diff --git a/backend/src/lib/auth.ts b/backend/src/lib/auth.ts
index 516849a..c6b5acd 100644
--- a/backend/src/lib/auth.ts
+++ b/backend/src/lib/auth.ts
@@ -15,3 +15,17 @@ const { extractAuth, requireRole } = createAuthMiddleware({
 });
 
 export { extractAuth, requireRole };
+
+/**
+ * Convenience: require the caller to have at least 'editor' or 'admin' role.
+ * Use on write routes (POST/PATCH/DELETE) that need role enforcement.
+ */
+export async function requireWriter(req: unknown) {
+  const payload = await extractAuth(req);
+  const role = (payload as { role?: string }).role;
+  if (role !== 'editor' && role !== 'admin' && role !== 'owner') {
+    const { ForbiddenError } = await import('@bytelyst/errors');
+    throw new ForbiddenError('Write access requires editor, admin, or owner role');
+  }
+  return payload;
+}
diff --git a/backend/src/modules/note-agent-actions/routes.integration.test.ts b/backend/src/modules/note-agent-actions/routes.integration.test.ts
index c7b7525..258426c 100644
--- a/backend/src/modules/note-agent-actions/routes.integration.test.ts
+++ b/backend/src/modules/note-agent-actions/routes.integration.test.ts
@@ -2,10 +2,10 @@ import { afterAll, beforeAll, beforeEach, describe, expect, it, vi } from 'vites
 import type { FastifyInstance } from 'fastify';
 
 const { extractAuthMock } = vi.hoisted(() => ({
-  extractAuthMock: vi.fn(async () => ({ sub: 'user_1', type: 'access' })),
+  extractAuthMock: vi.fn(async () => ({ sub: 'user_1', type: 'access', role: 'editor' })),
 }));
 
-vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock }));
+vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock, requireWriter: extractAuthMock }));
 vi.mock('../../lib/product-config.js', () => ({ PRODUCT_ID: 'notelett' }));
 
 import { buildTestApp, resetMemoryDatastore } from '../../test-helpers.js';
diff --git a/backend/src/modules/note-agent-actions/routes.test.ts b/backend/src/modules/note-agent-actions/routes.test.ts
index fcbd547..ca1dd3e 100644
--- a/backend/src/modules/note-agent-actions/routes.test.ts
+++ b/backend/src/modules/note-agent-actions/routes.test.ts
@@ -5,7 +5,7 @@ const { extractAuthMock } = vi.hoisted(() => ({
   extractAuthMock: vi.fn(async () => ({ sub: 'user_1' })),
 }));
 
-vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock }));
+vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock, requireWriter: extractAuthMock }));
 vi.mock('../../lib/product-config.js', () => ({ PRODUCT_ID: 'notelett' }));
 vi.mock('./repository.js', () => ({
   listNoteAgentActions: vi.fn(async () => ({ items: [], total: 0 })),
diff --git a/backend/src/modules/note-artifacts/repository.ts b/backend/src/modules/note-artifacts/repository.ts
index 6312f5c..43ea787 100644
--- a/backend/src/modules/note-artifacts/repository.ts
+++ b/backend/src/modules/note-artifacts/repository.ts
@@ -40,6 +40,13 @@ export async function createNoteArtifact(doc: NoteArtifactDoc): Promise<NoteArti
   return collection().create(doc);
 }
 
+export async function deleteNoteArtifact(id: string, workspaceId: string): Promise<boolean> {
+  const existing = await collection().findById(id, workspaceId);
+  if (!existing) return false;
+  await collection().delete(id, workspaceId);
+  return true;
+}
+
 export async function updateNoteArtifact(
   id: string,
   workspaceId: string,
diff --git a/backend/src/modules/note-artifacts/routes.integration.test.ts b/backend/src/modules/note-artifacts/routes.integration.test.ts
index 59822af..6613512 100644
--- a/backend/src/modules/note-artifacts/routes.integration.test.ts
+++ b/backend/src/modules/note-artifacts/routes.integration.test.ts
@@ -2,10 +2,10 @@ import { afterAll, beforeAll, beforeEach, describe, expect, it, vi } from 'vites
 import type { FastifyInstance } from 'fastify';
 
 const { extractAuthMock } = vi.hoisted(() => ({
-  extractAuthMock: vi.fn(async () => ({ sub: 'user_1', type: 'access' })),
+  extractAuthMock: vi.fn(async () => ({ sub: 'user_1', type: 'access', role: 'editor' })),
 }));
 
-vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock }));
+vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock, requireWriter: extractAuthMock }));
 vi.mock('../../lib/product-config.js', () => ({ PRODUCT_ID: 'notelett' }));
 
 import { buildTestApp, resetMemoryDatastore } from '../../test-helpers.js';
diff --git a/backend/src/modules/note-artifacts/routes.test.ts b/backend/src/modules/note-artifacts/routes.test.ts
index 8482561..5c7e6c0 100644
--- a/backend/src/modules/note-artifacts/routes.test.ts
+++ b/backend/src/modules/note-artifacts/routes.test.ts
@@ -5,7 +5,7 @@ const { extractAuthMock } = vi.hoisted(() => ({
   extractAuthMock: vi.fn(async () => ({ sub: 'user_1' })),
 }));
 
-vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock }));
+vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock, requireWriter: extractAuthMock }));
 vi.mock('../../lib/product-config.js', () => ({ PRODUCT_ID: 'notelett' }));
 vi.mock('./repository.js', () => ({
   listNoteArtifacts: vi.fn(async () => ({ items: [], total: 0 })),
diff --git a/backend/src/modules/note-artifacts/routes.ts b/backend/src/modules/note-artifacts/routes.ts
index d78f025..48ebf2f 100644
--- a/backend/src/modules/note-artifacts/routes.ts
+++ b/backend/src/modules/note-artifacts/routes.ts
@@ -1,6 +1,6 @@
 import type { FastifyInstance, FastifyReply, FastifyRequest } from 'fastify';
 import { BadRequestError, NotFoundError } from '@bytelyst/errors';
-import { extractAuth } from '../../lib/auth.js';
+import { extractAuth, requireWriter } from '../../lib/auth.js';
 import { PRODUCT_ID } from '../../lib/product-config.js';
 import * as repo from './repository.js';
 import {
@@ -23,7 +23,7 @@ export async function noteArtifactRoutes(app: FastifyInstance) {
   });
 
   app.post('/note-artifacts', async (req: FastifyRequest, reply: FastifyReply) => {
-    const auth = await extractAuth(req);
+    const auth = await requireWriter(req);
     const parsed = CreateNoteArtifactSchema.safeParse(req.body);
     if (!parsed.success) {
       throw new BadRequestError(parsed.error.issues.map((issue: { message: string }) => issue.message).join('; '));
@@ -54,7 +54,7 @@ export async function noteArtifactRoutes(app: FastifyInstance) {
   });
 
   app.patch('/note-artifacts/:id', async (req: FastifyRequest) => {
-    const auth = await extractAuth(req);
+    const auth = await requireWriter(req);
     const { id } = req.params as { id: string };
     const workspaceId = (req.query as { workspaceId?: string }).workspaceId;
 
@@ -84,4 +84,26 @@ export async function noteArtifactRoutes(app: FastifyInstance) {
 
     return updated;
   });
+
+  app.delete('/note-artifacts/:id', async (req: FastifyRequest, reply: FastifyReply) => {
+    const auth = await requireWriter(req);
+    const { id } = req.params as { id: string };
+    const workspaceId = (req.query as { workspaceId?: string }).workspaceId;
+
+    if (!workspaceId) {
+      throw new BadRequestError('workspaceId is required');
+    }
+
+    const existing = await repo.getNoteArtifact(id, workspaceId);
+    if (!existing || existing.userId !== auth.sub || existing.productId !== PRODUCT_ID) {
+      throw new NotFoundError('Note artifact not found');
+    }
+
+    const deleted = await repo.deleteNoteArtifact(id, workspaceId);
+    if (!deleted) {
+      throw new NotFoundError('Note artifact not found');
+    }
+
+    reply.code(204).send();
+  });
 }
diff --git a/backend/src/modules/note-relationships/repository.ts b/backend/src/modules/note-relationships/repository.ts
index 8d02be8..e4e552c 100644
--- a/backend/src/modules/note-relationships/repository.ts
+++ b/backend/src/modules/note-relationships/repository.ts
@@ -35,3 +35,14 @@ export async function listRelationships(
 export async function createRelationship(doc: NoteRelationshipDoc): Promise<NoteRelationshipDoc> {
   return collection().create(doc);
 }
+
+export async function deleteRelationship(id: string, workspaceId: string): Promise<boolean> {
+  const existing = await collection().findById(id, workspaceId);
+  if (!existing) return false;
+  await collection().delete(id, workspaceId);
+  return true;
+}
+
+export async function getRelationship(id: string, workspaceId: string): Promise<NoteRelationshipDoc | null> {
+  return collection().findById(id, workspaceId);
+}
diff --git a/backend/src/modules/note-relationships/routes.integration.test.ts b/backend/src/modules/note-relationships/routes.integration.test.ts
index f650a1e..51cb861 100644
--- a/backend/src/modules/note-relationships/routes.integration.test.ts
+++ b/backend/src/modules/note-relationships/routes.integration.test.ts
@@ -2,10 +2,10 @@ import { afterAll, beforeAll, beforeEach, describe, expect, it, vi } from 'vites
 import type { FastifyInstance } from 'fastify';
 
