Refresh tracked product metrics snapshot

[msaad00]

Summary

• make the product metrics snapshot count tracked repo files instead of local ignored artifacts
• refresh generated product metrics for tests, UI pages, and Python modules
• keep release metrics reproducible from a dirty developer machine without counting Finder-style duplicates

Verification

• python scripts/product_metrics_snapshot.py --write
• python scripts/product_metrics_snapshot.py > /tmp/product_metrics_snapshot.md && cmp -s /tmp/product_metrics_snapshot.md docs/PRODUCT_METRICS.md
• JSON snapshot equality against scripts/product_metrics_snapshot.py::build_snapshot
• uv run ruff check scripts/product_metrics_snapshot.py
• python scripts/check_release_consistency.py
• python scripts/check_duplicate_artifacts.py
• git diff --check