docs: mark tor connection pooling complete

TODO.md

@@ -124,46 +124,15 @@ and report() methods. Integrated into main loop with configurable stats_interval
 
 ## Medium Term (Next Quarter)
 
-### [ ] 11. Tor Connection Pooling
+### [x] 11. Tor Connection Pooling
 
-**Problem:** Each proxy test creates a new Tor connection. Tor circuit establishment
-is slow (~2-3 seconds).
-
-**Implementation:**
-```python
-# new file: connection_pool.py
-class TorConnectionPool:
-    """Pool of reusable Tor SOCKS connections."""
-
-    def __init__(self, tor_hosts, pool_size=10):
-        self.tor_hosts = tor_hosts
-        self.pool_size = pool_size
-        self.connections = Queue.Queue(pool_size)
-        self.lock = threading.Lock()
-
-    def get(self, timeout=5):
-        """Get a Tor connection from pool, or create new."""
-        try:
-            return self.connections.get(timeout=0.1)
-        except Queue.Empty:
-            return self._create_connection()
-
-    def release(self, conn):
-        """Return connection to pool."""
-        try:
-            self.connections.put_nowait(conn)
-        except Queue.Full:
-            conn.close()
-
-    def _create_connection(self):
-        """Create new Tor SOCKS connection."""
-        host = random.choice(self.tor_hosts)
-        # ... establish connection
-```
-
-**Files:** new connection_pool.py, proxywatchd.py
-**Effort:** High
-**Risk:** Medium
+**Completed.** Added connection pooling with worker-Tor affinity and health monitoring.
+- connection_pool.py: TorHostState class tracks per-host health, latency, backoff
+- connection_pool.py: TorConnectionPool with worker affinity, warmup, statistics
+- proxywatchd.py: Workers get consistent Tor host assignment for circuit reuse
+- Success/failure tracking with exponential backoff (5s, 10s, 20s, 40s, max 60s)
+- Latency tracking with rolling averages
+- Pool status reported alongside periodic stats
 
 ---