phase 16 implementation

docs/phase15/ABUSE_CONTROL_REPORT_v1.0.md

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+# Phase 15 Abuse-control Report
+
+**Date:** 2026-06-25  
+**Status:** Partial static controls; production gate blocked
+
+## Summary
+
+The API enforces a 16 KiB body limit, request marker, origin check, strict schema, content type, and honeypot. No distributed rate limit or approved CAPTCHA/accessibility alternative exists.
+
+## Executed evidence
+
+- Static API controls pass.
+- Exact content type defect fixed.
+
+## Unexecuted or blocked evidence
+
+- Rapid requests, oversized/malformed payloads, origins, scripted submissions, slow assistive-technology users, international formats, threshold behavior.
+- Distributed rate limiting and operational monitoring.
+
+## Release disposition
+
+Production submission remains blocked.