 const { extractAuthMock } = vi.hoisted(() => ({
-  extractAuthMock: vi.fn(async () => ({ sub: 'user_1', type: 'access' })),
+  extractAuthMock: vi.fn(async () => ({ sub: 'user_1', type: 'access', role: 'editor' })),
 }));
 
-vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock }));
+vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock, requireWriter: extractAuthMock }));
 vi.mock('../../lib/product-config.js', () => ({ PRODUCT_ID: 'notelett' }));
 
 import { buildTestApp, resetMemoryDatastore } from '../../test-helpers.js';
diff --git a/backend/src/modules/note-relationships/routes.test.ts b/backend/src/modules/note-relationships/routes.test.ts
index 21cdb57..ad62ac9 100644
--- a/backend/src/modules/note-relationships/routes.test.ts
+++ b/backend/src/modules/note-relationships/routes.test.ts
@@ -5,7 +5,7 @@ const { extractAuthMock } = vi.hoisted(() => ({
   extractAuthMock: vi.fn(async () => ({ sub: 'user_1' })),
 }));
 
-vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock }));
+vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock, requireWriter: extractAuthMock }));
 vi.mock('../../lib/product-config.js', () => ({ PRODUCT_ID: 'notelett' }));
 vi.mock('./repository.js', () => ({
   listRelationships: vi.fn(async () => ({ items: [], total: 0 })),
diff --git a/backend/src/modules/note-relationships/routes.ts b/backend/src/modules/note-relationships/routes.ts
index 0024a08..c5e7196 100644
--- a/backend/src/modules/note-relationships/routes.ts
+++ b/backend/src/modules/note-relationships/routes.ts
@@ -1,6 +1,6 @@
 import type { FastifyInstance } from 'fastify';
-import { BadRequestError } from '@bytelyst/errors';
-import { extractAuth } from '../../lib/auth.js';
+import { BadRequestError, NotFoundError } from '@bytelyst/errors';
+import { extractAuth, requireWriter } from '../../lib/auth.js';
 import { PRODUCT_ID } from '../../lib/product-config.js';
 import * as repo from './repository.js';
 import {
@@ -22,7 +22,7 @@ export async function noteRelationshipRoutes(app: FastifyInstance) {
   });
 
   app.post('/note-relationships', async (req, reply) => {
-    const auth = await extractAuth(req);
+    const auth = await requireWriter(req);
     const parsed = CreateNoteRelationshipSchema.safeParse(req.body);
     if (!parsed.success) {
       throw new BadRequestError(parsed.error.issues.map(issue => issue.message).join('; '));
@@ -47,4 +47,26 @@ export async function noteRelationshipRoutes(app: FastifyInstance) {
     reply.code(201);
     return created;
   });
+
+  app.delete('/note-relationships/:id', async (req, reply) => {
+    const auth = await requireWriter(req);
+    const { id } = req.params as { id: string };
+    const workspaceId = (req.query as { workspaceId?: string }).workspaceId;
+
+    if (!workspaceId) {
+      throw new BadRequestError('workspaceId is required');
+    }
+
+    const existing = await repo.getRelationship(id, workspaceId);
+    if (!existing || existing.userId !== auth.sub || existing.productId !== PRODUCT_ID) {
+      throw new NotFoundError('Relationship not found');
+    }
+
+    const deleted = await repo.deleteRelationship(id, workspaceId);
+    if (!deleted) {
+      throw new NotFoundError('Relationship not found');
+    }
+
+    reply.code(204).send();
+  });
 }
diff --git a/backend/src/modules/note-tasks/repository.ts b/backend/src/modules/note-tasks/repository.ts
index 7d1bea0..afb71de 100644
--- a/backend/src/modules/note-tasks/repository.ts
+++ b/backend/src/modules/note-tasks/repository.ts
@@ -40,6 +40,13 @@ export async function createNoteTask(doc: NoteTaskDoc): Promise<NoteTaskDoc> {
   return collection().create(doc);
 }
 
