Implement Phase 4: tools, God Mode, and missing features

Backend:
- Add Tavily web search tool wrapper (tools/web_search.py)
- Add PDF reader + ChromaDB vector store tool (tools/pdf_reader.py)
- Bind tools to LLM calls via .bind_tools() in dynamic_graph_builder
- Implement God Mode using LangGraph interrupt_before + MemorySaver
- Add approve/reject/modify API endpoints for God Mode
- Add PDF upload endpoint with ingestion pipeline
- Add persistent run history (CouncilRun model + run_service + API)
- Add Alembic migration for council_runs table
- Enhance WebSocket to emit run_paused and run_resumed events
- Add tests for tools, God Mode, and run history

Frontend:
- Add God Mode approval UI (GodModePanel component)
- Add Auto-Pilot / God Mode toggle in Konferenzzimmer
- Add functional PDF upload handler
- Add Conditional Edge editor (EdgeSettingsPanel component)
- Add edge click selection in ArchitectCanvas
- Update Zustand store with edge selection and update actions
- Update types for God Mode, execution modes, and WS events
- Update API client with God Mode, PDF upload, and blueprint run endpoints
- Update WebSocket hook for paused/resumed events
- Add Vitest config and frontend tests (store, parser, types, API)

https://claude.ai/code/session_017U6idFgaqnYTXzPxA7mxMv

backend/tools/__init__.py

@@ -1,7 +1,12 @@
-"""
-Agent tools for CouncilOS.
+"""Agent tools for CouncilOS."""
 
-Phase 4 will add:
-- web_search_tool: Tavily Search API wrapper
-- pdf_reader_tool: PyPDF + ChromaDB vector store wrapper
-"""
+from .web_search import web_search, create_web_search_tool
+from .pdf_reader import pdf_search, ingest_pdf, create_pdf_search_tool
+
+__all__ = [
+    "web_search",
+    "create_web_search_tool",
+    "pdf_search",
+    "ingest_pdf",
+    "create_pdf_search_tool",
+]