Adds check-deps.ts which ensures backend/package.json doesn't duplicate any dependencies already provided by backend/diachron/package.json. Integrated into backend/check.sh. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Update paths in sync.sh, master/main.go, and CLAUDE.md to reflect the directory rename. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>