README.md

@@ -196,6 +196,20 @@ the manual smoke, not the sealed-sandbox E2E.
 Design: `vscode-cowriting-plugin-content/specs/coauthoring-rendered-preview.md`.
 Live smoke: [`docs/MANUAL-SMOKE-F7.md`](docs/MANUAL-SMOKE-F7.md).
 
+## F9 — Authorship view in the preview (Feature ~#27)
+
+The rendered preview (F7) gains a second mode, switched by a `[ Track changes |
+Authorship ]` toggle in its header. **Authorship** mode re-renders the current
+document with each span colored by its F3 author — Claude (blue) vs you (green),
+inline and char-precise — with a legend. Unlike track-changes (which diffs against
+the F6 baseline, and so hides Claude's text once the baseline advances past a
+landing), authorship reads F3 attribution directly, so Claude's contributions stay
+visible. Code/mermaid fences carry a block-level author badge (atomic). Read-only,
+sealed webview, no new persistence (INV-26..28).
+
+Design: `docs/superpowers/specs/2026-06-11-authorship-preview-design.md`.
+Live smoke: [`docs/MANUAL-SMOKE-F9.md`](docs/MANUAL-SMOKE-F9.md).
+
 ## F8 — Out-of-workspace authoring (Feature #25)
 
 "Ask Claude to Edit Selection" (and F2 threads / F3 attribution / F4

docs/MANUAL-SMOKE-F9.md

@@ -0,0 +1,21 @@
+# Manual smoke — F9 authorship view in the preview
+
+Confirms the rendered preview's Authorship mode colors Claude's vs your text. One
+live turn hits the SDK.
+
+## Prereqs
+- `npm run build`; launch the Extension Development Host (F5) with `sandbox/` open.
+
+## Steps
+1. Open a markdown file. Open **Cowriting: Open Track-Changes Preview** (`Ctrl+Alt+R`).
+2. The header shows a `[ Track changes | Authorship ]` toggle. It opens in **Track
+   changes** (unchanged behavior).
+3. Select a sentence → **Ask Claude to Edit Selection** → instruct → accept.
+4. Click **Authorship**. Expect: Claude's accepted text is tinted (blue) and your
+   own typing is tinted (green); the header shows a legend (Claude / You). Text you
+   never touched (original content) is plain.
+5. Type a few words yourself, mixing into a Claude sentence. Expect: the colors
+   split mid-paragraph at the exact boundaries.
+6. If the doc has a mermaid or code fence Claude authored, expect the whole fence
+   to carry a small author badge (not per-character).
+7. Flip back to **Track changes**. Expect: the diff view is exactly as before.