+export async function deleteNoteTask(id: string, workspaceId: string): Promise<boolean> {
+  const existing = await collection().findById(id, workspaceId);
+  if (!existing) return false;
+  await collection().delete(id, workspaceId);
+  return true;
+}
+
 export async function updateNoteTask(
   id: string,
   workspaceId: string,
diff --git a/backend/src/modules/note-tasks/routes.integration.test.ts b/backend/src/modules/note-tasks/routes.integration.test.ts
index 9123b29..dc8f6b0 100644
--- a/backend/src/modules/note-tasks/routes.integration.test.ts
+++ b/backend/src/modules/note-tasks/routes.integration.test.ts
@@ -2,10 +2,10 @@ import { afterAll, beforeAll, beforeEach, describe, expect, it, vi } from 'vites
 import type { FastifyInstance } from 'fastify';
 
 const { extractAuthMock } = vi.hoisted(() => ({
-  extractAuthMock: vi.fn(async () => ({ sub: 'user_1', type: 'access' })),
+  extractAuthMock: vi.fn(async () => ({ sub: 'user_1', type: 'access', role: 'editor' })),
 }));
 
-vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock }));
+vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock, requireWriter: extractAuthMock }));
 vi.mock('../../lib/product-config.js', () => ({ PRODUCT_ID: 'notelett' }));
 
 import { buildTestApp, resetMemoryDatastore } from '../../test-helpers.js';
diff --git a/backend/src/modules/note-tasks/routes.test.ts b/backend/src/modules/note-tasks/routes.test.ts
index 6f8ab9c..bd7251d 100644
--- a/backend/src/modules/note-tasks/routes.test.ts
+++ b/backend/src/modules/note-tasks/routes.test.ts
@@ -5,7 +5,7 @@ const { extractAuthMock } = vi.hoisted(() => ({
   extractAuthMock: vi.fn(async () => ({ sub: 'user_1' })),
 }));
 
-vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock }));
+vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock, requireWriter: extractAuthMock }));
 vi.mock('../../lib/product-config.js', () => ({ PRODUCT_ID: 'notelett' }));
 vi.mock('./repository.js', () => ({
   listNoteTasks: vi.fn(async () => ({ items: [], total: 0 })),
diff --git a/backend/src/modules/note-tasks/routes.ts b/backend/src/modules/note-tasks/routes.ts
index b7e1e57..e50f9d0 100644
--- a/backend/src/modules/note-tasks/routes.ts
+++ b/backend/src/modules/note-tasks/routes.ts
@@ -1,6 +1,6 @@
 import type { FastifyApp } from '@bytelyst/fastify-core';
 import { BadRequestError, NotFoundError } from '@bytelyst/errors';
-import { extractAuth } from '../../lib/auth.js';
+import { extractAuth, requireWriter } from '../../lib/auth.js';
 import { PRODUCT_ID } from '../../lib/product-config.js';
 import * as repo from './repository.js';
 import {
@@ -25,7 +25,7 @@ export async function noteTaskRoutes(app: RouteApp) {
   });
 
   app.post('/note-tasks', async (req, reply) => {
-    const auth = await extractAuth(req);
+    const auth = await requireWriter(req);
     const parsed = CreateNoteTaskSchema.safeParse(req.body);
     if (!parsed.success) {
       throw new BadRequestError(parsed.error.issues.map((issue: { message: string }) => issue.message).join('; '));
@@ -55,7 +55,7 @@ export async function noteTaskRoutes(app: RouteApp) {
   });
 
   app.patch('/note-tasks/:id', async req => {
-    const auth = await extractAuth(req);
+    const auth = await requireWriter(req);
     const { id } = req.params as { id: string };
     const workspaceId = (req.query as { workspaceId?: string }).workspaceId;
 
