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/api/run_history_routes.py

@@ -0,0 +1,64 @@
+"""
+REST API routes for council run history.
+
+Endpoints:
+    GET  /api/runs/           — List recent council runs
+    GET  /api/runs/{run_id}   — Get a specific run's details
+"""
+
+from typing import List, Optional
+
+from fastapi import APIRouter, Depends, HTTPException, Query
+from pydantic import BaseModel
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from database import get_session
+from services.run_service import get_run, list_runs
+
+
+run_history_router = APIRouter()
+
+
+# ---------------------------------------------------------------------------
+# Response Models
+# ---------------------------------------------------------------------------
+
+class RunHistoryResponse(BaseModel):
+    id: str
+    blueprint_id: Optional[str] = None
+    input_topic: str
+    status: str
+    execution_mode: str
+    final_draft: Optional[str] = None
+    critic_score: Optional[float] = None
+    iteration_count: Optional[int] = None
+    error: Optional[str] = None
+    created_at: Optional[str] = None
+    completed_at: Optional[str] = None
+
+
+# ---------------------------------------------------------------------------
+# Endpoints
+# ---------------------------------------------------------------------------
+
+@run_history_router.get("/runs/", response_model=List[RunHistoryResponse])
+async def list_all_runs(
+    limit: int = Query(default=50, ge=1, le=200),
+    offset: int = Query(default=0, ge=0),
+    session: AsyncSession = Depends(get_session),
+):
+    """List recent council runs, ordered by most recent first."""
+    runs = await list_runs(session, limit=limit, offset=offset)
+    return [r.to_dict() for r in runs]
+
+
+@run_history_router.get("/runs/{run_id}", response_model=RunHistoryResponse)
+async def get_single_run(
+    run_id: str,
+    session: AsyncSession = Depends(get_session),
+):
+    """Retrieve a specific council run by ID."""
+    run = await get_run(session, run_id)
+    if run is None:
+        raise HTTPException(status_code=404, detail=f"Run '{run_id}' not found.")
+    return run.to_dict()