docs/superpowers/plans/2026-06-11-f9-authorship-preview.md

@@ -0,0 +1,788 @@
+# F9 Authorship Preview Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Add an **Authorship** mode to the F7 rendered preview — a header toggle that re-renders the current markdown doc with each span colored by its F3 author (Claude blue / human green), inline and char-precise — so a writer can see what Claude composed even after the F6 baseline absorbs it.
+
+**Architecture:** A new pure render engine `renderAuthorship(currentText, authorSpans)` in `src/trackChangesModel.ts` (vscode-free, unit-tested) injects Private-Use-Area sentinels at attribution-span boundaries through markdown-it, then post-processes them into `<span class="cw-by-claude|cw-by-human">`; code/mermaid fences stay atomic with a block-level author badge. `AttributionController.spansFor(document)` supplies the spans (resolving the URI-vs-keyOf key mismatch). `TrackChangesPreviewController` gains a per-panel mode and an attribution dependency; the webview header gets a segmented `[ Track changes | Authorship ]` toggle that posts `setMode` back.
+
+**Tech Stack:** TypeScript, VS Code webview API, `markdown-it`, vitest (unit), `@vscode/test-electron` + mocha (host E2E). Design: `docs/superpowers/specs/2026-06-11-authorship-preview-design.md`.
+
+**Conventions (read first):**
+- The render engine is **vscode-free** and **deterministic** (INV-22/28) — spans are passed as data, tested under vitest like `test/trackChangesModel.test.ts`.
+- Avoid `*/` inside block comments (an earlier F8 hiccup: a `**/` glob closed a comment early). Keep glob examples out of JSDoc.
+- Attribution offsets are char offsets into `document.getText()` — the same string passed to the renderer as `currentText`, so they align.
+- Run unit: `npm test`. Typecheck: `npm run typecheck`. Build: `npm run build`. Host E2E: `npm run test:e2e`.
+- After each task: `npm test` green + `npm run typecheck` clean, then commit.
+
+---
+
+## File Structure
+
+**Modify:**
+- `src/trackChangesModel.ts` — add `AuthorKind`/`AuthorSpan`, `splitBlocksWithRanges`, `renderAuthorship`.
+- `src/attributionController.ts` — add `spansFor(document): AuthorSpan[]`.
+- `src/trackChangesPreview.ts` — attribution dependency; per-panel mode; `setMode` handling; render branch; post `mode`/`legend`.
+- `src/extension.ts` — reorder so attribution exists before the F7 controller; pass it in.
+- `media/preview.ts` — segmented toggle + `acquireVsCodeApi` postMessage; legend vs summary per mode.
+- `media/preview.css` — `.cw-by-claude` / `.cw-by-human`, toggle, legend, fence-badge styles.
+- `README.md` — F9 note.
+
+**Create:**
+- `test/e2e/suite/authorship.test.ts` — host E2E.
+- `docs/MANUAL-SMOKE-F9.md` — manual smoke runbook.
+
+**Untouched:** `renderTrackChanges`/`diffBlocks` behavior (track-changes mode), F6 baseline, F3 capture, the seam, persistence.
+
+---
+
+## Task 1: `splitBlocksWithRanges` (block offsets)
+
+**Files:**
+- Modify: `src/trackChangesModel.ts`
+- Test: `test/trackChangesModel.test.ts`
+
+- [ ] **Step 1: Write the failing test (append to `test/trackChangesModel.test.ts`)**
+
+```typescript
+import { splitBlocksWithRanges } from "../src/trackChangesModel";
+
+describe("splitBlocksWithRanges — block offsets align with the source string", () => {
+  it("each block's [start,end) slices back to its raw from the source", () => {
+    const text = "# Title\n\nA prose paragraph.\n\n```js\ncode()\n```\n";
+    const blocks = splitBlocksWithRanges(text);
+    expect(blocks.map((b) => b.type)).toEqual(["prose", "prose", "code"]);
+    for (const b of blocks) {
+      expect(text.slice(b.start, b.end)).toBe(b.raw);
+    }
+    expect(blocks[1].raw).toBe("A prose paragraph.");
+  });
+
+  it("marks a mermaid fence and preserves its source offsets", () => {
+    const text = "intro\n\n```mermaid\ngraph TD; A-->B;\n```\n";
+    const blocks = splitBlocksWithRanges(text);
+    expect(blocks[1].type).toBe("mermaid");
+    expect(text.slice(blocks[1].start, blocks[1].end)).toBe(blocks[1].raw);
+  });
+});
+```
+
+- [ ] **Step 2: Run to verify it fails**
+
+Run: `npm test -- trackChangesModel`
+Expected: FAIL (`splitBlocksWithRanges` is not exported).
+
+- [ ] **Step 3: Implement `splitBlocksWithRanges` in `src/trackChangesModel.ts`**
+
+Add after `splitBlocks`:
+
+```typescript
+export interface BlockWithRange extends Block {
+  /** char offset of the block's first char in the source string. */
+  start: number;
+  /** char offset one past the block's last char (source.slice(start,end) === raw). */
+  end: number;
+}
+
+/**
+ * Like splitBlocks, but each block carries its [start,end) char range in the
+ * SOURCE string (offsets align with document.getText(), so F3 attribution
+ * offsets map directly). Lines are tracked with their true source offsets
+ * (a trailing CR stays in the line, so \r\n sources keep correct offsets).
+ */
+export function splitBlocksWithRanges(text: string): BlockWithRange[] {
+  // line raw (excluding the \n terminator) + its source start offset.
+  const lines: { raw: string; start: number }[] = [];
+  let from = 0;
+  for (let i = 0; i <= text.length; i++) {
+    if (i === text.length || text[i] === "\n") {
+      lines.push({ raw: text.slice(from, i), start: from });
+      from = i + 1;
+      if (i === text.length) break;
+    }
+  }
+  const out: BlockWithRange[] = [];
+  const range = (lo: number, hi: number): { start: number; end: number } => {
+    const start = lines[lo].start;
+    const end = lines[hi].start + lines[hi].raw.length;
+    return { start, end };
+  };
+  let buf: number[] = []; // indices of buffered prose lines
+  const flushProse = () => {
+    if (buf.length) {
+      const { start, end } = range(buf[0], buf[buf.length - 1]);
+      const raw = text.slice(start, end);
+      if (raw.trim()) out.push({ ...makeBlockRange(raw, "prose"), start, end });
+    }
+    buf = [];
+  };
+  let i = 0;
+  while (i < lines.length) {
+    const line = lines[i].raw;
+    const fence = line.match(/^(\s*)(`{3,}|~{3,})(.*)$/);
+    if (fence) {
+      flushProse();
+      const marker = fence[2][0];
+      const info = fence[3].trim().split(/\s+/)[0].toLowerCase();
+      const open = i;
+      i++;
+      while (i < lines.length) {
+        const closed = lines[i].raw.trim().startsWith(marker.repeat(3));
+        i++;
+        if (closed) break;
+      }
+      const close = i - 1;
+      const { start, end } = range(open, close);
+      const raw = text.slice(start, end);
+      out.push({ ...makeBlockRange(raw, info === "mermaid" ? "mermaid" : "code"), start, end });
+      continue;
+    }
+    if (line.trim() === "") {
+      flushProse();
+      i++;
+      continue;
+    }
+    buf.push(i);
+    i++;
+  }
+  flushProse();
+  return out;
+}
+
+function makeBlockRange(raw: string, type: BlockType): Block {
+  return makeBlock(raw, type);
+}
+```
+
+(`makeBlockRange` is a thin alias so the spread `{ ...makeBlockRange(...), start, end }` reads clearly; it reuses the existing `makeBlock`.)
+
+- [ ] **Step 4: Run to verify it passes**
+
+Run: `npm test -- trackChangesModel`
+Expected: PASS.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/trackChangesModel.ts test/trackChangesModel.test.ts
+git commit -m "feat(f9): splitBlocksWithRanges — block offsets aligned to the source"
+```
+
+---
+
+## Task 2: `renderAuthorship` — inline spans + atomic fences
+
+**Files:**
+- Modify: `src/trackChangesModel.ts`
+- Test: `test/trackChangesModel.test.ts`
+
+- [ ] **Step 1: Write the failing tests (append)**
+
+```typescript
+import { renderAuthorship, type AuthorSpan } from "../src/trackChangesModel";
+
+const spanAt = (text: string, sub: string, author: "claude" | "human"): AuthorSpan => {
+  const start = text.indexOf(sub);
+  return { start, end: start + sub.length, author };
+};
+
+describe("renderAuthorship", () => {
+  it("empty spans → plain render (no author wrappers)", () => {
+    const text = "# Hi\n\nplain paragraph.\n";
+    const html = renderAuthorship(text, []);
+    expect(html).not.toContain("cw-by-claude");
+    expect(html).not.toContain("cw-by-human");
+    expect(html).toContain("plain paragraph.");
+  });
+
+  it("wraps a single Claude span inline", () => {
+    const text = "The cat sat on the mat.\n";
+    const html = renderAuthorship(text, [spanAt(text, "cat sat", "claude")]);
+    expect(html).toContain('<span class="cw-by-claude">cat sat</span>');
+  });
+
+  it("marks two authors in one paragraph at exact boundaries", () => {
+    const text = "Alpha beta gamma.\n";
+    const html = renderAuthorship(text, [
+      spanAt(text, "Alpha", "human"),
+      spanAt(text, "gamma", "claude"),
+    ]);
+    expect(html).toContain('<span class="cw-by-human">Alpha</span>');
+    expect(html).toContain('<span class="cw-by-claude">gamma</span>');
+  });
+
+  it("clips a span to its block (does not bleed across blocks)", () => {
+    const text = "Para one.\n\nPara two.\n";
+    // a span covering the whole text; each block wraps only its own slice
+    const html = renderAuthorship(text, [{ start: 0, end: text.length, author: "claude" }]);
+    expect(html).toContain('<span class="cw-by-claude">Para one.</span>');
+    expect(html).toContain('<span class="cw-by-claude">Para two.</span>');
+  });
+
+  it("a code fence overlapping a span gets a block badge, NOT inner sentinels (atomic)", () => {
+    const text = "```js\nconst x = 1;\n```\n";
+    const html = renderAuthorship(text, [{ start: 0, end: text.length, author: "claude" }]);
+    expect(html).toContain("cw-by-claude");
+    expect(html).toContain("cw-badge");
+    expect(html).not.toContain(""); // no sentinel leaked into the code
+    expect(html).toContain("const x = 1;");
+  });
+
+  it("a mermaid fence authored by Claude renders as a diagram with a badge", () => {
+    const text = "```mermaid\ngraph TD; A-->B;\n```\n";
+    const html = renderAuthorship(text, [{ start: 0, end: text.length, author: "claude" }]);
+    expect(html).toContain('pre class="mermaid"');
+    expect(html).toContain("cw-by-claude");
+    expect(html).toContain("cw-badge");
+  });
+
+  it("is deterministic", () => {
+    const text = "Stable input paragraph.\n";
+    const spans: AuthorSpan[] = [spanAt(text, "input", "claude")];
+    expect(renderAuthorship(text, spans)).toBe(renderAuthorship(text, spans));
+  });
+});
+```
+
+- [ ] **Step 2: Run to verify it fails**
+
+Run: `npm test -- trackChangesModel`
+Expected: FAIL (`renderAuthorship`/`AuthorSpan` not exported).
+
+- [ ] **Step 3: Implement in `src/trackChangesModel.ts`**
+
