Security Signoff: v1.4.7

Status

Security review for v1.4.7 is complete.

Outcome:

• no critical blockers
• no secret leakage findings
• no production-stopping monitoring flaws
• release posture acceptable

Scope Covered

The completed review covered:

• operator authentication controls
• protected observability surfaces
• production monitoring migration to GCP-native automation
• rate limiting and security event telemetry
• receipt persistence and runtime security posture exposure

Final Disposition

v1.4.7 is cleared for production use under the current operating model.

Residual items are operational refinements, not release blockers.

Accepted Residuals

The following were explicitly accepted as low-risk or informational:

• protected endpoint discovery without elevated alerting when no credential is presented
• reuse of the production application image for the monitoring job

These do not change the current release decision.

Operational Follow-Ups

Recommended follow-up work:

1. confirm Cloud Logging retention for helix-production-alerts matches audit policy
2. observe operator rate-limit behavior under normal admin automation and tune if needed
3. keep artifact verification promotion aligned with the live deployed digest after each deploy

Control Summary

The following controls were in place and reviewed as part of the release posture:

• enforced admin auth on operator endpoints
• authenticated metrics endpoint
• origin enforcement for Guardian browser traffic
• operator and ingress rate limiting
• GCS-backed dual receipt persistence
• GCP-native production monitoring path
• runtime security transparency metadata

Release Position

v1.4.7 is suitable to move forward without additional security gating, subject to normal post-deploy verification and ongoing monitoring.