dc-mirror: note mirror.uoregon.edu as preferred upstream (future) ...

Operator perf note (2026-07-25): mirror.uoregon.edu/ubuntu/ is the closest/fastest
mirror for this deployment -> prefer it over archive.ubuntu.com for the MAIN archive
debmirror in a future mirror-tuning pass. Header comment ONLY (not applied; does not
change the generated sync unit). Scoped to the main archive -- the UCA cloud-archive
host is separate and uoregon does not mirror it.

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

Mirrors installed both racks, syncs RUNNING; dc1 edge pf incident resolved; HOME fix (harness 19) ...

Item 9: fresh dc1 edge passed no LAN traffic -- pf ruleset never
regenerated after v4 addressing (set-interface reloads the interface,
not the filter; dc0 masked by 07-20 plugin work). configctl filter
reload -> egress 0%/301. Appendix-A + standup-DoD + script amendment
queued to stage close. Item 10: installs PASS 15/15 both racks, first
sync HOME-under-systemd failure fixed in the unit (T19), reinstalls +
syncs running (dc0 400M/dc1 343M in the first minute). Ledger in-flight
entry added; CURRENT-STATE same-commit.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VUjEb7onHpdqFHUnio6iVw

dc-mirror.sh shipped (D-135 item 1): per-DC apt+UCA mirror, harness 18/18, gauntlet 77 ALL GREEN ...

Site-keyed (dc0/dc1 MEASURED rows), check/install/sync; net layer = D-134
utility .4 alias + default route via the DC edge (egress path MEASURED
working; edge DNS answers). debmirror GPG-verified jammy triple + UCA
caracal, nginx on the utility address, daily timer, niced/idle-IO. Install
fails loud on missing packages with the exact apt line (net-first ordering
resolves the no-egress chicken-and-egg). Gauntlet capture + CURRENT-STATE
same-commit.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VUjEb7onHpdqFHUnio6iVw