Code extension → no PPE/prod stage; done = merge + tests green.

Deferred decisions

F9 typed/built without a captured tracker issue — it came from a conversational bug report; PR #27 carries the record. A retro Feature issue would tidy the tracker.
Inline (not block-level) authorship marking — the operator chose inline precision; the residual risk (a sentinel adjacent to **/_ perturbing that span's markdown) is rare, fails soft to a per-block chip, and hardening is deferred.
Session 0024 still unfinalized — the finalize-on-goal hook flagged it twice; the operator deferred the cleanup (declined a finalize detour). Still an open --INPROGRESS needing an adopt-and-finalize pass. Plus #21/#1 issue-status hygiene.

Next-session prompt

/goal plan-and-execute #22 (F7 intra-diagram mermaid diffing — node/edge-level diff beyond the whole-diagram "changed" badge), per Feature #22

Read f9-authorship-preview-shipped for the render/wiring surface. Consider finalizing session 0024 first (a one-step adopt-and-finalize) and the #21/#1 issue hygiene.

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