Fix linting violations for v1.0.0 release preparation

- Apply black formatting to all Python files
- Fix various flake8 violations in agent system code
- Clean up imports and whitespace issues

🤖 Generated with [Claude Code](https://claude.ai/code)

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

tests/test_registry.py

@@ -158,7 +158,10 @@ This agent uses both base-agent and dependent-agent.
 
     # Test complex dependency resolution
     resolved = registry.resolve_dependencies(["complex-agent"])
-    assert all(agent in resolved for agent in ["base-agent", "dependent-agent", "complex-agent"])
+    assert all(
+        agent in resolved
+        for agent in ["base-agent", "dependent-agent", "complex-agent"]
+    )
 
 
 def test_agent_registry_get_templates(tmp_path):