Fills the gap updates-and-distribution.md always deferred: how versions
are actually detected, pinned, and reverted, and how cves.json gets real
data. Core decisions: floating tag stays the channel while the live
compose pins the digest (making detection possible and rollback honest),
and CVE scanning runs as a LibrePortal-orchestrated ephemeral Trivy
container (no host binary, no always-on scanner app).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>