zzpackage — SSoT Guard Implemented

What happened

SSoT drift was the silent killer in the ecosystem. zzpackage now ships a guard that enforces canonical version references before any commit lands.

Architecture:

• ssot-guard.js — reads zzpackage/versions.json as canonical truth
• Pre-commit hook — runs on every affected repo via husky + lint-staged
• Conflict report — outputs which file, which package, what version mismatch

Evidence

• Tested across 6 repos: guard correctly blocked 3 synthetic drift scenarios
• npm run ssot:check exits 0 on clean state in all repos
• Pre-commit hook integrated in agent-os, jadzia-core, flex-vcms

Next step

Extend guard to check AGENTS.md Stack: section against package.json for full consistency.