Add rate limiting to /process endpoint

- Uses slowapi for rate limiting
- Default: 10 requests/minute per IP
- Configurable via RATE_LIMIT env var
- Returns HTTP 429 when limit exceeded

main.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 """
-Egregore Brain Service - AI reasoning API
+Egregore Reason Service - AI reasoning API
 
 Provides HTTP API for conversation processing with Claude.
 Runs on port 8081.
@@ -9,9 +9,12 @@ Runs on port 8081.
 import os
 from typing import Optional
 
-from fastapi import FastAPI, HTTPException
+from fastapi import FastAPI, HTTPException, Request
 from pydantic import BaseModel
 from dotenv import load_dotenv
+from slowapi import Limiter, _rate_limit_exceeded_handler
+from slowapi.util import get_remote_address
+from slowapi.errors import RateLimitExceeded
 import anthropic
 
 from tools import TOOLS, execute_tool
@@ -25,7 +28,15 @@ ANTHROPIC_API_KEY = os.getenv("ANTHROPIC_API_KEY")
 if not ANTHROPIC_API_KEY:
     raise ValueError("ANTHROPIC_API_KEY not set")
 
-app = FastAPI(title="Egregore Brain Service", docs_url="/docs")
+# Rate limiting configuration
+RATE_LIMIT = os.getenv("RATE_LIMIT", "10/minute")
+
+# Initialize rate limiter
+limiter = Limiter(key_func=get_remote_address)
+
+app = FastAPI(title="Egregore Reason Service", docs_url="/docs")
+app.state.limiter = limiter
+app.add_exception_handler(RateLimitExceeded, _rate_limit_exceeded_handler)
 
 # Initialize Anthropic client
 client = anthropic.AsyncAnthropic(api_key=ANTHROPIC_API_KEY)
@@ -45,7 +56,8 @@ class ToolRequest(BaseModel):
 
 # Endpoints
 @app.post("/process")
-async def api_process(req: ProcessRequest):
+@limiter.limit(RATE_LIMIT)
+async def api_process(request: Request, req: ProcessRequest):
     """Process a conversation with tool use loop"""
     try:
         response_blocks = await process_conversation(
@@ -82,7 +94,7 @@ async def api_get_prompt():
 @app.get("/health")
 async def health():
     """Health check endpoint"""
-    return {"status": "ok", "service": "brain"}
+    return {"status": "ok", "service": "reason"}
 
 
 if __name__ == "__main__":