@@ -85,4 +85,26 @@ export async function noteTaskRoutes(app: RouteApp) {
 
     return updated;
   });
+
+  app.delete('/note-tasks/:id', async (req, reply) => {
+    const auth = await requireWriter(req);
+    const { id } = req.params as { id: string };
+    const workspaceId = (req.query as { workspaceId?: string }).workspaceId;
+
+    if (!workspaceId) {
+      throw new BadRequestError('workspaceId is required');
+    }
+
+    const existing = await repo.getNoteTask(id, workspaceId);
+    if (!existing || existing.userId !== auth.sub || existing.productId !== PRODUCT_ID) {
+      throw new NotFoundError('Note task not found');
+    }
+
+    const deleted = await repo.deleteNoteTask(id, workspaceId);
+    if (!deleted) {
+      throw new NotFoundError('Note task not found');
+    }
+
+    reply.code(204).send();
+  });
 }
diff --git a/backend/src/modules/notes/repository.ts b/backend/src/modules/notes/repository.ts
index 5ef4739..e2d14a3 100644
--- a/backend/src/modules/notes/repository.ts
+++ b/backend/src/modules/notes/repository.ts
@@ -81,6 +81,21 @@ export async function createNote(doc: NoteDoc): Promise<NoteDoc> {
   return decryptFields(created);
 }
 
+export async function deleteNote(id: string, workspaceId: string): Promise<boolean> {
+  const existing = await collection().findById(id, workspaceId);
+  if (!existing) return false;
+
+  const merged = await encryptFields({
+    ...existing,
+    status: 'archived' as const,
+    deletedAt: new Date().toISOString(),
+    updatedAt: new Date().toISOString(),
+  } as NoteDoc);
+
+  await collection().upsert(merged);
+  return true;
+}
+
 export async function updateNote(
   id: string,
   workspaceId: string,
diff --git a/backend/src/modules/notes/routes.integration.test.ts b/backend/src/modules/notes/routes.integration.test.ts
index 7ad74df..19779bb 100644
--- a/backend/src/modules/notes/routes.integration.test.ts
+++ b/backend/src/modules/notes/routes.integration.test.ts
@@ -2,14 +2,16 @@ import { afterAll, beforeAll, beforeEach, describe, expect, it, vi } from 'vites
 import type { FastifyInstance } from 'fastify';
 
 const { extractAuthMock } = vi.hoisted(() => ({
-  extractAuthMock: vi.fn(async () => ({ sub: 'user_1', type: 'access' })),
+  extractAuthMock: vi.fn(async () => ({ sub: 'user_1', type: 'access', role: 'editor' })),
 }));
 
-vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock }));
+vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock, requireWriter: extractAuthMock }));
 vi.mock('../../lib/product-config.js', () => ({ PRODUCT_ID: 'notelett' }));
 vi.mock('../../lib/extraction-client.js', () => ({
   extractFromText: vi.fn(async () => ({ summary: 'A concise summary.' })),
 }));
+vi.mock('../../lib/telemetry.js', () => ({ trackEvent: vi.fn() }));
+vi.mock('../../lib/feature-flags.js', () => ({ isFeatureEnabled: vi.fn(() => true) }));
 
 import { buildTestApp, resetMemoryDatastore } from '../../test-helpers.js';
 import { noteRoutes } from './routes.js';
diff --git a/backend/src/modules/notes/routes.test.ts b/backend/src/modules/notes/routes.test.ts
index 46fe00f..dab4826 100644
--- a/backend/src/modules/notes/routes.test.ts
+++ b/backend/src/modules/notes/routes.test.ts
@@ -15,7 +15,7 @@ const {
   updateNoteMock: vi.fn(async () => null),
 }));
 
-vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock }));
+vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock, requireWriter: 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) }));
diff --git a/backend/src/modules/notes/routes.ts b/backend/src/modules/notes/routes.ts
index e1e4c4e..055ee55 100644
--- a/backend/src/modules/notes/routes.ts
+++ b/backend/src/modules/notes/routes.ts
@@ -1,7 +1,9 @@
 import type { FastifyApp } from '@bytelyst/fastify-core';
 import { BadRequestError, NotFoundError } from '@bytelyst/errors';
-import { extractAuth } from '../../lib/auth.js';
+import { extractAuth, requireWriter } from '../../lib/auth.js';
 import { PRODUCT_ID } from '../../lib/product-config.js';
+import { trackEvent } from '../../lib/telemetry.js';
+import { isFeatureEnabled } from '../../lib/feature-flags.js';
 import { extractFromText } from '../../lib/extraction-client.js';
 import * as repo from './repository.js';
 import * as artifactRepo from '../note-artifacts/repository.js';
@@ -11,6 +13,9 @@ type RouteApp = Omit<FastifyApp, 'setReadyState' | 'isReadyState'>;
 
