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>

tests/unit_tests/test_preproc.py

@@ -16,10 +16,21 @@ from langbot_plugin.api.entities.builtin.provider.message import Message
 from langbot_plugin.api.entities.builtin.provider.prompt import Prompt
 from langbot_plugin.api.entities.builtin.provider.session import Conversation, LauncherTypes, Session
 
+from langbot.pkg.api.http.context import ExecutionContext
+
+
+_CONTEXT = ExecutionContext(
+    instance_uuid='instance-a',
+    workspace_uuid='workspace-a',
+    placement_generation=1,
+    bot_uuid='bot-1',
+    pipeline_uuid='pipe-1',
+)
+
 
 def _make_query() -> Query:
     message_chain = MessageChain([Plain(text='create a skill')])
-    return Query(
+    query = Query(
         query_id=1,
         launcher_type=LauncherTypes.PERSON,
         launcher_id='launcher-1',
@@ -45,6 +56,8 @@ def _make_query() -> Query:
         },
         variables={},
     )
+    object.__setattr__(query, '_execution_context', _CONTEXT)
+    return query
 
 
 def _make_conversation() -> Conversation:
@@ -84,6 +97,8 @@ def _make_app(*, skill_service) -> SimpleNamespace:
             get_pipeline=AsyncMock(return_value={'extensions_preferences': {'enable_all_skills': True}})
         ),
         skill_mgr=SimpleNamespace(
+            ensure_loaded=AsyncMock(),
+            get_skills=Mock(return_value={}),
             build_skill_aware_prompt_addition=Mock(return_value=''),
             skills={},
         ),
@@ -119,6 +134,7 @@ async def test_preproc_enables_skill_authoring_tools_when_skill_service_availabl
 
     assert result.result_type == entities_module.ResultType.CONTINUE
     app.tool_mgr.get_all_tools.assert_awaited_once_with(
+        _CONTEXT,
         None,
         None,
         include_skill_authoring=True,
@@ -137,6 +153,7 @@ async def test_preproc_disables_skill_authoring_tools_when_skill_service_missing
 
     assert result.result_type == entities_module.ResultType.CONTINUE
     app.tool_mgr.get_all_tools.assert_awaited_once_with(
+        _CONTEXT,
         None,
         None,
         include_skill_authoring=False,
@@ -157,6 +174,7 @@ async def test_preproc_disables_mcp_resource_tools_when_agent_reading_is_disable
 
     assert result.result_type == entities_module.ResultType.CONTINUE
     app.tool_mgr.get_all_tools.assert_awaited_once_with(
+        _CONTEXT,
         None,
         None,
         include_skill_authoring=True,
@@ -179,7 +197,10 @@ async def test_preproc_injects_skill_index_into_system_prompt():
     result = await stage_process_capture(preproc_module, app, query)
 
     assert result.result_type == entities_module.ResultType.CONTINUE
-    app.skill_mgr.build_skill_aware_prompt_addition.assert_called_once_with(bound_skills=None)
+    app.skill_mgr.build_skill_aware_prompt_addition.assert_called_once_with(
+        _CONTEXT,
+        bound_skills=None,
+    )
     head = query.prompt.messages[0]
     assert head.role == 'system'
     assert head.content.endswith(addendum)
@@ -206,7 +227,10 @@ async def test_preproc_respects_pipeline_bound_skills_subset():
     result = await stage_process_capture(preproc_module, app, query)
 
     assert result.result_type == entities_module.ResultType.CONTINUE
-    app.skill_mgr.build_skill_aware_prompt_addition.assert_called_once_with(bound_skills=['only-this'])
+    app.skill_mgr.build_skill_aware_prompt_addition.assert_called_once_with(
+        _CONTEXT,
+        bound_skills=['only-this'],
+    )
     assert query.variables.get('_pipeline_bound_skills') == ['only-this']