Integrate SimbaKit PetKit service into Docker stack and LangChain agent

Adds simbakit/ as a subfolder service that polls PetKit smart devices
(litter box, fountain, feeder) and exposes pet weight, litter activity,
and device health data via three new LangChain tools.

Also fixes stale alerts bug where cleared conditions (e.g. waste bin
full) persisted because the query used max alert time instead of the
device's last_seen_at timestamp.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

blueprints/conversation/agents.py

@@ -12,6 +12,7 @@ from tavily import AsyncTavilyClient
 from blueprints.conversation.memory import save_memory
 from blueprints.rag.logic import query_vector_store
 from utils.obsidian_service import ObsidianService
+from utils.simbakit_service import SimbaKitService
 from utils.ynab_service import YNABService
 
 # Load environment variables
@@ -43,6 +44,14 @@ except (ValueError, Exception) as e:
     print(f"YNAB service not initialized: {e}")
     ynab_enabled = False
 
+# Initialize SimbaKit service (will only work if SIMBAKIT_URL is set)
+try:
+    simbakit_service = SimbaKitService()
+    simbakit_enabled = True
+except (ValueError, Exception) as e:
+    print(f"SimbaKit service not initialized: {e}")
+    simbakit_enabled = False
+
 # Initialize Obsidian service (will only work if OBSIDIAN_VAULT_PATH is set)
 try:
     obsidian_service = ObsidianService()
@@ -689,8 +698,97 @@ async def get_calendar_events(
     return stdout.decode()
 
 
+@tool
+async def simbakit_device_status() -> str:
+    """Get the status of all PetKit smart devices and any active alerts.
+
+    Use this tool when the user asks about:
+    - PetKit device statuses or health
+    - Whether any pet devices have issues or alerts
+    - Litter box, water fountain, or feeder device status
+    - Any device errors or warnings
+
+    Returns:
+        Device statuses and active alerts from all PetKit devices.
+    """
+    if not simbakit_enabled:
+        return "SimbaKit integration is not configured. Please set SIMBAKIT_URL environment variable."
+
+    try:
+        devices = await simbakit_service.get_devices()
+        alerts = await simbakit_service.get_alerts()
+        return f"{devices}\n\n{alerts}"
+    except Exception as e:
+        return f"Error fetching device status: {str(e)}"
+
+
+@tool
+async def simbakit_weight_history(pet_name: str = "", days: int = 30) -> str:
+    """Get pet weight history and trends from PetKit smart litter box.
+
+    Use this tool when the user asks about:
+    - How much Simba weighs or pet weight
+    - Weight trends or changes over time
+    - Recent weight measurements
+
+    Args:
+        pet_name: Name of the pet to filter by (optional, defaults to all pets)
+        days: Number of days of history to retrieve (default 30)
+
+    Returns:
+        Weight records, averages, and trends.
+    """
+    if not simbakit_enabled:
+        return "SimbaKit integration is not configured. Please set SIMBAKIT_URL environment variable."
+
+    try:
+        return await simbakit_service.get_pet_weights(
+            pet_name=pet_name or None,
+            days=days,
+        )
+    except Exception as e:
+        return f"Error fetching weight history: {str(e)}"
+
+
+@tool
+async def simbakit_litter_activity(pet_name: str = "", days: int = 7) -> str:
+    """Get litter box activity (bathroom visits) from PetKit smart litter box.
+
+    Use this tool when the user asks about:
+    - Simba's litter box usage or bathroom habits
+    - How often the cat poops or pees
+    - Litter box visit statistics
+    - Recent litter box events
+
+    Args:
+        pet_name: Name of the pet to filter by (optional, defaults to all pets)
+        days: Number of days of history to retrieve (default 7)
+
+    Returns:
+        Litter box visit statistics and recent events.
+    """
+    if not simbakit_enabled:
+        return "SimbaKit integration is not configured. Please set SIMBAKIT_URL environment variable."
+
+    try:
+        return await simbakit_service.get_litter_events(
+            pet_name=pet_name or None,
+            days=days,
+        )
+    except Exception as e:
+        return f"Error fetching litter activity: {str(e)}"
+
+
 # Create tools list based on what's available
 tools = [get_current_date, simba_search, web_search, save_user_memory]
+if simbakit_enabled:
+    tools.extend(
+        [
+            simbakit_device_status,
+            simbakit_weight_history,
+            simbakit_litter_activity,
+        ]
+    )
 if ynab_enabled:
     tools.extend(
         [