Records the docker-dev live gate: 8/8 checks pass (check 4 with a documented
limitation). The gate caught four real defects every offline test missed — the
NU1101 packageSourceMapping gap, the ASPNETCORE_HTTP_PORTS re-bind, the empty
address space on boot-from-cache, and the cache not repopulating on
RestoreApplied — all fixed on-branch with regression tests. Two limitations
documented as follow-ups: no replication back-fill of a fully-wiped node, and
oplog growth on default-OFF nodes.