cleanup and error handling

python/llm-server/error.py

python/llm-server/model.py

python/llm-server/queries.py

python/llm-server/templates/agent_action.txt

python/llm-server/templates/chat_extract_plan.txt

python/llm-server/templates/chat_summary_agent_old.txt

python/llm-server/templates/chat_summary_single.txt

python/llm-server/templates/chat_summary_unrelated.txt

python/llm-server/templates/chat_summary_user_info.txt

python/llm-server/templates/chat_system.txt

python/llm-server/templates/chat_validate_statement.txt

python/llm-server/templates/convo_summary_v2.txt

python/llm-server/templates/convo_summary_v3.txt

python/llm-server/templates/plan_day.txt

python/llm-server/templates/plan_day_decomp.txt

python/llm-server/templates/poignancy.txt

python/llm-server/templates/reflection_a.txt

python/llm-server/templates/reflection_q.txt

python/llm-server/templates/relationship.txt