Record agent security paper round deployment

[estelledc]

Summary

• Record completion of PR Add four agent security and robustness papers #38 and GitHub Pages workflow 29385090535.
• Capture the gap summary for the agent safety / robustness paper round.
• Preserve evidence boundaries: all four new notes remain STATIC_ANALYSIS / UNVERIFIED.

Verification

• npm run audit:doc-lifecycle
• npm run audit:operations
• git diff --check