Brings MOSAIC_GIT_IDENTITY (per-seat git authorship) onto the delivery
branch, which had none of it. The branch carried W-F7's FLEET_SEAT seam in
the same launcher file; the two auto-merged cleanly.
Three single-hunk conflicts resolved:
- pr-merge.sh: kept branch policy allowing main OR next (next is the
release stream).
- test-ci-queue-wait-tristate.sh: kept the branch's 4 added merge-readiness
assertions; merge base and main both had zero, so nothing of main's is
reverted.
- package.json test:framework-shell: union of both enumerations, 50 entries,
no test dropped from either side. Picks up main's test-start-agent-session.sh
and test-fleet-units.sh, which are the guards for the identity key.