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>

src/langbot/pkg/telemetry/heartbeat.py

@@ -27,9 +27,25 @@ if typing.TYPE_CHECKING:
 HEARTBEAT_INTERVAL_SECONDS = 24 * 3600
 
 
-async def _count(ap: core_app.Application, table) -> int:
+async def _count(
+    ap: core_app.Application,
+    table,
+    *,
+    cloud_counter: typing.Callable[[], int] | None = None,
+) -> int:
     """Count rows in a persistence table; -1 when unavailable."""
     try:
+        persistence_mgr = ap.persistence_mgr
+        cloud_runtime = getattr(getattr(persistence_mgr, 'mode', None), 'value', None) == 'cloud_runtime'
+        if cloud_runtime:
+            # The Cloud runtime role deliberately cannot bypass RLS. Counting
+            # every tenant by opening one UoW per Workspace turns a best-effort
+            # daily heartbeat into thousands of serial SQL statements. The
+            # already-loaded runtime registries are authoritative for this
+            # process and provide an O(1), connection-free operational count.
+            if cloud_counter is None:
+                return -1
+            return max(int(cloud_counter()), 0)
         result = await ap.persistence_mgr.execute_async(sqlalchemy.select(sqlalchemy.func.count()).select_from(table))
         return int(result.scalar() or 0)
     except Exception:
@@ -81,11 +97,27 @@ async def build_heartbeat_payload(ap: core_app.Application) -> dict:
         pass
 
     # Resource counts
-    features['pipeline_count'] = await _count(ap, persistence_pipeline.LegacyPipeline)
-    features['mcp_server_count'] = await _count(ap, persistence_mcp.MCPServer)
-    features['knowledge_base_count'] = await _count(ap, persistence_rag.KnowledgeBase)
+    features['pipeline_count'] = await _count(
+        ap,
+        persistence_pipeline.LegacyPipeline,
+        cloud_counter=lambda: len(ap.pipeline_mgr._pipelines_by_key),
+    )
+    features['mcp_server_count'] = await _count(
+        ap,
+        persistence_mcp.MCPServer,
+        cloud_counter=lambda: len(ap.tool_mgr.mcp_tool_loader._sessions),
+    )
+    features['knowledge_base_count'] = await _count(
+        ap,
+        persistence_rag.KnowledgeBase,
+        cloud_counter=lambda: len(ap.rag_mgr.knowledge_bases),
+    )
     if 'bot_count' not in features:
-        features['bot_count'] = await _count(ap, persistence_bot.Bot)
+        features['bot_count'] = await _count(
+            ap,
+            persistence_bot.Bot,
+            cloud_counter=lambda: len(ap.platform_mgr._bots_by_key),
+        )
 
     # Plugin count (from plugin runtime)
     try:
@@ -99,8 +131,8 @@ async def build_heartbeat_payload(ap: core_app.Application) -> dict:
     # Skill count (from Box runtime via skill manager)
     try:
         skill_mgr = getattr(ap, 'skill_mgr', None)
-        if skill_mgr is not None and getattr(skill_mgr, 'skills', None) is not None:
-            features['skill_count'] = len(skill_mgr.skills)
+        if skill_mgr is not None:
+            features['skill_count'] = skill_mgr.total_cached_skill_count()
     except Exception:
         pass