 export async function noteRoutes(app: RouteApp) {
   app.get('/notes/search', async req => {
+    if (!isFeatureEnabled('notes.enabled')) {
+      throw new BadRequestError('Notes feature is currently disabled');
+    }
     const auth = await extractAuth(req);
     const parsed = ListNotesQuerySchema.safeParse(req.query);
     if (!parsed.success) {
@@ -55,7 +60,7 @@ export async function noteRoutes(app: RouteApp) {
   });
 
   app.post('/notes', async (req, reply) => {
-    const auth = await extractAuth(req);
+    const auth = await requireWriter(req);
     const parsed = CreateNoteSchema.safeParse(req.body);
     if (!parsed.success) {
       throw new BadRequestError(
@@ -84,12 +89,13 @@ export async function noteRoutes(app: RouteApp) {
     };
 
     const created = await repo.createNote(doc);
+    trackEvent({ event: 'note.created', userId: auth.sub, properties: { noteId: created.id, workspaceId: created.workspaceId } });
     reply.code(201);
     return created;
   });
 
   app.patch('/notes/:id', async req => {
-    const auth = await extractAuth(req);
+    const auth = await requireWriter(req);
     const { id } = req.params as { id: string };
     const workspaceId = (req.query as { workspaceId?: string }).workspaceId;
 
@@ -119,11 +125,12 @@ export async function noteRoutes(app: RouteApp) {
       throw new NotFoundError('Note not found');
     }
 
+    trackEvent({ event: 'note.updated', userId: auth.sub, properties: { noteId: id, workspaceId } });
     return updated;
   });
 
   app.post('/notes/:id/restore', async req => {
-    const auth = await extractAuth(req);
+    const auth = await requireWriter(req);
     const { id } = req.params as { id: string };
     const workspaceId = (req.body as { workspaceId?: string } | undefined)?.workspaceId;
 
@@ -150,7 +157,7 @@ export async function noteRoutes(app: RouteApp) {
   });
 
   app.post('/notes/:id/archive', async req => {
-    const auth = await extractAuth(req);
+    const auth = await requireWriter(req);
     const { id } = req.params as { id: string };
     const workspaceId = (req.body as { workspaceId?: string } | undefined)?.workspaceId;
 
@@ -173,11 +180,12 @@ export async function noteRoutes(app: RouteApp) {
       throw new NotFoundError('Note not found');
     }
 
+    trackEvent({ event: 'note.archived', userId: auth.sub, properties: { noteId: id, workspaceId } });
     return updated;
   });
 
   app.post('/notes/:id/summarize', async (req, reply) => {
-    const auth = await extractAuth(req);
+    const auth = await requireWriter(req);
     const { id } = req.params as { id: string };
     const workspaceId = (req.body as { workspaceId?: string } | undefined)?.workspaceId;
 
@@ -243,4 +251,22 @@ export async function noteRoutes(app: RouteApp) {
     reply.header('Content-Disposition', 'attachment; filename="notes-export.json"');
     return { exportedAt: new Date().toISOString(), notes: result.items };
   });
+
+  app.delete('/notes/:id', async (req, reply) => {
+    const auth = await requireWriter(req);
+    const { id } = req.params as { id: string };
+    const workspaceId = (req.query as { workspaceId?: string }).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');
+    }
+
+    await repo.deleteNote(id, workspaceId);
+    reply.code(204).send();
+  });
 }
diff --git a/backend/src/modules/saved-views/routes.integration.test.ts b/backend/src/modules/saved-views/routes.integration.test.ts
index 7180b46..6e00df4 100644
--- a/backend/src/modules/saved-views/routes.integration.test.ts
+++ b/backend/src/modules/saved-views/routes.integration.test.ts
@@ -2,10 +2,10 @@ import { afterAll, beforeAll, beforeEach, describe, expect, it, vi } from 'vites
 import type { FastifyInstance } from 'fastify';
 
 const { extractAuthMock } = vi.hoisted(() => ({
-  extractAuthMock: vi.fn(async () => ({ sub: 'user_1', type: 'access' })),
+  extractAuthMock: vi.fn(async () => ({ sub: 'user_1', type: 'access', role: 'editor' })),
 }));
 
-vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock }));
+vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock, requireWriter: extractAuthMock }));
 vi.mock('../../lib/product-config.js', () => ({ PRODUCT_ID: 'notelett' }));
 
 import { buildTestApp, resetMemoryDatastore } from '../../test-helpers.js';
diff --git a/backend/src/modules/saved-views/routes.test.ts b/backend/src/modules/saved-views/routes.test.ts
index 0aac91a..74ebce5 100644
--- a/backend/src/modules/saved-views/routes.test.ts
+++ b/backend/src/modules/saved-views/routes.test.ts
@@ -5,7 +5,7 @@ const { extractAuthMock } = vi.hoisted(() => ({
   extractAuthMock: vi.fn(async () => ({ sub: 'user_1' })),
 }));
 
-vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock }));
+vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock, requireWriter: extractAuthMock }));
 vi.mock('../../lib/product-config.js', () => ({ PRODUCT_ID: 'notelett' }));
 vi.mock('./repository.js', () => ({
   listSavedViews: vi.fn(async () => ({ items: [], total: 0 })),
diff --git a/backend/src/modules/workspaces/repository.ts b/backend/src/modules/workspaces/repository.ts
index 48e76ce..ab95164 100644
--- a/backend/src/modules/workspaces/repository.ts
+++ b/backend/src/modules/workspaces/repository.ts
@@ -30,6 +30,13 @@ export async function createWorkspace(doc: WorkspaceDoc): Promise<WorkspaceDoc>
   return collection().create(doc);
 }
 
+export async function deleteWorkspace(id: string, userId: string): Promise<boolean> {
+  const existing = await collection().findById(id, userId);
+  if (!existing) return false;
+  await collection().delete(id, userId);
+  return true;
+}
+
 export async function updateWorkspace(
   id: string,
   userId: string,
diff --git a/backend/src/modules/workspaces/routes.integration.test.ts b/backend/src/modules/workspaces/routes.integration.test.ts
index f2fe7bb..b3c8e58 100644
--- a/backend/src/modules/workspaces/routes.integration.test.ts
+++ b/backend/src/modules/workspaces/routes.integration.test.ts
@@ -2,11 +2,12 @@ import { afterAll, beforeAll, beforeEach, describe, expect, it, vi } from 'vites
 import type { FastifyInstance } from 'fastify';
 
 const { extractAuthMock } = vi.hoisted(() => ({
-  extractAuthMock: vi.fn(async () => ({ sub: 'user_1', type: 'access' })),
+  extractAuthMock: vi.fn(async () => ({ sub: 'user_1', type: 'access', role: 'editor' })),
 }));
 
-vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock }));
+vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock, requireWriter: extractAuthMock }));
 vi.mock('../../lib/product-config.js', () => ({ PRODUCT_ID: 'notelett' }));
+vi.mock('../../lib/telemetry.js', () => ({ trackEvent: vi.fn() }));
 
 import { buildTestApp, resetMemoryDatastore } from '../../test-helpers.js';
 import { workspaceRoutes } from './routes.js';
diff --git a/backend/src/modules/workspaces/routes.test.ts b/backend/src/modules/workspaces/routes.test.ts
index c777266..154b69e 100644
--- a/backend/src/modules/workspaces/routes.test.ts
+++ b/backend/src/modules/workspaces/routes.test.ts
@@ -5,7 +5,7 @@ const { extractAuthMock } = vi.hoisted(() => ({
   extractAuthMock: vi.fn(async () => ({ sub: 'user_1' })),
 }));
 
-vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock }));
+vi.mock('../../lib/auth.js', () => ({ extractAuth: extractAuthMock, requireWriter: extractAuthMock }));
 vi.mock('../../lib/product-config.js', () => ({ PRODUCT_ID: 'notelett' }));
 vi.mock('./repository.js', () => ({
   listWorkspaces: vi.fn(async () => ({ items: [], total: 0 })),
diff --git a/backend/src/modules/workspaces/routes.ts b/backend/src/modules/workspaces/routes.ts
index caf9dc2..0fd5219 100644
--- a/backend/src/modules/workspaces/routes.ts
+++ b/backend/src/modules/workspaces/routes.ts
@@ -1,7 +1,8 @@
 import type { FastifyInstance } from 'fastify';
 import { BadRequestError, NotFoundError } from '@bytelyst/errors';
-import { extractAuth } from '../../lib/auth.js';
+import { extractAuth, requireWriter } from '../../lib/auth.js';
 import { PRODUCT_ID } from '../../lib/product-config.js';
+import { trackEvent } from '../../lib/telemetry.js';
 import * as repo from './repository.js';
 import { countNotesByWorkspaces } from '../notes/repository.js';
 import {
@@ -51,7 +52,7 @@ export async function workspaceRoutes(app: FastifyInstance) {
   });
 
