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

frontend/app/types/council.ts

@@ -51,7 +51,9 @@ export interface CouncilBlueprint {
 }
 
 // Council run (execution)
-export type RunStatus = "pending" | "running" | "completed" | "failed";
+export type RunStatus = "pending" | "running" | "completed" | "failed" | "paused";
+
+export type ExecutionMode = "auto-pilot" | "god-mode";
 
 export interface CouncilRun {
   run_id: string;
@@ -61,13 +63,43 @@ export interface CouncilRun {
   error?: string;
 }
 
+// God Mode state from the backend
+export interface GodModeState {
+  run_id: string;
+  paused: boolean;
+  next_nodes: string[];
+  current_state: {
+    current_draft?: string;
+    critic_score?: number;
+    iteration_count?: number;
+    feedback_history?: string[];
+  };
+}
+
+export type GodModeAction = "approve" | "reject" | "modify";
+
 // WebSocket messages from backend
-export type WSMessageType = "node_enter" | "node_exit" | "run_complete" | "run_error";
+export type WSEventType =
+  | "connected"
+  | "node_active"
+  | "run_paused"
+  | "run_resumed"
+  | "run_complete"
+  | "run_failed";
 
 export interface WSMessage {
-  type: WSMessageType;
-  node_id?: string;
-  node_name?: string;
-  result?: string;
+  event: WSEventType;
+  run_id: string;
+  // node_active
+  node?: string;
+  iteration?: number;
+  // run_paused
+  next_nodes?: string[];
+  current_draft?: string;
+  critic_score?: number;
+  iteration_count?: number;
+  // run_complete
+  final_draft?: string;
+  // run_failed
   error?: string;
 }