+```typescript
+export type AuthorKind = "claude" | "human";
+export interface AuthorSpan {
+  start: number;
+  end: number;
+  author: AuthorKind;
+}
+
+// Private-Use-Area sentinels (never appear in real content; markdown-it passes
+// them through as plain text). Paired open/close per author.
+const SENT = {
+  claude: { open: "", close: "" },
+  human: { open: "", close: "" },
+} as const;
+
+function authorBadge(authors: Set<AuthorKind>): { cls: string; label: string } | null {
+  if (authors.size === 0) return null;
+  if (authors.size > 1) return { cls: "cw-mixed", label: "mixed" };
+  const only = [...authors][0];
+  return only === "claude"
+    ? { cls: "cw-by-claude", label: "Claude" }
+    : { cls: "cw-by-human", label: "You" };
+}
+
+/** Inject paired sentinels into a prose block's raw text for the spans clipped to it. */
+function injectSentinels(raw: string, blockStart: number, spans: AuthorSpan[]): string {
+  // Build insertions as (localOffset, marker); apply right-to-left so offsets stay valid.
+  const inserts: { at: number; marker: string }[] = [];
+  for (const s of spans) {
+    const lo = Math.max(0, s.start - blockStart);
+    const hi = Math.min(raw.length, s.end - blockStart);
+    if (hi <= lo) continue;
+    inserts.push({ at: lo, marker: SENT[s.author].open });
+    inserts.push({ at: hi, marker: SENT[s.author].close });
+  }
+  // Close markers must come BEFORE open markers at the same offset to keep nesting
+  // tidy; otherwise sort by offset descending and, at equal offset, close first.
+  inserts.sort((a, b) => (b.at - a.at) || (isClose(a.marker) ? -1 : 1));
+  let out = raw;
+  for (const ins of inserts) out = out.slice(0, ins.at) + ins.marker + out.slice(ins.at);
+  return out;
+}
+function isClose(m: string): boolean {
+  return m === SENT.claude.close || m === SENT.human.close;
+}
+
+/** Replace the rendered sentinels with author <span> tags. */
+function sentinelsToSpans(html: string): string {
+  return html
+    .split(SENT.claude.open).join('<span class="cw-by-claude">')
+    .split(SENT.claude.close).join("</span>")
+    .split(SENT.human.open).join('<span class="cw-by-human">')
+    .split(SENT.human.close).join("</span>");
+}
+
+/**
+ * Pure authorship render (INV-26/28): the CURRENT text with each F3-attributed
+ * span colored by author. Prose blocks get inline `<span class="cw-by-*">`;
+ * code/mermaid fences stay ATOMIC (INV-27) — an overlapping span yields a
+ * block-level author badge, never inner sentinels. Deterministic.
+ */
+export function renderAuthorship(
+  currentText: string,
+  spans: AuthorSpan[],
+  opts: RenderOptions = {},
+): string {
+  const render = opts.render ?? defaultRender;
+  const safe = (src: string): string => {
+    try {
+      return render(src);
+    } catch (err) {
+      return chip(err instanceof Error ? err.message : String(err));
+    }
+  };
+  return splitBlocksWithRanges(currentText)
+    .map((b) => {
+      const overlapping = spans.filter((s) => s.end > b.start && s.start < b.end);
+      if (b.type !== "prose") {
+        const badge = authorBadge(new Set(overlapping.map((s) => s.author)));
+        const inner = safe(b.raw);
+        if (!badge) return `<div class="cw-blk">${inner}</div>`;
+        return `<div class="cw-blk ${badge.cls}"><span class="cw-badge">${badge.label}</span>${inner}</div>`;
+      }
+      const injected = injectSentinels(b.raw, b.start, overlapping);
+      return `<div class="cw-blk">${sentinelsToSpans(safe(injected))}</div>`;
+    })
+    .join("\n");
+}
+```
+
+- [ ] **Step 4: Run to verify it passes**
+
+Run: `npm test -- trackChangesModel`
+Expected: PASS. If the inline-span test fails because markdown-it wraps prose in `<p>`, the assertion still holds (`<span ...>cat sat</span>` appears inside the `<p>`). If a sentinel survives in output, check `sentinelsToSpans` ordering.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/trackChangesModel.ts test/trackChangesModel.test.ts
+git commit -m "feat(f9): renderAuthorship — inline author spans + atomic fence badges (INV-26/27/28)"
+```
+
+---
+
+## Task 3: `AttributionController.spansFor`
+
+**Files:**
+- Modify: `src/attributionController.ts`
+
+- [ ] **Step 1: Add the method**
+
+In `src/attributionController.ts`, import the type and add a public method near `getSpans`:
+
+```typescript
+import type { AuthorSpan } from "./trackChangesModel";
+```
+
+```typescript
+  /**
+   * F9: the document's live attribution as authorship spans for the preview —
+   * current-buffer char ranges mapped to author kind (agent→claude). Computes
+   * the document key internally (so callers pass a TextDocument, not the key).
+   */
+  spansFor(document: vscode.TextDocument): AuthorSpan[] {
+    return this.getSpans(this.keyOf(document)).map((s) => ({
+      start: s.range.start,
+      end: s.range.end,
+      author: s.authorKind === "agent" ? "claude" : "human",
+    }));
+  }
+```
+
+- [ ] **Step 2: Verify typecheck**
+
+Run: `npm run typecheck`
+Expected: clean.
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add src/attributionController.ts
+git commit -m "feat(f9): AttributionController.spansFor — authorship spans for the preview"
+```
+
+---
+
+## Task 4: Wire mode + attribution into the preview controller
+
+**Files:**
+- Modify: `src/trackChangesPreview.ts`, `src/extension.ts`
+
+- [ ] **Step 1: Controller — attribution dep, mode state, render branch, setMode**
+
+In `src/trackChangesPreview.ts`:
+
+Imports + fields:
+```typescript
+import { renderTrackChanges, renderAuthorship, diffBlocks, type BlockOp } from "./trackChangesModel";
+import type { AttributionController } from "./attributionController";
+```
+Add a per-panel mode map field:
+```typescript
+  private readonly mode = new Map<string, "changes" | "authorship">();
+```
+Constructor — add the attribution param (after `extensionUri`):
+```typescript
+  constructor(
+    private readonly diffView: DiffViewController,
+    private readonly extensionUri: vscode.Uri,
+    private readonly attribution: AttributionController,
+  ) {
+```
+
+In `show(...)`, after creating the panel, wire incoming messages (the toggle). Add to the `panel.onDidDispose` registration area:
+```typescript
+    panel.webview.onDidReceiveMessage(
+      (m: { type?: string; mode?: "changes" | "authorship" }) => {
+        if (m?.type === "setMode" && (m.mode === "changes" || m.mode === "authorship")) {
+          this.mode.set(key, m.mode);
+          this.refresh(document);
+        }
+      },
+      null,
+      this.disposables,
+    );
+```
+
+Rewrite `refresh(document)` to branch on mode:
+```typescript
+  refresh(document: vscode.TextDocument): void {
+    const key = document.uri.toString();
+    const panel = this.panels.get(key);
+    if (!panel) return;
+    const mode = this.mode.get(key) ?? "changes";
+    const current = document.getText();
+    if (mode === "authorship") {
+      const spans = this.attribution.spansFor(document);
+      void panel.webview.postMessage({
+        type: "render",
+        mode,
+        html: renderAuthorship(current, spans),
+        legend: { claude: spans.some((s) => s.author === "claude"), human: spans.some((s) => s.author === "human") },
+      });
+      this.lastModel.set(key, diffBlocks(this.diffView.getBaseline(key)?.text ?? current, current));
+      return;
+    }
+    const baseline = this.diffView.getBaseline(key);
+    const baselineText = baseline?.text ?? current;
+    const ops = diffBlocks(baselineText, current);
+    this.lastModel.set(key, ops);
+    const summary = {
+      added: ops.filter((o) => o.kind === "added").length,
+      removed: ops.filter((o) => o.kind === "removed").length,
+      changed: ops.filter((o) => o.kind === "changed").length,
+    };
+    void panel.webview.postMessage({
+      type: "render",
+      mode,
+      html: renderTrackChanges(baselineText, current),
+      epoch: this.epochLabel(baseline),
+      summary,
+    });
+  }
+```
+
+Add a test seam for the current mode (used by E2E):
+```typescript
+  getMode(uriString: string): "changes" | "authorship" {
+    return this.mode.get(uriString) ?? "changes";
+  }
+  setMode(uriString: string, mode: "changes" | "authorship"): void {
+    this.mode.set(uriString, mode);
+    const doc = vscode.workspace.textDocuments.find((d) => d.uri.toString() === uriString);
+    if (doc) this.refresh(doc);
+  }
+```
+
+- [ ] **Step 2: extension.ts — reorder + pass attribution**
+
+In `src/extension.ts`, the F7 controller is currently constructed in the F6/F7 block (before the authoring stack). Move the `TrackChangesPreviewController` construction to AFTER `attributionController` is created, and pass it:
+
+1. Delete the existing block:
+```typescript
+  const trackChangesPreviewController = new TrackChangesPreviewController(
+    diffViewController,
+    context.extensionUri,
+  );
+  context.subscriptions.push(trackChangesPreviewController);
+```
+2. Re-create it right after `const attributionController = new AttributionController(...)` + its `context.subscriptions.push(attributionController);`:
+```typescript
+  // --- F7: rendered track-changes preview (Feature #21) + F9 authorship mode ---
+  // Constructed after attribution so the authorship view can read F3 spans.
+  const trackChangesPreviewController = new TrackChangesPreviewController(
+    diffViewController,
+    context.extensionUri,
+    attributionController,
+  );
+  context.subscriptions.push(trackChangesPreviewController);
+```
+(The `CowritingApi` return already includes `trackChangesPreviewController` — unchanged. The F6 `diffViewController` stays where it is.)
+
+- [ ] **Step 3: Verify typecheck + unit**
+
+Run: `npm run typecheck && npm test`
+Expected: clean + 150+ tests green (Tasks 1–3 added tests).
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add src/trackChangesPreview.ts src/extension.ts
+git commit -m "feat(f9): preview gains authorship mode + attribution dep + setMode wiring"
+```
+
+---
+
+## Task 5: Webview toggle, legend, and CSS
+
+**Files:**
+- Modify: `src/trackChangesPreview.ts` (shell HTML), `media/preview.ts`, `media/preview.css`
+
+- [ ] **Step 1: Shell HTML — add the segmented toggle + legend slot**
+
+In `src/trackChangesPreview.ts` `shellHtml(...)`, replace the `<div id="cw-header">…</div>` with:
+```html
+  <div id="cw-header">
+    <div id="cw-mode" role="group">
+      <button id="cw-mode-changes" class="cw-seg cw-seg-on" data-mode="changes">Track changes</button>
+      <button id="cw-mode-authorship" class="cw-seg" data-mode="authorship">Authorship</button>
+    </div>