   app.post('/workspaces', async (req, reply) => {
-    const auth = await extractAuth(req);
+    const auth = await requireWriter(req);
     const parsed = CreateWorkspaceSchema.safeParse(req.body);
     if (!parsed.success) {
       throw new BadRequestError(parsed.error.issues.map(issue => issue.message).join('; '));
@@ -72,12 +73,13 @@ export async function workspaceRoutes(app: FastifyInstance) {
     };
 
     const created = await repo.createWorkspace(doc);
+    trackEvent({ event: 'workspace.created', userId: auth.sub, properties: { workspaceId: created.id } });
     reply.code(201);
     return created;
   });
 
   app.patch('/workspaces/:id', async req => {
-    const auth = await extractAuth(req);
+    const auth = await requireWriter(req);
     const { id } = req.params as { id: string };
     const parsed = UpdateWorkspaceSchema.safeParse(req.body);
     if (!parsed.success) {
@@ -101,4 +103,21 @@ export async function workspaceRoutes(app: FastifyInstance) {
 
     return updated;
   });
+
+  app.delete('/workspaces/:id', async (req, reply) => {
+    const auth = await requireWriter(req);
+    const { id } = req.params as { id: string };
+
+    const existing = await repo.getWorkspace(id, auth.sub);
+    if (!existing || existing.productId !== PRODUCT_ID) {
+      throw new NotFoundError('Workspace not found');
+    }
+
+    const deleted = await repo.deleteWorkspace(id, auth.sub);
+    if (!deleted) {
+      throw new NotFoundError('Workspace not found');
+    }
+
+    reply.code(204).send();
+  });
 }
diff --git a/docs/AGENT_TASK_ROADMAP.md b/docs/AGENT_TASK_ROADMAP.md
index f0664b6..088cb63 100644
--- a/docs/AGENT_TASK_ROADMAP.md
+++ b/docs/AGENT_TASK_ROADMAP.md
@@ -66,31 +66,31 @@ cd ../learning_ai_notes/backend && pnpm install && pnpm run typecheck
 
 These block the web app from being usable by real users.
 
-- [ ] **1.1** Add auth pages — login, register, forgot-password
+- [x] **1.1** Add auth pages — login, register, forgot-password — [`839218a`](https://github.com/saravanakumardb1/learning_ai_notes/commit/839218a)
   - Create `web/src/app/(auth)/login/page.tsx`, `register/page.tsx`, `forgot-password/page.tsx`
   - Wire to existing `@bytelyst/react-auth` config in `web/src/lib/auth.ts`
   - Include form validation, error states, loading states
   - Files: new pages under `web/src/app/(auth)/`
 
-- [ ] **1.2** Add `middleware.ts` for route protection
+- [x] **1.2** Add `middleware.ts` for route protection — [`839218a`](https://github.com/saravanakumardb1/learning_ai_notes/commit/839218a)
   - Redirect unauthenticated users from `(app)/*` routes to `/login`
   - Redirect authenticated users from `/login` to `/dashboard`
   - Check kill-switch status (call `checkKillSwitch()` from `web/src/lib/kill-switch.ts`)
   - File: `web/src/middleware.ts`
 
-- [ ] **1.3** Replace plain textarea with a rich note editor
+- [x] **1.3** Replace plain textarea with a rich note editor — [`839218a`](https://github.com/saravanakumardb1/learning_ai_notes/commit/839218a)
   - Current `NoteEditor.tsx` is a bare `<textarea>` — inadequate for a notes product
   - Add markdown support (headings, bold, italic, lists, code blocks) at minimum
   - Consider Tiptap, Lexical, or MDXEditor
   - File: `web/src/components/NoteEditor.tsx`
 
-- [ ] **1.4** Add workspace CRUD from web
+- [x] **1.4** Add workspace CRUD from web — [`839218a`](https://github.com/saravanakumardb1/learning_ai_notes/commit/839218a)
   - Backend already has `POST /workspaces` and `PATCH /workspaces/:id`
   - Add create-workspace modal/form on the workspaces page
   - Add edit/delete actions on workspace cards
   - Files: `web/src/app/(app)/workspaces/page.tsx`, new modal component
 
-- [ ] **1.5** Wire toast notifications
+- [x] **1.5** Wire toast notifications — [`839218a`](https://github.com/saravanakumardb1/learning_ai_notes/commit/839218a)
   - `ToastProvider` from `@bytelyst/ui` is mounted but zero toasts are triggered
   - Replace `window.confirm()` calls with a confirmation dialog component
   - Add success/error toasts after note create, update, archive, link, task create, artifact create