- update advances the pinned rev, rewrites the external area via staging+swap,
reports added/changed/removed per type; include mode holds its selection,
vanished include entries abort loudly with the tree untouched
- all mode pulls new upstream items automatically; collision checks re-run on
every update and honor the rename map
- diff is strictly read-only (temp dir outside the repo) and surfaces new
upstream items as available-but-not-selected
- remove deletes external area + lockfile entry and prunes empty external root
- update --all reports per source and surfaces every failure
m3ta-chiron
a755d138da