Raise CARGO_BUILD_JOBS to 3 on every event in the workspace test lane and
record the closed backlog#1601 experiment: the test-profile compile took
28m21s at 2 on a pull request and 16-23 min at 3 across three successful
main runs.
Merge the two Connect boundary jobs into connect-feature-boundaries. The
offline enrollment gate no longer exports a fresh CARGO_TARGET_DIR, so it
rebuilds only the rustfs crate on top of the restored ci-dev cache; the E2E
root is isolated by the feature gate and the dedicated binary name, not by
the target directory. The short-credential release guard is now
`cargo rustc -p rustfs --lib --features connect-e2e-short-credentials --
-C debug-assertions=off`, which trips the same cfg(not(debug_assertions))
compile_error against cached dev-profile dependencies instead of a cold
release check of the whole graph. Every assertion of both lanes is kept.
Update ci_gate.py and the ci-gates.md PR matrix for the merged job.
Chris