+    <span id="cw-epoch">Track changes</span>
+    <span id="cw-summary"></span>
+    <span id="cw-legend" hidden></span>
+  </div>
+```
+
+- [ ] **Step 2: `media/preview.ts` — post setMode; render per mode**
+
+Replace the message interface + handler and add the toggle wiring:
+```typescript
+interface RenderMessage {
+  type: "render";
+  mode: "changes" | "authorship";
+  html: string;
+  epoch?: string;
+  summary?: { added: number; removed: number; changed: number };
+  legend?: { claude: boolean; human: boolean };
+}
+
+const vscodeApi = acquireVsCodeApi();
+const body = document.getElementById("cw-body")!;
+const header = document.getElementById("cw-epoch")!;
+const summary = document.getElementById("cw-summary")!;
+const legend = document.getElementById("cw-legend")!;
+const segs = Array.from(document.querySelectorAll<HTMLButtonElement>(".cw-seg"));
+
+for (const seg of segs) {
+  seg.addEventListener("click", () => {
+    vscodeApi.postMessage({ type: "setMode", mode: seg.dataset.mode });
+  });
+}
+
+window.addEventListener("message", (event: MessageEvent<RenderMessage>) => {
+  const msg = event.data;
+  if (msg?.type !== "render") return;
+  body.innerHTML = msg.html;
+  for (const seg of segs) seg.classList.toggle("cw-seg-on", seg.dataset.mode === msg.mode);
+  const authorship = msg.mode === "authorship";
+  header.hidden = authorship;
+  summary.hidden = authorship;
+  legend.hidden = !authorship;
+  if (authorship) {
+    const parts: string[] = [];
+    if (msg.legend?.claude) parts.push('<span class="cw-by-claude cw-swatch">Claude</span>');
+    if (msg.legend?.human) parts.push('<span class="cw-by-human cw-swatch">You</span>');
+    legend.innerHTML = parts.join(" ") || "no attribution yet";
+  } else {
+    header.textContent = `Track changes since ${msg.epoch ?? ""}`;
+    summary.innerHTML =
+      `<span class="cw-add">+${(msg.summary?.added ?? 0) + (msg.summary?.changed ?? 0)}</span> ` +
+      `<span class="cw-del">−${(msg.summary?.removed ?? 0) + (msg.summary?.changed ?? 0)}</span>`;
+  }
+  void renderMermaid();
+});
+```
+(`acquireVsCodeApi` is a webview global; add `declare function acquireVsCodeApi(): { postMessage(m: unknown): void };` near the top of the file if the type isn't already present.)
+
+- [ ] **Step 3: `media/preview.css` — author + toggle + legend styles**
+
+Append:
+```css
+.cw-by-claude { background: var(--vscode-editorInfo-foreground, rgba(64, 120, 242, 0.18)); text-decoration: none; }
+.cw-by-human { background: var(--vscode-gitDecoration-addedResourceForeground, rgba(46, 160, 67, 0.18)); text-decoration: none; }
+/* Block-level author badges reuse .cw-badge; tint the whole fence block. */
+.cw-blk.cw-by-claude, .cw-blk.cw-by-human, .cw-blk.cw-mixed { outline: 2px solid currentColor; outline-offset: 2px; }
+.cw-seg {
+  background: transparent; color: var(--vscode-foreground);
+  border: 1px solid var(--vscode-panel-border); padding: 0 0.5em; cursor: pointer; font-size: 0.9em;
+}
+.cw-seg:first-child { border-radius: 3px 0 0 3px; }
+.cw-seg:last-child { border-radius: 0 3px 3px 0; border-left: none; }
+.cw-seg-on { background: var(--vscode-button-background); color: var(--vscode-button-foreground); }
+#cw-legend .cw-swatch { padding: 0 0.4em; border-radius: 3px; }
+```
+(Background tints use translucent fallbacks so they read against any theme; the inline spans are intentionally subtle.)
+
+- [ ] **Step 4: Build + verify**
+
+Run: `npm run build && npm run typecheck && npm test`
+Expected: build emits `out/media/preview.js`; typecheck clean; unit green.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/trackChangesPreview.ts media/preview.ts media/preview.css
+git commit -m "feat(f9): webview segmented mode toggle + authorship legend + author CSS"
+```
+
+---
+
+## Task 6: Host E2E
+
+**Files:**
+- Create: `test/e2e/suite/authorship.test.ts`
+
+- [ ] **Step 1: Write the suite**
+
+```typescript
+import * as assert from "assert";
+import * as fs from "fs";
+import * as path from "path";
+import * as vscode from "vscode";
+import type { CowritingApi } from "../../../src/extension";
+
+const WS = process.env.E2E_WORKSPACE!;
+const settle = () => new Promise((r) => setTimeout(r, 300));
+
+async function getApi(): Promise<CowritingApi> {
+  const ext = vscode.extensions.getExtension("benstull.vscode-cowriting-plugin")!;
+  const api = (await ext.activate()) as CowritingApi;
+  assert.ok(api?.trackChangesPreviewController && api?.proposalController, "exports preview + proposal");
+  return api;
+}
+
+// F9 host E2E (no LLM): authorship mode marks Claude's landed span. Owns its own
+// markdown doc, disjoint from the other suites' fixtures.
+suite("F9 authorship preview (host E2E — seam ingress, no LLM)", () => {
+  const DOC_REL = "docs/f9authorship.md";
+  const TARGET = "The sentence Claude will compose over.";
+
+  test("authorship mode marks Claude's accepted edit; track-changes mode still works", async () => {
+    const abs = path.join(WS, DOC_REL);
+    fs.mkdirSync(path.dirname(abs), { recursive: true });
+    fs.writeFileSync(abs, `# F9\n\n${TARGET}\n`, "utf8");
+    const uri = vscode.Uri.file(abs);
+    const doc = await vscode.workspace.openTextDocument(uri);
+    await vscode.window.showTextDocument(doc);
+    await settle();
+    const api = await getApi();
+    const key = uri.toString();
+
+    // open the preview (track-changes mode by default)
+    await vscode.commands.executeCommand("cowriting.showTrackChangesPreview");
+    await settle();
+    assert.ok(api.trackChangesPreviewController.isOpen(key), "preview open");
+    assert.strictEqual(api.trackChangesPreviewController.getMode(key), "changes", "defaults to track-changes");
+
+    // Claude composes via the seam (propose → accept)
+    const start = doc.getText().indexOf(TARGET);
+    const id = await vscode.commands.executeCommand<string>("cowriting.proposeAgentEdit", {
+      uri: key, start, end: start + TARGET.length, newText: "The sentence CLAUDE COMPOSED.", model: "sonnet", sessionId: "e2e-f9", turnId: "turn-f9",
+    });
+    assert.ok(await api.proposalController.acceptById(DOC_REL, id!), "accept applies");
+    await settle();
+
+    // attribution has a Claude span now
+    const claudeSpan = api.attributionController.getSpans(DOC_REL).find((s) => s.authorKind === "agent");
+    assert.ok(claudeSpan, "Claude span recorded by F3");
+
+    // flip to authorship mode → the model should reflect Claude authorship
+    api.trackChangesPreviewController.setMode(key, "authorship");
+    await settle();
+    assert.strictEqual(api.trackChangesPreviewController.getMode(key), "authorship");
+    const spans = api.attributionController.spansFor(doc);
+    assert.ok(spans.some((s) => s.author === "claude"), "spansFor reports a Claude span for the preview");
+
+    // back to track-changes — still functional (regression)
+    api.trackChangesPreviewController.setMode(key, "changes");
+    await settle();
+    assert.strictEqual(api.trackChangesPreviewController.getMode(key), "changes");
+    assert.ok((api.trackChangesPreviewController.getLastModel(key) ?? []).length >= 1, "track-changes model still computed");
+  });
+});
+```
+
+- [ ] **Step 2: Run E2E**
+
+Run: `npm run test:e2e`
+Expected: both EDH passes green (the new F9 suite + all prior suites). Debug per `superpowers:systematic-debugging` if red; do not weaken assertions.
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add test/e2e/suite/authorship.test.ts
+git commit -m "test(f9): host E2E — authorship mode marks Claude's landed span"
+```
+
+---
+
+## Task 7: Docs
+
+**Files:**
+- Create: `docs/MANUAL-SMOKE-F9.md`
+- Modify: `README.md`
+
+- [ ] **Step 1: `docs/MANUAL-SMOKE-F9.md`**
+
+```markdown
+# Manual smoke — F9 authorship view in the preview
+
+Confirms the rendered preview's Authorship mode colors Claude's vs your text. One
+live turn hits the SDK.
+
+## Prereqs
+- `npm run build`; launch the Extension Development Host (F5) with `sandbox/` open.
+
+## Steps
+1. Open a markdown file. Open **Cowriting: Open Track-Changes Preview** (`Ctrl+Alt+R`).
+2. The header shows a `[ Track changes | Authorship ]` toggle. It opens in **Track
+   changes** (unchanged behavior).
+3. Select a sentence → **Ask Claude to Edit Selection** → instruct → accept.
+4. Click **Authorship**. Expect: Claude's accepted text is tinted (blue) and your
+   own typing is tinted (green); the header shows a legend (● Claude / ● You).
+   Text you never touched (original content) is plain.
+5. Type a few words yourself, mixing into a Claude sentence. Expect: the colors
+   split mid-paragraph at the exact boundaries.
+6. If the doc has a mermaid or code fence Claude authored, expect the whole fence
+   to carry a small author badge (not per-character).
+7. Flip back to **Track changes**. Expect: the diff view is exactly as before.
+```
+
+- [ ] **Step 2: README F9 note** — add after the F8 section (match heading style):
+
+```markdown
+## F9 — Authorship view in the preview (Feature ~#27)
+
+The rendered preview (F7) gains a second mode, switched by a `[ Track changes |
+Authorship ]` toggle in its header. **Authorship** mode re-renders the current
+document with each span colored by its F3 author — Claude (blue) vs you (green),
+inline and char-precise — with a legend. Unlike track-changes (which diffs against
+the F6 baseline, and so hides Claude's text once the baseline advances past a
+landing), authorship reads F3 attribution directly, so Claude's contributions stay
+visible. Code/mermaid fences carry a block-level author badge (atomic). Read-only,
+sealed webview, no new persistence (INV-26..28).
+
+Design: `docs/superpowers/specs/2026-06-11-authorship-preview-design.md`.
+Live smoke: [`docs/MANUAL-SMOKE-F9.md`](docs/MANUAL-SMOKE-F9.md).
+```
+
+- [ ] **Step 3: Verify + commit**
+
+```bash
+npm run typecheck && npm test
+git add docs/MANUAL-SMOKE-F9.md README.md
+git commit -m "docs(f9): manual smoke + README authorship-mode note"
+```
+
+---
+
+## Self-Review checklist (run before PR)
+
+- **Spec coverage:** §2 modes → Tasks 4/5; §3.1 render engine → Tasks 1/2; §3.2 wiring → Tasks 3/4/5; §3.3 INV-26/27/28 → Tasks 2/4; §5 testing → Tasks 1/2/6 + smoke; §6 slices → Tasks 1–7.
+- **Untouched:** `renderTrackChanges`/`diffBlocks` logic, F6 baseline, F3 capture, the seam, persistence (`git diff --stat` should show no behavioral change to those).
+- **Done (spec §6):** authorship mode marks Claude (blue) + you (green) inline; header toggle flips modes; fences get a block badge; track-changes unchanged; unit + host E2E green; smoke performed once.
+```

