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Root Cause Analysis: - PEP 668 'externally-managed-environment' blocking pip - 27 Python validation scripts unable to find modules - Manual venv management complex and fragile Solution: Official GitHub Actions setup-python v4 - Provides Python 3.12 in standard PATH - Handles virtual environments automatically - pip works without conflicts - Caching built-in Changes: ✓ core job: Added setup-python@v4 after checkout - Removes manual venv creation (source /c/Users/kjh20/venv/bin/activate) - Python 3.12 available immediately - pip install works directly ✓ workflow-lint job: Simplified - Added setup-python@v4 - Removed venv wrapper, direct python3 works ✓ Setup Python Environment: Simplified - No venv activation needed - Direct pip install - 27 validation scripts just work™ Expected Results: ✓ ModuleNotFoundError: yaml, pytest, requests → FIXED ✓ PEP 668 constraint error → FIXED ✓ All Python validation scripts → WORKING ✓ CI build time → SLIGHTLY FASTER Fallback in case of issues: - If setup-python fails, system Python works (Ubuntu has python3.12+) - venv still available as backup Phase 0 Week 1: CI Environment Hardening (Attempt 7) Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>