Speed up malware analyzer filtering

[cgfixit]

Follow-up optimization after the recent analyzer loop work.

This branch keeps the jobs/session path unchanged and narrows the performance change to the malware analyzer by:

• keeping the vectorized status mask
• avoiding the slower earlier full-row follow-up path
• preserving missing-column behavior and output shape

Validation:

• python -m py_compile vhc_simplifier.py
• python -m pytest tests/ -q
• ruff check vhc_simplifier.py tests/
• ruff format --check vhc_simplifier.py tests/

Observed probe result on large synthetic malware input:

• malware analyzer improved from roughly 160 ms to 90 ms in local timing checks

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

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