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Add scripts/update_checker.py — dependency health monitor that checks installed Python packages against PyPI latest, classifies updates by semver (major/minor/patch), flags breaking changes, and outputs a human-readable or JSON report. Acceptance criteria: ✓ Compares installed vs latest via pip list + PyPI JSON API ✓ Reports major/minor/patch updates with severity (high/medium/low) ✓ Flags breaking changes (major version jumps) ✓ Output: formatted text report or --json machine report Also adds comprehensive test suite (11 tests, all passing). Refs: #109