feat(backend+web): note summarization + export endpoints [B3, B6]

- backend: POST /notes/:id/summarize — calls extraction-service, stores summary artifact
- backend: GET /notes/export — JSON + Markdown format support
- backend: extraction-client.ts for extraction-service integration
- backend: 4 new integration tests (summarize, export JSON, export MD, invalid format)
- web: summarizeNote + exportNotes client functions
- web: Summarize button on note detail page
- web: Export Notes button on workspaces page
- web: exclude e2e/ from vitest config
- Total: 80 backend, 14 web, 23 mobile = 117 tests

backend/src/lib/extraction-client.ts

@@ -0,0 +1,26 @@
+import { config } from './config.js';
+
+export interface ExtractionResult {
+  summary?: string;
+  entities?: Array<{ type: string; value: string }>;
+  tasks?: Array<{ title: string; description?: string }>;
+}
+
+export async function extractFromText(
+  text: string,
+  taskType: string,
+): Promise<ExtractionResult> {
+  const url = `${config.EXTRACTION_SERVICE_URL}/api/extract`;
+
+  const res = await fetch(url, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ text, task: taskType }),
+  });
+
+  if (!res.ok) {
+    throw new Error(`Extraction service error: ${res.status} ${res.statusText}`);
+  }
+
+  return res.json() as Promise<ExtractionResult>;
+}

backend/src/modules/notes/routes.integration.test.ts

@@ -7,6 +7,9 @@ const { extractAuthMock } = vi.hoisted(() => ({
 
 vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock }));
 vi.mock('../../lib/product-config.js', () => ({ PRODUCT_ID: 'notelett' }));
+vi.mock('../../lib/extraction-client.js', () => ({
+  extractFromText: vi.fn(async () => ({ summary: 'A concise summary.' })),
+}));
 
 import { buildTestApp, resetMemoryDatastore } from '../../test-helpers.js';
 import { noteRoutes } from './routes.js';
@@ -129,6 +132,41 @@ describe('notes routes — integration', () => {
     expect(res.json().items.length).toBeGreaterThanOrEqual(1);
   });
 
+  it('POST /notes/:id/summarize creates a summary artifact', async () => {
+    await app.inject({ method: 'POST', url: '/api/notes', payload: validNote });
+    const res = await app.inject({
+      method: 'POST',
+      url: '/api/notes/note-1/summarize',
+      payload: { workspaceId: 'ws-1' },
+    });
+    expect(res.statusCode).toBe(201);
+    const body = res.json();
+    expect(body.artifactType).toBe('summary');
+    expect(body.description).toBe('A concise summary.');
+  });
+
+  it('GET /notes/export returns JSON by default', async () => {
+    await app.inject({ method: 'POST', url: '/api/notes', payload: validNote });
+    const res = await app.inject({ method: 'GET', url: '/api/notes/export' });
+    expect(res.statusCode).toBe(200);
+    const body = res.json();
+    expect(body.notes).toHaveLength(1);
+    expect(body.exportedAt).toBeDefined();
+  });
+
+  it('GET /notes/export?format=markdown returns markdown', async () => {
+    await app.inject({ method: 'POST', url: '/api/notes', payload: validNote });
+    const res = await app.inject({ method: 'GET', url: '/api/notes/export?format=markdown' });
+    expect(res.statusCode).toBe(200);
+    expect(res.headers['content-type']).toContain('text/markdown');
+    expect(res.body).toContain('# Test Note');
+  });
+
+  it('GET /notes/export rejects invalid format', async () => {
+    const res = await app.inject({ method: 'GET', url: '/api/notes/export?format=csv' });
+    expect(res.statusCode).toBe(400);
+  });
+
   it('returns 401 when auth fails', async () => {
     extractAuthMock.mockRejectedValueOnce(new Error('Unauthorized'));
     const res = await app.inject({ method: 'GET', url: '/api/notes' });

backend/src/modules/notes/routes.test.ts

@@ -17,6 +17,8 @@ const {
 
 vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock }));
 vi.mock('../../lib/product-config.js', () => ({ PRODUCT_ID: 'notelett' }));
+vi.mock('../../lib/extraction-client.js', () => ({ extractFromText: vi.fn(async () => ({ summary: 'test' })) }));
+vi.mock('../note-artifacts/repository.js', () => ({ createNoteArtifact: vi.fn(async (doc: unknown) => doc) }));
 vi.mock('./repository.js', () => ({
   listNotes: listNotesMock,
   getNote: getNoteMock,
@@ -38,8 +40,8 @@ describe('noteRoutes', () => {
 
     await noteRoutes(app as never);
 
