fix(pdf): render the pdf dispatch card (live browser-smoke gap)

The browser e2e check on the live dispatch session found the tool-pdf
part rendered NO card: the artifact renderer registry had no pdf entry
(the doc comment literally says "add your renderer here"), and the typed
TeacherUITools union + the chat.tsx job-part enumerations (poll cadence,
dispatch nudge, settle-sync) all missed the new tool kind.

- PdfJobCard in job-card.tsx: the research JobCard idiom, kind pdf —
  registered in artifacts/index.ts.
- ui-message.ts: pdf entry in TeacherUITools (fire-and-forget ack output).
- chat.tsx: two mechanical "tool-pdf" additions to the research/demo/visual
  enumerations — UI-stream file, flagged for review at merge (same
  treatment as the activity-dock type-forced entries).
- demos.test.tsx: live/settled dispatch-card renders + registry pin.

tests/demos.test.tsx

@@ -40,7 +40,7 @@ import {
 import { sanitizeSvg, VisualCard } from "../components/artifacts/visual-card.tsx";
 import { SubagentSteerCard } from "../components/artifacts/steer-card.tsx";
 import { DispatchCard } from "../components/artifacts/dispatch-card.tsx";
-import { JobCard } from "../components/artifacts/job-card.tsx";
+import { JobCard, PdfJobCard } from "../components/artifacts/job-card.tsx";
 import { JobsContext } from "../components/jobs-context.ts";
 import { demoInputSchema, jobTools, pdfInputSchema, visualInputSchema } from "../src/agent/tools/jobs.ts";
 import { runDemoBuilder } from "../src/agent/subagents/demo-builder.ts";
@@ -289,6 +289,48 @@ describe("dispatch card rendering (the tool-call ack box)", () => {
 		);
 		assert.equal(html, "");
 	});
+
+	// sources v0 — the live browser smoke (2026-09-19) caught the pdf dispatch
+	// part rendering nothing: PdfJobCard is the fix.
+	it("pdf dispatch renders the live PDF-reader card while the job runs", () => {
+		const pdfJob: JobRecord = ({
+			id: "jp1",
+			kind: "pdf",
+			chatId: "c",
+			toolCallId: "call-1",
+			status: "running",
+			activity: 'pdf_render: 42-44 @150dpi',
+			createdAt: new Date(Date.now() - 5000).toISOString(),
+			updatedAt: new Date().toISOString(),
+		}) as JobRecord;
+		const html = renderToStaticMarkup(
+			<JobsContext.Provider value={[pdfJob]}>
+				<PdfJobCard part={ackPart as never} />
+			</JobsContext.Provider>,
+		);
+		assert.match(html, /PDF reader/);
+		assert.match(html, /pdf_render/);
+	});
+
+	it("pdf dispatch settles to the delivered one-liner", () => {
+		const pdfJob: JobRecord = ({
+			id: "jp1",
+			kind: "pdf",
+			chatId: "c",
+			toolCallId: "call-1",
+			status: "done",
+			activity: "delivered",
+			createdAt: new Date(Date.now() - 5000).toISOString(),
+			updatedAt: new Date().toISOString(),
+		}) as JobRecord;
+		const html = renderToStaticMarkup(
+			<JobsContext.Provider value={[pdfJob]}>
+				<PdfJobCard part={ackPart as never} />
+			</JobsContext.Provider>,
+		);
+		assert.match(html, /PDF reader/);
+		assert.match(html, /delivered/);
+	});
 });
 
 describe("steer card rendering (the delivered artifact)", () => {
@@ -802,5 +844,7 @@ describe("tool + renderer registry wiring", () => {
 	it("the artifact renderer registry maps demo/visual to the W6 cards", () => {
 		assert.equal(artifactRenderers.demo, DemoCard);
 		assert.equal(artifactRenderers.visual, VisualCard);
+		// sources v0 — pdf maps to its dispatch card (the live-smoke gap)
+		assert.equal(artifactRenderers.pdf, PdfJobCard);
 	});
 });