phase 16 implementation

docs/phase15/SECURITY_VALIDATION_REPORT_v1.0.md

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+# Phase 15 Security Validation Report
+
+**Date:** 2026-06-25  
+**Status:** Static controls passed; dynamic and dependency checks blocked
+
+## Summary
+
+Static review confirms request marker, same-origin check, exact JSON content type, body limit, strict schema, honeypot, bounded timeout, idempotency, normalized errors, no-store responses, CSP, and server-only environment controls. The prefix media-type defect was fixed.
+
+## Executed evidence
+
+- Phase 14 security validator passes through C15-004.
+- Secret-pattern and runtime URL audit passes.
+- Exact content-type behavior assertions pass.
+
+## Unexecuted or blocked evidence
+
+- Registry vulnerability/license audit.
+- Dynamic CSRF, origin, replay, malformed input, CSP, headers, rate limit, webhook, and vendor credential testing on final build.
+
+## Release disposition
+
+Security is not production-approved. Rate limiting, durable idempotency, vendors, and dynamic evidence remain blockers.