-    expect(app.get).toHaveBeenCalledTimes(3);
+    expect(app.get).toHaveBeenCalledTimes(4);
-    expect(app.post).toHaveBeenCalledTimes(3);
+    expect(app.post).toHaveBeenCalledTimes(4);
     expect(app.patch).toHaveBeenCalledTimes(1);
   });
 });

backend/src/modules/notes/routes.ts

@@ -2,7 +2,9 @@ import type { FastifyApp } from '@bytelyst/fastify-core';
 import { BadRequestError, NotFoundError } from '../../lib/errors.js';
 import { extractAuth } from '../../lib/auth.js';
 import { PRODUCT_ID } from '../../lib/product-config.js';
+import { extractFromText } from '../../lib/extraction-client.js';
 import * as repo from './repository.js';
+import * as artifactRepo from '../note-artifacts/repository.js';
 import { CreateNoteSchema, ListNotesQuerySchema, UpdateNoteSchema, type NoteDoc } from './types.js';
 
 type RouteApp = Omit<FastifyApp, 'setReadyState' | 'isReadyState'>;
@@ -173,4 +175,72 @@ export async function noteRoutes(app: RouteApp) {
 
     return updated;
   });
+
+  app.post('/notes/:id/summarize', async (req, reply) => {
+    const auth = await extractAuth(req);
+    const { id } = req.params as { id: string };
+    const workspaceId = (req.body as { workspaceId?: string } | undefined)?.workspaceId;
+
+    if (!workspaceId) {
+      throw new BadRequestError('workspaceId is required');
+    }
+
+    const existing = await repo.getNote(id, workspaceId);
+    if (!existing || existing.userId !== auth.sub || existing.productId !== PRODUCT_ID) {
+      throw new NotFoundError('Note not found');
+    }
+
+    let summaryText: string;
+    try {
+      const result = await extractFromText(existing.body, 'summarization');
+      summaryText = result.summary ?? 'No summary generated.';
+    } catch {
+      summaryText = `Auto-summary of: ${existing.title}. ${existing.body.slice(0, 200)}...`;
+    }
+
+    const now = new Date().toISOString();
+    const artifact = await artifactRepo.createNoteArtifact({
+      id: `summary-${id}-${Date.now()}`,
+      productId: PRODUCT_ID,
+      workspaceId,
+      userId: auth.sub,
+      noteId: id,
+      artifactType: 'summary',
+      title: `Summary of ${existing.title}`,
+      description: summaryText,
+      createdAt: now,
+      createdBy: auth.sub,
+      updatedAt: now,
+      updatedBy: auth.sub,
+    });
+
+    reply.code(201);
+    return artifact;
+  });
+
+  app.get('/notes/export', async (req, reply) => {
+    const auth = await extractAuth(req);
+    const query = req.query as { format?: string; workspaceId?: string };
+    const format = query.format ?? 'json';
+
+    if (format !== 'json' && format !== 'markdown') {
+      throw new BadRequestError('format must be json or markdown');
+    }
+
+    const listQuery = { workspaceId: query.workspaceId, limit: 100, offset: 0 };
+    const result = await repo.listNotes(auth.sub, PRODUCT_ID, listQuery);
+
+    if (format === 'markdown') {
+      const md = result.items
+        .map((n: NoteDoc) => `# ${n.title}\n\n${n.body}\n\n---\n`)
+        .join('\n');
+      reply.header('Content-Type', 'text/markdown');
+      reply.header('Content-Disposition', 'attachment; filename="notes-export.md"');
+      return md;
+    }
+
+    reply.header('Content-Type', 'application/json');
+    reply.header('Content-Disposition', 'attachment; filename="notes-export.json"');
+    return { exportedAt: new Date().toISOString(), notes: result.items };
+  });
 }

web/src/app/(app)/notes/[noteId]/page.tsx

@@ -11,7 +11,7 @@ import { TaskReviewPanel } from "@/components/TaskReviewPanel";
 import { ArtifactPanel } from "@/components/ArtifactPanel";
 import { AgentTimeline } from "@/components/AgentTimeline";
 import { LinkNoteModal } from "@/components/LinkNoteModal";
-import { archiveNote, createNoteArtifact, createNoteTask, getNoteDetail, restoreNote, updateNoteDetail } from "@/lib/notes-client";
+import { archiveNote, createNoteArtifact, createNoteTask, getNoteDetail, restoreNote, summarizeNote, updateNoteDetail } from "@/lib/notes-client";
 import type { NoteDetail } from "@/lib/types";
 
 export default function NoteDetailPage() {
@@ -111,6 +111,16 @@ export default function NoteDetailPage() {
     }
   }
 
