Anchors the sb-it-1-dt session's outputs in this repo so continuation
does not depend on jarvis-brain (P0, not retained): ~/.mosaic tree model
as-built (incl. fleet/agents store + *.env.generated overlays), decisions
register (MOSAIC-D-001/-02 pending ruling, tooling-migration direction,
watcher-provisioning-at-instantiation), #1295 pointers, sequenced open
work queue, and rules for tonight's homelab agents (lane next, #1280
attribution, evidence-file protection).
