Live-verified against real infrastructure: Kopia's real repo/disk,
PBS's real datastore path, os_update role's real batch/abort behavior
against the actual Ansible code, and the real tag-driven
roles_metadata.yml mechanism behind Layer 1's rebuild claim. Caught a
real KB staleness in the process (PBS datastore usage, 3 weeks stale)
and fixed it properly - removed the point-in-time number entirely
rather than refreshing it, since a data-snapshot doesn't belong in
Trilium at all per the existing content-philosophy rule. Replaced
both mermaid diagrams with real branch/decoupling-shaped Nextcloud
diagrams. All 3 source KB notes stamped.
