vendor add gains --exclude a,b,c (all mode minus those ids) as the mirror
of --include, for taking the majority of a source while dropping a few
items. Mutual exclusion with --include is a hard error, unknown ids fail
naming the available ones (generalized checkIDEntries).
vendor add and vendor select gain --types (allow-list) and --exclude-types
(deny-list) over the four content types. The filter is stored as the
optional, v2-compatible Selection.exclude_types field and survives vendor
update: new upstream items of an excluded type never enter the work
repository (unlike id expansion, which would silently re-admit them).
--types/--exclude-types replace the filter on select, absent flags keep
it, and --mode all clears it along with include/exclude.
Also fixes materializeTree to create the staging directory for an empty
selection — previously select-to-zero failed at the staging rename.
vendor select <name> --add/--remove/--mode all changes what a source
contributes without advancing the pinned rev: ids are validated against
the pinned upstream (typos abort listing available ids), collisions
re-run, renames from the lockfile are honored, and the external area is
rewritten via the same staging-swap as update. include mode grows and
shrinks the include list; all mode --remove moves ids onto exclude;
--mode all resets to everything. Failed selects mutate nothing.
Closes beads: agent-lib-cd3
m3ta-chiron