Unit tests (no API required):
- test_imports: All agent modules importable
- test_todo_manager_basic: TodoManager CRUD
- test_todo_manager_constraints: Max items, one in_progress
- test_reminder_constants: INITIAL_REMINDER, NAG_REMINDER
- test_nag_reminder_in_agent_loop: NAG injection in correct place
- test_env_config: MODEL_ID, ANTHROPIC_BASE_URL from env
- test_default_model: Default model fallback
- test_tool_schemas: v1 tool definitions valid
CI now runs unit-test and integration-test as separate jobs.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
