refactor: remove emojis and apply code formatting

- Remove all emoji characters from output strings for better compatibility
- Update all tests to match non-emoji output
- Apply black formatting to all Python files
- Ensure all tests pass and linting succeeds
- Remove htmlcov directory (already in .gitignore)

This change improves cross-platform compatibility and ensures
consistent code formatting across the project.

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

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

tests/conftest.py

@@ -18,11 +18,11 @@ if "GEMINI_API_KEY" not in os.environ:
 # Configure asyncio for Windows compatibility
 if sys.platform == "win32":
     import asyncio
+
     asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
 
+
 # Pytest configuration
 def pytest_configure(config):
     """Configure pytest with custom markers"""
-    config.addinivalue_line(
-        "markers", "asyncio: mark test as async"
-    )
+    config.addinivalue_line("markers", "asyncio: mark test as async")