docs/superpowers/specs/2026-06-11-authorship-preview-design.md

@@ -0,0 +1,183 @@
+# Solution Design: Authorship view in the rendered preview (F9)
+
+| | |
+| --- | --- |
+| **Author(s)** | Ben Stull (with Claude) |
+| **Status** | `draft` |
+| **Version** | v0.1.0 |
+| **Anchor** | Feature **F9** (to be captured, ~#27) — builds on F7 `#21` (rendered preview) + F3 `#6` (live attribution). Surfaced as friction during F8 (`#25`) testing: "the preview doesn't show the Claude-composed annotations." |
+
+---
+
+## 1. Problem & context
+
+The F7 rendered track-changes preview (`src/trackChangesPreview.ts` +
+`src/trackChangesModel.ts`) answers **"what changed since the F6 baseline?"** It
+diffs `baselineText` vs the live buffer and renders author-*agnostic*
+`added`/`removed`/`changed` marks. It has never read F3 attribution.
+
+Two facts combine into the friction:
+
+1. The F6 baseline **advances on every machine landing** (INV-18): when a Claude
+   proposal is accepted, its text is folded *into* the baseline, so it then reads
+   as **unchanged** in track-changes.
+2. The preview has **no authorship axis** — it cannot say "Claude composed this
+   span" vs "you did."
+
+So a writer who accepts Claude's edits cannot *see* what Claude contributed in the
+preview. F3 attribution already records exactly that (Claude=`agent` vs human
+spans, char-precise), and F8 made attribution available on **any** authorable doc
+(in-folder / out-of-folder / untitled) — the data exists; the preview just doesn't
+show it.
+
+**Goal:** add an **Authorship** mode to the preview that renders the current
+document with each span colored by its F3 author — Claude (blue) vs you (green) —
+inline and char-precise, reading attribution directly (baseline-independent), so
+Claude's contributions are visible even after the baseline absorbs them.
+
+## 2. Solution overview
+
+The preview gains a **second mode**, switched by a **segmented control in the
+webview header** (`[ Track changes | Authorship ]`); mode is remembered per panel,
+default **Track changes** (today's behavior, unchanged).
+
+- **Track changes mode** — unchanged (`renderTrackChanges(baselineText, current)`).
+- **Authorship mode** — renders the **current buffer** (no baseline diff) via a new
+  pure engine `renderAuthorship(currentText, authorSpans)`, wrapping each
+  attributed span in `<span class="cw-by-claude">` / `<span class="cw-by-human">`.
+  A header **legend** (● Claude / ● You) appears in this mode. Text with no
+  attribution record renders plain.
+
+The two modes are distinct renderings of different axes; authorship mode does **not**
+combine with the baseline diff (no `ins`/`del`, no removed text — there is no diff).
+
+## 3. Technical design
+
+### 3.1 The render engine (pure, vscode-free — extends `trackChangesModel.ts`)
+
+New export `renderAuthorship(currentText: string, spans: AuthorSpan[]): string`,
+where `AuthorSpan = { start: number; end: number; author: "claude" | "human" }`
+(char offsets into `currentText`, non-overlapping). Deterministic (INV-22 extends
+to it): same inputs → identical HTML; no vscode, no DOM.
+
+Algorithm:
+
+1. **Block split with offsets.** Reuse `splitBlocks` but track each block's
+   `[start, end)` char range in `currentText` (add the offsets to the `Block`
+   shape, or a parallel `splitBlocksWithRanges`). Blank-line gaps between blocks
+   are outside any block range (consistent with today's whitespace handling).
+2. **Per block:**
+   - **Prose block:** clip `spans` to the block's range, translate to block-local
+     offsets, and inject paired **sentinel markers** at the local boundaries into
+     the block's raw markdown — four Unicode Private-Use Area code points: `U+E000`
+     (Claude-open) / `U+E001` (Claude-close), `U+E002` (human-open) / `U+E003`
+     (human-close). PUA code points never appear in real content and markdown-it
+     passes them through as plain text. Render the block with the existing
+     markdown-it instance, then **post-process** the HTML: string-replace
+     `U+E000`→`<span class="cw-by-claude">`, `U+E001`→`</span>`,
+     `U+E002`→`<span class="cw-by-human">`, `U+E003`→`</span>`.
+   - **Code / mermaid fence (atomic, INV-23 extends → INV-27):** never inject
+     sentinels inside a fence. If any span overlaps the fence, wrap the rendered
+     fence in a block div carrying the author class + a small badge
+     (`Claude` / `You` / `mixed` when both authors overlap); else render plain.
+3. Concatenate block HTML (same join as `renderTrackChanges`). Each block keeps
+   the existing per-block `try/catch` → error chip, so a render failure degrades
+   to a visible chip, never a throw.
+
+**Known edge case (documented):** a sentinel placed immediately adjacent to active
+emphasis markers (`**`, `_`) can perturb markdown-it's inline parsing for that
+span. Spans from F3 fall on real edit boundaries, so this is rare; v1 accepts it
+(the per-block chip prevents any hard failure) and covers the common cases with
+tests. Snapping span boundaries to token-safe positions is a deferred refinement.
+
+### 3.2 Data source & wiring
+
+- **Spans come from F3.** `AttributionController` already maintains live spans as
+  current-buffer char ranges with author kind (`getSpans(key)` → `RenderedSpan[]`,
+  `authorKind: "human" | "agent"`). Add `spansFor(document): AuthorSpan[]` to
+  `AttributionController` — it computes the document key internally
+  (`this.keyOf(document)` via the F8 router) and maps `agent→"claude"`,
+  `human→"human"`. This resolves the key mismatch (the preview keys panels by
+  `document.uri.toString()`; attribution keys by `keyOf`).
+- **Preview gains an attribution dependency.** `TrackChangesPreviewController`
+  takes `AttributionController` in its constructor. In `extension.ts`, construct
+  the authoring stack (router, guard, attribution) **before** the F7 controller
+  so the dependency is available (a small, safe reorder — F8 already removed the
+  no-root early return, so all controllers are constructed unconditionally).
+- **Mode state & toggle.** The controller holds `mode: Map<key, "changes"|"authorship">`
+  (default `"changes"`). `refresh(document)` renders the panel's current mode:
+  track-changes (existing path) or authorship (`renderAuthorship(current,
+  attribution.spansFor(document))`), posting `{type:"render", html, mode, epoch?,
+  summary?, legend?}`. The webview header shows the segmented toggle; clicking
+  posts `{type:"setMode", mode}` back; the controller updates the map and
+  re-renders. Edits/baseline-changes re-render in the current mode.
+- **Webview (`media/`):** add the segmented toggle to `#cw-header` and a
+  `setMode` message; render the posted HTML into `#cw-body` as today; show/hide
+  the epoch+summary (track-changes) vs the legend (authorship) per mode. CSS adds
+  `.cw-by-claude` (blue) / `.cw-by-human` (green) + the badge/legend styles,
+  themed via VS Code CSS variables (consistent with the existing preview CSS).
+
+### 3.3 Invariants (additions)
+
+- **INV-26 (authorship mode is baseline-independent):** authorship mode renders
+  the **current buffer** colored by F3 author, reading `AttributionController`,
+  never the F6 baseline. Track-changes mode is unchanged. The two are distinct
+  modes, never combined.
+- **INV-27 (fences stay atomic in authorship too):** a code/mermaid fence is never
+  marked inline; an overlapping author span yields a **block-level** author badge
+  (extends INV-23).
+- **INV-28 (pure authorship render):** `renderAuthorship(currentText, spans)` is
+  vscode-free and deterministic (extends INV-22) — spans are passed as data, so it
+  unit-tests with no editor.
+- INV-19/20/21 (read-only preview, sealed webview, no persistence/network) carry
+  over: authorship mode reads attribution, never mutates the document, sidecar, or
+  baseline; no new LLM/network/credential surface.
+
+## 4. Scope
+
+**In scope:** the Authorship mode + header toggle; `renderAuthorship` engine;
+`AttributionController.spansFor`; the preview↔attribution wiring + `extension.ts`
+reorder; webview toggle/legend/CSS; unit + host E2E + a manual-smoke addendum.
+
+**Out of scope / non-goals:** combining authorship with the diff in one view
+(rejected in design — two modes); marking removed text (no diff in authorship
+mode); the "untracked / always-there" third author class (rejected — only Claude &
+human are colored, unattributed renders plain); intra-emphasis sentinel-safety
+hardening (deferred); any change to F3 attribution capture, the seam, persistence,
+or the cross-rung contract.
+
+## 5. Testing strategy
+
+- **Unit (vitest, vscode-free):** `renderAuthorship` —
+  - single Claude span / single human span → correct wrapper class;
+  - two authors in one prose paragraph → exact inline boundaries;
+  - span clipped at a block boundary (spans one block only);
+  - a code fence and a mermaid fence overlapping a span → block-level badge,
+    no inner sentinels (atomic);
+  - adjacent same-author spans; a span covering a whole block;
+  - empty `spans` → plain render (equals markdown-it of the source);
+  - determinism (same inputs → identical HTML).
+- **Host E2E (`@vscode/test-electron`, no LLM, extends the F7 suite):** open the
+  preview on a markdown doc → land a Claude edit via the `proposeAgentEdit` seam +
+  accept → set authorship mode → assert the posted model marks Claude's span as
+  Claude-authored (and a human span as human). Assert track-changes mode still
+  renders as before (regression).
+- **Manual smoke (`docs/MANUAL-SMOKE-F9.md`):** the webview visuals — blue/green
+  colors, the header toggle, the legend, a mixed-author paragraph, a Claude-authored
+  mermaid fence badge — verified by eye (the sealed webview's rendering isn't
+  covered by the E2E).
+
+## 6. Delivery slices
+
+- **SLICE-1** `renderAuthorship` + block-offset split in `trackChangesModel.ts`
+  (the sentinel inject/post-process; atomic fences) + unit tests.
+- **SLICE-2** `AttributionController.spansFor` + wire it into
+  `TrackChangesPreviewController` (constructor dep, `extension.ts` reorder) +
+  per-panel mode state + the `setMode` message.
+- **SLICE-3** webview header toggle + legend + `.cw-by-*` CSS (`media/`).
+- **SLICE-4** host E2E (authorship-mode assertion + track-changes regression) +
+  `docs/MANUAL-SMOKE-F9.md` + README F9 note.
+
+**Done =** authorship mode shows Claude's spans (blue) and yours (green) inline on
+a markdown doc; the header toggle flips modes; code/mermaid fences get a block
+badge; track-changes mode unchanged; unit + host E2E green; smoke performed once.

