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+# 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
+
+1. **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).
+2. **Brainstorm:** four design decisions locked (axis=toggle, granularity=inline,
+   scope=both authors, fences=block badge, toggle=segmented header). Wrote +
+   committed the spec; operator approved.
+3. **Claim 0026** (planning-and-executing) before implementation.
+4. **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.
+5. **SLICE-2 (Tasks 3–4):** `AttributionController.spansFor`; preview gains the
+   attribution dep + per-panel mode + `setMode`; `extension.ts` reorder.
+6. **SLICE-3 (Task 5):** webview segmented toggle + legend + `.cw-by-*` CSS.
+7. **SLICE-4 (Tasks 6–7):** host E2E (authorship marks Claude's landed span +
+   track-changes regression) + manual smoke + README.
+8. **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.
diff --git a/sessions/0026/SESSION-0026.0-TRANSCRIPT-2026-06-11T14-29--INPROGRESS.md b/sessions/0026/SESSION-0026.0-TRANSCRIPT-2026-06-11T14-29--INPROGRESS.md
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-# Session 0026.0 — Transcript
-
-> App: vscode-cowriting-plugin
-> Start: 2026-06-11T14-29 (PST)
-> Type: planning-and-executing
-> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
->
-> This file reserves session ID 0026 for vscode-cowriting-plugin. The driver replaces this
-> body with the full transcript and renames the file to its final
-> SESSION-0026.0-TRANSCRIPT-2026-06-11T14-29--<end>.md form at session end.
-
-## Launch prompt
-
-_(launch prompt not captured at claim time)_
-
-## 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._