The archive readers already keyed every object on releases/tag/<attempt>;
the writers still keyed them on the plain payload tag, so a stable run
wrote releases/tag/vX.Y.Z/ while publish read releases/tag/rc.N-vX.Y.Z/
and found nothing. Derive one archive ref at admission (validate emits
archive-tag, jobs export HERMES_ARCHIVE_TAG) and use it at every writer
and reader of a releases/tag/<x>/ key in the stable path. The plain
vX.Y.Z keeps naming the payload identity: build stamps, package
versions, feed versions, and GitHub release bodies. Canary and channel
builds keep archive == payload tag, so their keys are unchanged.
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