media/preview.css

@@ -51,3 +51,16 @@ del, .cw-removed {
 }
 pre.mermaid { text-align: center; background: transparent; }
 pre.mermaid[data-cw-error] { color: var(--vscode-errorForeground); }
+
+/* F9 authorship mode — inline author tints + block-level fence badges + toggle. */
+.cw-by-claude { background: var(--vscode-editorInfo-foreground, rgba(64, 120, 242, 0.18)); text-decoration: none; }
+.cw-by-human { background: var(--vscode-gitDecoration-addedResourceForeground, rgba(46, 160, 67, 0.18)); text-decoration: none; }
+.cw-blk.cw-by-claude, .cw-blk.cw-by-human, .cw-blk.cw-mixed { outline: 2px solid currentColor; outline-offset: 2px; background: transparent; }
+.cw-seg {
+  background: transparent; color: var(--vscode-foreground);
+  border: 1px solid var(--vscode-panel-border); padding: 0 0.5em; cursor: pointer; font-size: 0.9em;
+}
+.cw-seg:first-child { border-radius: 3px 0 0 3px; }
+.cw-seg:last-child { border-radius: 0 3px 3px 0; border-left: none; }
+.cw-seg-on { background: var(--vscode-button-background); color: var(--vscode-button-foreground); }
+#cw-legend .cw-swatch { padding: 0 0.4em; border-radius: 3px; }

media/preview.ts

@@ -10,16 +10,29 @@ import mermaid from "mermaid";
 // links it into the sealed shell via asWebviewUri).
 import "./preview.css";
 
+declare function acquireVsCodeApi(): { postMessage(m: unknown): void };
+
 interface RenderMessage {
   type: "render";
+  mode: "changes" | "authorship";
   html: string;
-  epoch: string;
-  summary: { added: number; removed: number; changed: number };
+  epoch?: string;
+  summary?: { added: number; removed: number; changed: number };
+  legend?: { claude: boolean; human: boolean };
 }
 
+const vscodeApi = acquireVsCodeApi();
 const body = document.getElementById("cw-body")!;
 const header = document.getElementById("cw-epoch")!;
 const summary = document.getElementById("cw-summary")!;
+const legend = document.getElementById("cw-legend")!;
+const segs = Array.from(document.querySelectorAll<HTMLButtonElement>(".cw-seg"));
+
+for (const seg of segs) {
+  seg.addEventListener("click", () => {
+    vscodeApi.postMessage({ type: "setMode", mode: seg.dataset.mode });
+  });
+}
 
 function themeFor(): "dark" | "default" {
   return document.body.classList.contains("vscode-dark") ||
@@ -46,9 +59,21 @@ window.addEventListener("message", (event: MessageEvent<RenderMessage>) => {
   const msg = event.data;
   if (msg?.type !== "render") return;
   body.innerHTML = msg.html;
-  header.textContent = `Track changes since ${msg.epoch}`;
-  summary.innerHTML =
-    `<span class="cw-add">+${msg.summary.added + msg.summary.changed}</span> ` +
-    `<span class="cw-del">−${msg.summary.removed + msg.summary.changed}</span>`;
+  for (const seg of segs) seg.classList.toggle("cw-seg-on", seg.dataset.mode === msg.mode);
+  const authorship = msg.mode === "authorship";
+  header.hidden = authorship;
+  summary.hidden = authorship;
+  legend.hidden = !authorship;
+  if (authorship) {
+    const parts: string[] = [];
+    if (msg.legend?.claude) parts.push('<span class="cw-by-claude cw-swatch">Claude</span>');
+    if (msg.legend?.human) parts.push('<span class="cw-by-human cw-swatch">You</span>');
+    legend.innerHTML = parts.join(" ") || "no attribution yet";
+  } else {
+    header.textContent = `Track changes since ${msg.epoch ?? ""}`;
+    summary.innerHTML =
+      `<span class="cw-add">+${(msg.summary?.added ?? 0) + (msg.summary?.changed ?? 0)}</span> ` +
+      `<span class="cw-del">−${(msg.summary?.removed ?? 0) + (msg.summary?.changed ?? 0)}</span>`;
+  }
   void renderMermaid();
 });

src/attributionController.ts

@@ -18,6 +18,7 @@ import { applyChange, coalesce, type LiveSpan } from "./attributionTracker";
 import { minimizeReplace, PendingEditRegistry } from "./pendingEdits";
 import type { VersionGuard } from "./versionGuard";
 import { isAuthorable } from "./workspacePath";
+import type { AuthorSpan } from "./trackChangesModel";
 
 /** Test-facing snapshot of live attribution state for a document. */
 export interface RenderedSpan {
@@ -400,6 +401,19 @@ export class AttributionController implements vscode.Disposable {
   getOrphanCount(docPath: string): number {
     return this.docs.get(docPath)?.orphans.length ?? 0;
   }
+
+  /**
+   * F9: the document's live attribution as authorship spans for the preview —
+   * current-buffer char ranges mapped to author kind (agent→claude). Computes
+   * the document key internally, so callers pass a TextDocument, not the key.
+   */
+  spansFor(document: vscode.TextDocument): AuthorSpan[] {
+    return this.getSpans(this.keyOf(document)).map((s) => ({
+      start: s.range.start,
+      end: s.range.end,
+      author: s.authorKind === "agent" ? "claude" : "human",
+    }));
+  }
   isVisible(): boolean {
     return this.visible;
   }

src/extension.ts

@@ -70,16 +70,6 @@ export function activate(context: vscode.ExtensionContext): CowritingApi | undef
   // still works — PUC-5.
   const globalSidecarStore = new GlobalSidecarStore(baselineStorageDir ?? "");
 
-  // --- F7: rendered track-changes preview (Feature #21) — workspace-INDEPENDENT ---
-  // Like F6, F7 works on any markdown doc (incl. untitled / out-of-folder), so it
-  // is constructed regardless of an open folder and its command is always live.
-  // It reuses the F6 baseline (INV-20) and adds no persistence.
-  const trackChangesPreviewController = new TrackChangesPreviewController(
-    diffViewController,
-    context.extensionUri,
-  );
-  context.subscriptions.push(trackChangesPreviewController);
-
   // --- F8: authoring on ANY document (in-folder, out-of-folder, untitled) ---
   // The router routes per-document: in-workspace file: → the committable repo
   // `.threads/` sidecar (CoauthorStore, INV-2); out-of-folder file: + untitled:
@@ -99,6 +89,17 @@ export function activate(context: vscode.ExtensionContext): CowritingApi | undef
   const attributionController = new AttributionController(sidecarRouter, root, versionGuard);
   context.subscriptions.push(attributionController);
 
+  // --- F7: rendered track-changes preview (Feature #21) + F9 authorship mode ---
+  // Workspace-INDEPENDENT (works on any markdown doc, reuses the F6 baseline,
+  // INV-20). Constructed AFTER attribution so F9's authorship view can read F3
+  // spans (AttributionController.spansFor).
+  const trackChangesPreviewController = new TrackChangesPreviewController(
+    diffViewController,
+    context.extensionUri,
+    attributionController,
+  );
+  context.subscriptions.push(trackChangesPreviewController);
+
   // --- F4: propose/accept (Feature #12) ---
   const proposalController = new ProposalController(sidecarRouter, attributionController, root, versionGuard);
   context.subscriptions.push(proposalController);

src/trackChangesModel.ts

@@ -70,6 +70,76 @@ export function splitBlocks(text: string): Block[] {
   return blocks;
 }
 
+export interface BlockWithRange extends Block {
+  /** char offset of the block's first char in the source string. */
+  start: number;
+  /** char offset one past the block's last char (source.slice(start,end) === raw). */
+  end: number;
+}
+
+/**
+ * Like splitBlocks, but each block carries its [start,end) char range in the
+ * SOURCE string (offsets align with document.getText(), so F3 attribution
+ * offsets map directly). Lines are tracked with their true source offsets — a
+ * trailing CR stays in the line, so a CRLF source keeps correct offsets.
+ */
+export function splitBlocksWithRanges(text: string): BlockWithRange[] {
+  const lines: { raw: string; start: number }[] = [];
+  let from = 0;
+  for (let i = 0; i <= text.length; i++) {
+    if (i === text.length || text[i] === "\n") {
+      lines.push({ raw: text.slice(from, i), start: from });
+      from = i + 1;
+      if (i === text.length) break;
+    }
+  }
+  const rangeOf = (lo: number, hi: number): { start: number; end: number } => ({
+    start: lines[lo].start,
+    end: lines[hi].start + lines[hi].raw.length,
+  });
+  const out: BlockWithRange[] = [];
+  let buf: number[] = [];
+  const flushProse = () => {
+    if (buf.length) {
+      const { start, end } = rangeOf(buf[0], buf[buf.length - 1]);
+      const raw = text.slice(start, end);
+      if (raw.trim()) out.push({ ...makeBlock(raw, "prose"), start, end });
+    }
+    buf = [];
+  };
+  let i = 0;
+  while (i < lines.length) {
+    const line = lines[i].raw;
+    const fence = line.match(/^(\s*)(`{3,}|~{3,})(.*)$/);
+    if (fence) {
+      flushProse();
+      const marker = fence[2][0];
+      const info = fence[3].trim().split(/\s+/)[0].toLowerCase();
+      const open = i;
+      i++;
+      while (i < lines.length) {
+        const closed = lines[i].raw.trim().startsWith(marker.repeat(3));
+        i++;
+        if (closed) break;
+      }
+      const close = i - 1;
+      const { start, end } = rangeOf(open, close);
+      const raw = text.slice(start, end);
+      out.push({ ...makeBlock(raw, info === "mermaid" ? "mermaid" : "code"), start, end });
+      continue;
+    }
+    if (line.trim() === "") {
+      flushProse();
+      i++;
+      continue;
+    }
+    buf.push(i);
+    i++;
+  }
+  flushProse();
+  return out;
+}
+
 export type BlockOp =
   | { kind: "unchanged"; block: Block }
   | { kind: "added"; block: Block }
@@ -196,6 +266,95 @@ function renderOp(op: BlockOp, render: (src: string) => string): string {
   return `<div class="cw-blk ${cls}">${badge}${inner}</div>`;
 }
 
