Add Google Contacts integration and fix critical Windows issues

- Add People API integration with contact management tools (create, list, get)
- Fix OAuth flow: replace deprecated OOB with localhost callback
- Fix Ctrl+C handling with proper signal handlers for graceful shutdown
- Fix UTF-8 encoding in scheduled_tasks.py for Windows compatibility
- Add users/ directory to gitignore to protect personal data

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

bot_runner.py

@@ -14,6 +14,8 @@ Environment variables:
 
 import argparse
 import asyncio
+import signal
+import sys
 import traceback
 from dotenv import load_dotenv
 
@@ -45,6 +47,7 @@ class BotRunner:
         self.runtime: AdapterRuntime = None
         self.agent: Agent = None
         self.scheduler: TaskScheduler = None
+        self.shutdown_event = asyncio.Event()
 
     def _load_adapter(self, platform: str) -> bool:
         """Load and register a single adapter. Returns True if loaded."""
@@ -127,6 +130,17 @@ class BotRunner:
         if not self.setup():
             return
 
+        # Set up signal handlers
+        loop = asyncio.get_running_loop()
+
+        def signal_handler(signum, frame):
+            print(f"\n\n[Shutdown] Received signal {signum}...")
+            loop.call_soon_threadsafe(self.shutdown_event.set)
+
+        # Register signal handlers (works on both Windows and Unix)
+        signal.signal(signal.SIGINT, signal_handler)
+        signal.signal(signal.SIGTERM, signal_handler)
+
         print("\n" + "=" * 60)
         print("Starting bot...")
         print("=" * 60 + "\n")
@@ -143,11 +157,9 @@ class BotRunner:
             print("Bot is running! Press Ctrl+C to stop.")
             print("=" * 60 + "\n")
 
-            while True:
-                await asyncio.sleep(1)
+            # Wait for shutdown signal
+            await self.shutdown_event.wait()
 
-        except KeyboardInterrupt:
-            print("\n\n[Shutdown] Received interrupt signal...")
         except Exception as e:
             print(f"\n[Error] {e}")
             traceback.print_exc()