Allow named sets of base labels and exact suite names in one TOML file.
Keep KUNIT_LABEL as the selection interface and combine overlapping sets
without running a suite twice. Include an IO set for CDB, UNMAP and VDISK.
Share expansion between source listing and runtime module selection.
Validate requested sets against the supplied module manifests before any
module operation, then load their owners and dependencies as before.
Reject namespace conflicts, nested sets and incomplete selections.
List descriptions and expanded suites without a build or loaded modules.
Allow an alternate file through --label-config, record selected definitions
in reports, and cover source listing, configuration and module ordering.