+export type AuthorKind = "claude" | "human";
+export interface AuthorSpan {
+  start: number;
+  end: number;
+  author: AuthorKind;
+}
+
+// Private-Use-Area sentinels (never appear in real content; markdown-it passes
+// them through as plain text). Paired open/close per author.
+const SENT = {
+  claude: { open: "", close: "" },
+  human: { open: "", close: "" },
+} as const;
+
+function isCloseSentinel(m: string): boolean {
+  return m === SENT.claude.close || m === SENT.human.close;
+}
+
+function authorBadge(authors: Set<AuthorKind>): { cls: string; label: string } | null {
+  if (authors.size === 0) return null;
+  if (authors.size > 1) return { cls: "cw-mixed", label: "mixed" };
+  const only = [...authors][0];
+  return only === "claude"
+    ? { cls: "cw-by-claude", label: "Claude" }
+    : { cls: "cw-by-human", label: "You" };
+}
+
+/** Inject paired sentinels into a prose block's raw text for the spans clipped to it. */
+function injectSentinels(raw: string, blockStart: number, spans: AuthorSpan[]): string {
+  const inserts: { at: number; marker: string }[] = [];
+  for (const s of spans) {
+    const lo = Math.max(0, s.start - blockStart);
+    const hi = Math.min(raw.length, s.end - blockStart);
+    if (hi <= lo) continue;
+    inserts.push({ at: lo, marker: SENT[s.author].open });
+    inserts.push({ at: hi, marker: SENT[s.author].close });
+  }
+  // Apply high offset → low so earlier offsets stay valid. At an equal offset
+  // (one span's close == the next's open), apply opens BEFORE closes so the
+  // close ends up left of the open: "…</span><span>…" for adjacent spans.
+  inserts.sort((a, b) => b.at - a.at || (isCloseSentinel(a.marker) ? 1 : -1));
+  let out = raw;
+  for (const ins of inserts) out = out.slice(0, ins.at) + ins.marker + out.slice(ins.at);
+  return out;
+}
+
+/** Replace the rendered sentinels with author <span> tags. */
+function sentinelsToSpans(html: string): string {
+  return html
+    .split(SENT.claude.open).join('<span class="cw-by-claude">')
+    .split(SENT.claude.close).join("</span>")
+    .split(SENT.human.open).join('<span class="cw-by-human">')
+    .split(SENT.human.close).join("</span>");
+}
+
+/**
+ * Pure authorship render (INV-26/28): the CURRENT text with each F3-attributed
+ * span colored by author. Prose blocks get inline `<span class="cw-by-*">`;
+ * code/mermaid fences stay ATOMIC (INV-27) — an overlapping span yields a
+ * block-level author badge, never inner sentinels. Deterministic.
+ */
+export function renderAuthorship(
+  currentText: string,
+  spans: AuthorSpan[],
+  opts: RenderOptions = {},
+): string {
+  const render = opts.render ?? defaultRender;
+  const safe = (src: string): string => {
+    try {
+      return render(src);
+    } catch (err) {
+      return chip(err instanceof Error ? err.message : String(err));
+    }
+  };
+  return splitBlocksWithRanges(currentText)
+    .map((b) => {
+      const overlapping = spans.filter((s) => s.end > b.start && s.start < b.end);
+      if (b.type !== "prose") {
+        const badge = authorBadge(new Set(overlapping.map((s) => s.author)));
+        const inner = safe(b.raw);
+        if (!badge) return `<div class="cw-blk">${inner}</div>`;
+        return `<div class="cw-blk ${badge.cls}"><span class="cw-badge">${badge.label}</span>${inner}</div>`;
+      }
+      const injected = injectSentinels(b.raw, b.start, overlapping);
+      return `<div class="cw-blk">${sentinelsToSpans(safe(injected))}</div>`;
+    })
+    .join("\n");
+}
+
 /** Pure entry point: annotated HTML body for the preview (INV-22). */
 export function renderTrackChanges(
   baselineText: string,

src/trackChangesPreview.ts

@@ -11,7 +11,8 @@ import * as path from "node:path";
 import { randomBytes } from "node:crypto";
 import * as vscode from "vscode";
 import type { DiffViewController } from "./diffViewController";
-import { renderTrackChanges, diffBlocks, type BlockOp } from "./trackChangesModel";
+import type { AttributionController } from "./attributionController";
+import { renderTrackChanges, renderAuthorship, diffBlocks, type BlockOp } from "./trackChangesModel";
 
 const VIEW_TYPE = "cowriting.trackChangesPreview";
 const DEBOUNCE_MS = 150;
@@ -21,10 +22,13 @@ export class TrackChangesPreviewController implements vscode.Disposable {
   private readonly panels = new Map<string, vscode.WebviewPanel>();
   private readonly lastModel = new Map<string, BlockOp[]>();
   private readonly debounces = new Map<string, NodeJS.Timeout>();
+  /** F9: per-panel view mode — track-changes (default) or authorship. */
+  private readonly mode = new Map<string, "changes" | "authorship">();
 
   constructor(
     private readonly diffView: DiffViewController,
     private readonly extensionUri: vscode.Uri,
+    private readonly attribution: AttributionController,
   ) {
     this.disposables.push(
       vscode.commands.registerCommand("cowriting.showTrackChangesPreview", () =>
@@ -70,6 +74,18 @@ export class TrackChangesPreviewController implements vscode.Disposable {
       () => {
         this.panels.delete(key);
         this.lastModel.delete(key);
+        this.mode.delete(key);
+      },
+      null,
+      this.disposables,
+    );
+    // F9: the webview's header toggle posts the chosen mode back.
+    panel.webview.onDidReceiveMessage(
+      (m: { type?: string; mode?: "changes" | "authorship" }) => {
+        if (m?.type === "setMode" && (m.mode === "changes" || m.mode === "authorship")) {
+          this.mode.set(key, m.mode);
+          this.refresh(document);
+        }
       },
       null,
       this.disposables,
@@ -97,14 +113,30 @@ export class TrackChangesPreviewController implements vscode.Disposable {
     if (doc) this.refresh(doc);
   }
 
-  /** Recompute the model + post HTML to the panel (no-op if no panel). */
+  /** Recompute the model + post HTML to the panel for its current mode (no-op if no panel). */
   refresh(document: vscode.TextDocument): void {
     const key = document.uri.toString();
     const panel = this.panels.get(key);
     if (!panel) return;
-    const baseline = this.diffView.getBaseline(key);
-    const baselineText = baseline?.text ?? document.getText(); // no baseline → no marks
+    const mode = this.mode.get(key) ?? "changes";
     const current = document.getText();
+    if (mode === "authorship") {
+      // F9: render the current buffer colored by F3 author, baseline-independent.
+      const spans = this.attribution.spansFor(document);
+      this.lastModel.set(key, diffBlocks(this.diffView.getBaseline(key)?.text ?? current, current));
+      void panel.webview.postMessage({
+        type: "render",
+        mode,
+        html: renderAuthorship(current, spans),
+        legend: {
+          claude: spans.some((s) => s.author === "claude"),
+          human: spans.some((s) => s.author === "human"),
+        },
+      });
+      return;
+    }
+    const baseline = this.diffView.getBaseline(key);
+    const baselineText = baseline?.text ?? current; // no baseline → no marks
     const ops = diffBlocks(baselineText, current);
     this.lastModel.set(key, ops);
     const summary = {
@@ -112,11 +144,11 @@ export class TrackChangesPreviewController implements vscode.Disposable {
       removed: ops.filter((o) => o.kind === "removed").length,
       changed: ops.filter((o) => o.kind === "changed").length,
     };
-    const epoch = this.epochLabel(baseline);
     void panel.webview.postMessage({
       type: "render",
+      mode,
       html: renderTrackChanges(baselineText, current),
-      epoch,
+      epoch: this.epochLabel(baseline),
       summary,
     });
   }
@@ -161,8 +193,13 @@ export class TrackChangesPreviewController implements vscode.Disposable {
 </head>
 <body>
   <div id="cw-header">
+    <div id="cw-mode" role="group">
+      <button id="cw-mode-changes" class="cw-seg cw-seg-on" data-mode="changes">Track changes</button>
+      <button id="cw-mode-authorship" class="cw-seg" data-mode="authorship">Authorship</button>
+    </div>
     <span id="cw-epoch">Track changes</span>
     <span id="cw-summary"></span>
+    <span id="cw-legend" hidden></span>
   </div>
   <div id="cw-body"></div>
   <script nonce="${nonce}" src="${scriptUri}"></script>
@@ -177,6 +214,16 @@ export class TrackChangesPreviewController implements vscode.Disposable {
   getLastModel(uriString: string): BlockOp[] | undefined {
     return this.lastModel.get(uriString);
   }
+  /** F9: current view mode for a panel (default track-changes). */
+  getMode(uriString: string): "changes" | "authorship" {
+    return this.mode.get(uriString) ?? "changes";
+  }
+  /** F9: set the view mode and re-render (the programmatic twin of the header toggle). */
+  setMode(uriString: string, mode: "changes" | "authorship"): void {
+    this.mode.set(uriString, mode);
+    const doc = vscode.workspace.textDocuments.find((d) => d.uri.toString() === uriString);
+    if (doc) this.refresh(doc);
+  }
 
