fix: add is_sheltered attribute to AgentSnapshot class

- Add is_sheltered parameter to AgentSnapshot in both locations
- Include is_sheltered in agent_data dictionary for idle chat

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

backend/app/llm.py

@@ -211,6 +211,7 @@ class LLMService:
                 f"You are {agent.name}. "
                 f"Personality: {agent.personality}. "
                 f"Current Status: HP={agent.hp}, Energy={agent.energy}. "
+                f"Shelter Status: {'Under shelter (safe from weather)' if agent.is_sheltered else 'Exposed (vulnerable to weather)'}. "
                 f"You live on a survival island. "
                 f"Relevant Memories:\n{memory_context}\n"
                 f"React to the following event briefly (under 20 words). "
@@ -276,6 +277,7 @@ class LLMService:
                 f"You are {agent.name}. "
                 f"Personality: {agent.personality}. "
                 f"Current Status: HP={agent.hp}, Energy={agent.energy}. "
+                f"Shelter Status: {'Under shelter (protected)' if agent.is_sheltered else 'Exposed to elements'}. "
                 f"You are stranded on a survival island. "
                 f"It is currently {time_of_day} and the weather is {weather}. "
                 f"Say something brief (under 15 words) about your situation or thoughts. "