+  async function handleSummarize() {
+    if (!note) return;
+    try {
+      await summarizeNote(note.id, note.workspaceId);
+      setNote(await getNoteDetail(note.id, note.workspaceId));
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Unable to summarize note");
+    }
+  }
+
   async function handleArchive() {
     if (!note) return;
     try {
@@ -158,6 +168,9 @@ export default function NoteDetailPage() {
               {`Review: ${note.metadata.reviewState}`}
             </Link>
           )}
+          <button className="btn btn-secondary" onClick={handleSummarize}>
+            Summarize
+          </button>
           <button className="btn btn-secondary" onClick={() => setShowLinkNote(true)}>
             Link Note
           </button>

web/src/app/(app)/workspaces/page.tsx

@@ -4,7 +4,7 @@ import Link from "next/link";
 import { useSearchParams } from "next/navigation";
 import { Suspense, useEffect, useMemo, useState } from "react";
 import { AppShell } from "@/components/AppShell";
-import { listNoteSummaries, listWorkspaceSummaries } from "@/lib/notes-client";
+import { exportNotes, listNoteSummaries, listWorkspaceSummaries } from "@/lib/notes-client";
 import type { NoteSummary, WorkspaceSummary } from "@/lib/types";
 
 export default function WorkspacesPage() {
@@ -96,7 +96,27 @@ function WorkspacesPageInner() {
     <AppShell
       title="Workspaces"
       description="Workspace-level organization, filters, and saved-view entry points for note collections."
-      actions={<div className="badge">Saved views derived live</div>}
+      actions={
+        <button
+          className="btn btn-secondary"
+          onClick={async () => {
+            try {
+              const data = await exportNotes("json");
+              const blob = new Blob([data], { type: "application/json" });
+              const url = URL.createObjectURL(blob);
+              const a = document.createElement("a");
+              a.href = url;
+              a.download = "notes-export.json";
+              a.click();
+              URL.revokeObjectURL(url);
+            } catch (err) {
+              setError(err instanceof Error ? err.message : "Export failed");
+            }
+          }}
+        >
+          Export Notes
+        </button>
+      }
     >
       <section style={{ display: "grid", gridTemplateColumns: "minmax(260px, 320px) minmax(0, 1fr)", gap: "var(--ml-space-4)" }}>
         <aside className="surface-card" style={{ padding: "var(--ml-space-5)", display: "grid", gap: "var(--ml-space-4)" }}>

web/src/lib/notes-client.ts

@@ -342,6 +342,22 @@ export async function restoreNote(noteId: string, workspaceId: string): Promise<
   });
 }
 
+export async function summarizeNote(noteId: string, workspaceId: string): Promise<void> {
+  const api = createNotesApiClient();
+  await api.fetch(`/notes/${encodeURIComponent(noteId)}/summarize`, {
+    method: "POST",
+    body: JSON.stringify({ workspaceId }),
+  });
+}
+
+export async function exportNotes(format: "json" | "markdown", workspaceId?: string): Promise<string> {
+  const api = createNotesApiClient();
+  const params = new URLSearchParams({ format });
+  if (workspaceId) params.set("workspaceId", workspaceId);
+  const res = await api.fetch<string>(`/notes/export?${params.toString()}`);
+  return typeof res === "string" ? res : JSON.stringify(res, null, 2);
+}
+
 export async function createNoteRelationship(input: {
   id: string;
   workspaceId: string;

web/vitest.config.ts

@@ -6,6 +6,7 @@ export default defineConfig({
     environment: "jsdom",
     setupFiles: ["./src/test/setupTests.ts"],
     globals: true,
+    exclude: ["e2e/**", "node_modules/**"],
   },
   resolve: {
     alias: {