   dispose(): void {
     for (const t of this.debounces.values()) clearTimeout(t);

test/e2e/suite/authorship.test.ts

@@ -0,0 +1,74 @@
+import * as assert from "assert";
+import * as fs from "fs";
+import * as path from "path";
+import * as vscode from "vscode";
+import type { CowritingApi } from "../../../src/extension";
+
+const WS = process.env.E2E_WORKSPACE!;
+const settle = () => new Promise((r) => setTimeout(r, 300));
+
+async function getApi(): Promise<CowritingApi> {
+  const ext = vscode.extensions.getExtension("benstull.vscode-cowriting-plugin")!;
+  const api = (await ext.activate()) as CowritingApi;
+  assert.ok(api?.trackChangesPreviewController && api?.proposalController, "exports preview + proposal");
+  return api;
+}
+
+// F9 host E2E (no LLM): authorship mode reflects Claude's landed span. Owns its
+// own markdown doc, disjoint from the other suites' fixtures.
+suite("F9 authorship preview (host E2E — seam ingress, no LLM)", () => {
+  const DOC_REL = "docs/f9authorship.md";
+  const TARGET = "The sentence Claude will compose over.";
+
+  test("authorship mode marks Claude's accepted edit; track-changes mode still works", async () => {
+    const abs = path.join(WS, DOC_REL);
+    fs.mkdirSync(path.dirname(abs), { recursive: true });
+    fs.writeFileSync(abs, `# F9\n\n${TARGET}\n`, "utf8");
+    const uri = vscode.Uri.file(abs);
+    const doc = await vscode.workspace.openTextDocument(uri);
+    await vscode.window.showTextDocument(doc);
+    await settle();
+    const api = await getApi();
+    const key = uri.toString();
+
+    // open the preview (track-changes mode by default)
+    await vscode.commands.executeCommand("cowriting.showTrackChangesPreview");
+    await settle();
+    assert.ok(api.trackChangesPreviewController.isOpen(key), "preview open");
+    assert.strictEqual(api.trackChangesPreviewController.getMode(key), "changes", "defaults to track-changes");
+
+    // Claude composes via the seam (propose → accept)
+    const start = doc.getText().indexOf(TARGET);
+    const id = await vscode.commands.executeCommand<string>("cowriting.proposeAgentEdit", {
+      uri: key,
+      start,
+      end: start + TARGET.length,
+      newText: "The sentence CLAUDE COMPOSED.",
+      model: "sonnet",
+      sessionId: "e2e-f9",
+      turnId: "turn-f9",
+    });
+    assert.ok(await api.proposalController.acceptById(DOC_REL, id!), "accept applies");
+    await settle();
+
+    // attribution has a Claude span now
+    const claudeSpan = api.attributionController.getSpans(DOC_REL).find((s) => s.authorKind === "agent");
+    assert.ok(claudeSpan, "Claude span recorded by F3");
+
+    // flip to authorship mode → the preview reads a Claude span
+    api.trackChangesPreviewController.setMode(key, "authorship");
+    await settle();
+    assert.strictEqual(api.trackChangesPreviewController.getMode(key), "authorship");
+    const spans = api.attributionController.spansFor(doc);
+    assert.ok(spans.some((s) => s.author === "claude"), "spansFor reports a Claude span for the preview");
+
+    // back to track-changes — still functional (regression)
+    api.trackChangesPreviewController.setMode(key, "changes");
+    await settle();
+    assert.strictEqual(api.trackChangesPreviewController.getMode(key), "changes");
+    assert.ok(
+      (api.trackChangesPreviewController.getLastModel(key) ?? []).length >= 1,
+      "track-changes model still computed",
+    );
+  });
+});

test/trackChangesModel.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect } from "vitest";
-import { splitBlocks, diffBlocks, renderTrackChanges } from "../src/trackChangesModel";
+import { splitBlocks, splitBlocksWithRanges, diffBlocks, renderTrackChanges, renderAuthorship, type AuthorSpan } from "../src/trackChangesModel";
 
 describe("splitBlocks", () => {
   it("splits prose paragraphs on blank lines, dropping empties", () => {
@@ -137,3 +137,98 @@ describe("error chip (PUC-6)", () => {
     expect(html).toContain("<p>Good one.</p>"); // the healthy block still rendered
   });
 });
+
+describe("splitBlocksWithRanges — block offsets align with the source string", () => {
+  it("each block's [start,end) slices back to its raw from the source", () => {
+    const text = "# Title\n\nA prose paragraph.\n\n```js\ncode()\n```\n";
+    const blocks = splitBlocksWithRanges(text);
+    expect(blocks.map((b) => b.type)).toEqual(["prose", "prose", "code"]);
+    for (const b of blocks) {
+      expect(text.slice(b.start, b.end)).toBe(b.raw);
+    }
+    expect(blocks[1].raw).toBe("A prose paragraph.");
+  });
+
+  it("marks a mermaid fence and preserves its source offsets", () => {
+    const text = "intro\n\n```mermaid\ngraph TD; A-->B;\n```\n";
+    const blocks = splitBlocksWithRanges(text);
+    expect(blocks[1].type).toBe("mermaid");
+    expect(text.slice(blocks[1].start, blocks[1].end)).toBe(blocks[1].raw);
+  });
+});
+
+describe("renderAuthorship", () => {
+  const spanAt = (text: string, sub: string, author: "claude" | "human"): AuthorSpan => {
+    const start = text.indexOf(sub);
+    return { start, end: start + sub.length, author };
+  };
+
+  it("empty spans → plain render (no author wrappers)", () => {
+    const text = "# Hi\n\nplain paragraph.\n";
+    const html = renderAuthorship(text, []);
+    expect(html).not.toContain("cw-by-claude");
+    expect(html).not.toContain("cw-by-human");
+    expect(html).toContain("plain paragraph.");
+  });
+
+  it("wraps a single Claude span inline", () => {
+    const text = "The cat sat on the mat.\n";
+    const html = renderAuthorship(text, [spanAt(text, "cat sat", "claude")]);
+    expect(html).toContain('<span class="cw-by-claude">cat sat</span>');
+  });
+
+  it("marks two authors in one paragraph at exact boundaries", () => {
+    const text = "Alpha beta gamma.\n";
+    const html = renderAuthorship(text, [
+      spanAt(text, "Alpha", "human"),
+      spanAt(text, "gamma", "claude"),
+    ]);
+    expect(html).toContain('<span class="cw-by-human">Alpha</span>');
+    expect(html).toContain('<span class="cw-by-claude">gamma</span>');
+  });
+
+  it("handles two ADJACENT spans (one's end == next's start) in order", () => {
+    const text = "ONETWO\n";
+    const html = renderAuthorship(text, [
+      { start: 0, end: 3, author: "human" }, // ONE
+      { start: 3, end: 6, author: "claude" }, // TWO
+    ]);
+    expect(html).toContain('<span class="cw-by-human">ONE</span><span class="cw-by-claude">TWO</span>');
+  });
+
+  it("clips a span to its block (does not bleed across blocks)", () => {
+    const text = "Para one.\n\nPara two.\n";
+    const html = renderAuthorship(text, [{ start: 0, end: text.length, author: "claude" }]);
+    expect(html).toContain('<span class="cw-by-claude">Para one.</span>');
+    expect(html).toContain('<span class="cw-by-claude">Para two.</span>');
+  });
+
+  it("a code fence overlapping a span gets a block badge, NOT inner sentinels (atomic)", () => {
+    const text = "```js\nconst x = 1;\n```\n";
+    const html = renderAuthorship(text, [{ start: 0, end: text.length, author: "claude" }]);
+    expect(html).toContain("cw-by-claude");
+    expect(html).toContain("cw-badge");
+    expect(html).not.toMatch(/[\uE000-\uE003]/); // no sentinel leaked
+    expect(html).toContain("const x = 1;");
+  });
+
+  it("a mermaid fence authored by Claude renders as a diagram with a badge", () => {
+    const text = "```mermaid\ngraph TD; A-->B;\n```\n";
+    const html = renderAuthorship(text, [{ start: 0, end: text.length, author: "claude" }]);
+    expect(html).toContain('pre class="mermaid"');
+    expect(html).toContain("cw-by-claude");
+    expect(html).toContain("cw-badge");
+  });
+
+  it("never leaks a raw sentinel into prose output", () => {
+    const text = "Some mixed text here.\n";
+    const html = renderAuthorship(text, [spanAt(text, "mixed", "claude")]);
+    expect(html).not.toMatch(/[\uE000-\uE003]/);
+  });
+
+  it("is deterministic", () => {
+    const text = "Stable input paragraph.\n";
+    const spans: AuthorSpan[] = [spanAt(text, "input", "claude")];
+    expect(renderAuthorship(text, spans)).toBe(renderAuthorship(text, spans));
+  });
+});