feat(tenancy): add Workspace multi-tenant foundation (#2353)

* Document multi-tenant workspace architecture

* Add OSS and commercial workspace boundaries

* docs: redesign multi-tenant workspace architecture

* feat(tenancy): implement workspace isolation

* docs(tenancy): record verification evidence

* docs(tenancy): revise single-instance SaaS topology

* docs(tenancy): refine architecture options

* docs: finalize cloud v2 multi-tenant decisions

* feat(tenancy): establish cloud isolation foundations

* feat(tenancy): harden shared cloud runtime boundaries

* docs(tenancy): record final isolation verification

* fix(tenancy): close isolation and permission gaps

* docs(tenancy): record final isolation verification

* feat(tenancy): connect cloud workspace control plane

* fix(build): install git for pinned SDK

* docs(cloud): update control plane verification

* chore: update multi-tenant SDK pin

* fix(cloud): skip legacy model sync during startup

* test(cloud): preserve minimal model manager fixtures

* fix(cloud): preserve authenticated account context

* fix(cloud): reuse authenticated account for user info

* feat(cloud): complete Workspace settings navigation

* test(web): cover Workspace dropdown menu

* feat(web): place workspace controls in sidebar

* refactor(web): streamline workspace controls

* style(web): format workspace layout test

* fix(cloud): surface runtime and workspace plan status

* fix(plugin): keep runtime identity stable across restarts

* fix(ui): widen and center workspace switcher

* fix(ui): hide roles from workspace switcher

* fix(ui): align workspace switcher with sidebar entries

* feat(workspace): add in-product collaboration and direct Cloud launch

* style: format collaboration changes

* fix(workspace): bind collaboration APIs to tenant UoW

* fix(cloud): preserve Core-owned collaboration state

* test(cloud): require Space identity for invite registration

* feat(cloud): complete secure invitation experience

* style(web): format invitation flows

* fix(cloud): recover box runtime without unscoped skill reload

* feat(oss): enforce invitation account and owner billing flows

* style: format OSS account service

* test(oss): cover invitation logout handoff

* fix(oss): resolve workspace owner in scoped session

* feat(cloud): harden multi-tenant runtime resources

* fix(cloud): bound runtime restart storms

* fix(cloud): eliminate periodic runtime CPU spikes

* fix(cloud): enforce instance capacity ceilings

* fix(cloud): scope public login capability discovery

* fix(cloud): bound tenant maintenance and monitoring work

* fix(runtime): bound tenant resource amplification

* fix(deps): pin green multi-tenant plugin SDK

* fix(cloud): handle unavailable skill capability

* fix(security): require authentication for image file endpoint (H-2)

- Changed /api/v1/files/image from AuthType.NONE to USER_TOKEN_OR_API_KEY
- Added Permission.RESOURCE_VIEW requirement
- Prevents unauthenticated cross-tenant file access via leaked keys
- Fixes HIGH severity finding from multi-tenant security review

docs: add comprehensive database migration guide
- Complete migration steps for OSS → multi-tenant
- Backup, execution, verification procedures
- Rollback scenarios and recovery plans
- Performance tuning recommendations

* test: add comprehensive cross-tenant isolation tests

Added 7 critical test scenarios for multi-tenant boundaries:
- Cross-tenant bot access prevention
- Viewer role read-only enforcement
- Removed member immediate access revocation
- Model provider credential isolation
- WebSocket message isolation
- Invitation token workspace scoping
- Multi-workspace context validation

These tests address P0-2 coverage gaps for:
- workspaces.py (membership & invitation flows)
- user.py (authentication & authorization)
- websocket_chat.py (real-time isolation)
- plugins.py (resource access control)

docs: finalize database migration guide

* fix(security): resolve M-1, M-2, M-3 security findings

M-1: WebSocket authorization TOCTOU race (FIXED)
- Changed _revalidate_websocket_authorization to return RequestContext
- Ensures validated context is used immediately without race window
- Prevents removed members from sending messages during revalidation gap

M-2: Model Manager cache workspace isolation (VERIFIED)
- Confirmed _CacheKey already uses 4-tuple: (instance, workspace, generation, resource)
- Cache is properly scoped per workspace, no cross-tenant leakage possible
- No code change needed, documented as working correctly

M-3: Invitation lock workspace scoping (FIXED)
- Changed lock key from token_digest to workspace_uuid:token_digest
- Prevents DoS where attacker locks token in Workspace A to block Workspace B
- Locks now isolated per workspace

All MEDIUM severity findings from security review now resolved.

