docs(devlog): record zero-leak proxy benchmark evidence

The matrix is now populated from commit-pinned sources on both sides:
OpenCodex scores sixteen of sixteen categories PASS after the gap-closure
commit, while the surveyed TypeScript proxies — Portkey Gateway, Claude
Code Router, and mcp-proxy at their 2026 heads — carry FAIL or UNKNOWN
cells in body admission, stream bounds, concurrency caps, and secret
handling. Claude Code Router stands closest, with a genuinely strong
continuation archive and diagnostic budgets. The superiority sentence is
deliberately omitted: the cohort still has UNKNOWN cells, and the rule
this document set for itself does not bend for a good-looking column.
Open gap count: 0.

Author: lidge-jun