alembic/versions/002_graph_contextual_references.py docs/CONVERSATIONS_BACKEND_PLAN.md docs/CONVERSATIONS_COMPLETE_ARCHITECTURE.md docs/CONVERSATIONS_ROADMAP.md docs/EPIC_2_CODE_REVIEW_REPORT.md docs/IMPLEMENTATION_CHECKLIST.md docs/SPRINT_PLANNING.md docs/architecture/knowledge-base-README.md docs/architecture/knowledge-base-api.md docs/architecture/knowledge-base-implementation.py docs/architecture/knowledge-base-migrations.sql docs/architecture/knowledge-base-performance.md docs/architecture/knowledge-base-system.md docs/architecture/team_participation_system.md docs/graph-context-examples.md docs/graph-context-implementation-summary.md docs/graph-context-quickstart.md docs/graph-contextual-referencing-architecture.md migrations/010_conversation_participants.sql migrations/011_conversations_enhancement.sql migrations/012_activity_feed.sql migrations/012_participants_and_invitations.sql src/api/main.py src/api/middleware/__init__.py src/api/middleware/permissions.py src/api/models/__init__.py src/api/models/activity.py src/api/models/conversation.py src/api/models/participant.py src/api/models/search.py src/api/routers/__init__.py src/api/routers/activity_router.py src/api/routers/conversation_router.py src/api/routers/graph_context_router.py src/api/routers/invitation_router.py src/api/routers/message_router.py src/api/routers/participant_router.py src/api/routers/search_router.py src/api/routers/websocket_router.py src/api/services/activity_service.py src/api/services/conversation_service.py src/api/services/graph_context_service.py src/api/services/message_service.py src/api/services/participant_service.py src/api/services/search_service.py tests/api/middleware/test_permissions.py tests/api/routers/__init__.py tests/api/routers/test_activity_router.py tests/api/routers/test_conversation_router.py tests/api/routers/test_invitation_router.py tests/api/routers/test_message_router.py tests/api/routers/test_participant_router.py tests/api/routers/test_search_router.py tests/api/routers/test_websocket_router.py tests/api/services/test_conversation_service.py tests/api/services/test_message_service.py tests/api/services/test_participant_service.py tests/api/services/test_search_service.py tests/integration/test_multi_user_collaboration.py tests/test_activity_service.py