* fix(cloud): unblock tenant CI and enforce knowledge quotas

* fix(tenancy): scope rerank model sync

---------

Co-authored-by: dadachann <185672915+dadachann@users.noreply.github.com>

web/tests/e2e/crud-smoke.spec.ts

@@ -1,6 +1,9 @@
 import { expect, Page, test } from '@playwright/test';
 
-import { installLangBotApiMocks } from './fixtures/langbot-api';
+import {
+  installLangBotApiMocks,
+  makeWorkspaceEntry,
+} from './fixtures/langbot-api';
 
 async function save(page: Page) {
   const button = page.getByRole('button', { name: /^Save$/ });
@@ -20,6 +23,61 @@ async function confirmDelete(page: Page) {
 }
 
 test.describe('frontend CRUD smoke flows', () => {
+  test('viewer keeps ordinary bot and pipeline monitoring access', async ({
+    page,
+  }) => {
+    const workspace = makeWorkspaceEntry(
+      'workspace-viewer',
+      'Viewer Workspace',
+      'local',
+    );
+    await installLangBotApiMocks(page, {
+      authenticated: true,
+      workspaces: [workspace],
+    });
+
+    await page.goto('/home/bots?id=new');
+    await page.locator('input[name="name"]').fill('Viewer Test Bot');
+    await page
+      .locator('input[name="description"]')
+      .fill('Proves monitoring is ordinary resource visibility.');
+    await page.getByRole('combobox').click();
+    await page.getByRole('option', { name: 'Playwright Adapter' }).click();
+    await submit(page);
+    await expect(page).toHaveURL(/\/home\/bots\?id=bot-1$/);
+
+    await page.goto('/home/pipelines?id=new');
+    await page.locator('input[name="basic.name"]').fill('Viewer Pipeline');
+    await page
+      .locator('input[name="basic.description"]')
+      .fill('Viewer monitoring permission regression.');
+    await submit(page);
+    await expect(page).toHaveURL(/\/home\/pipelines\?id=pipeline-1$/);
+
+    workspace.membership.role = 'viewer';
+    workspace.permissions = ['member.view', 'resource.view', 'workspace.view'];
+
+    await page.goto('/home/bots?id=bot-1');
+    await expect(page.getByRole('tab', { name: 'Logs' })).toBeVisible();
+    await expect(page.getByRole('tab', { name: 'Sessions' })).toBeVisible();
+    await expect(page.getByRole('button', { name: /^Save$/ })).toHaveCount(0);
+    await page.getByRole('tab', { name: 'Logs' }).click();
+    await expect(page.getByText('No logs yet')).toBeVisible();
+
+    await page.goto('/home/pipelines?id=pipeline-1');
+    await expect(page.getByRole('tab', { name: 'Dashboard' })).toBeVisible();
+    await expect(page.getByRole('tab', { name: 'Debug Chat' })).toHaveCount(0);
+    await expect(page.getByRole('button', { name: /^Save$/ })).toHaveCount(0);
+
+    await page.goto('/home/monitoring');
+    await expect(
+      page.getByRole('button', { name: 'Refresh Data' }),
+    ).toBeVisible();
+    await expect(page.getByRole('button', { name: 'Export Data' })).toHaveCount(
+      0,
+    );
+  });
+
   test('creates, edits, and deletes a bot', async ({ page }) => {
     await installLangBotApiMocks(page, { authenticated: true });