dc-cache-proxy.sh install dc1 executed on the DC1 rack (gated): apt-cacher-ng
3.7.4 active on the utility .4:3142, proxy serves archive + UCA (200/200). DC1
apt path is now unblocked for the build. CURRENT-STATE + changelog updated.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VUjEb7onHpdqFHUnio6iVw