FleetConfigWithDefaultsPreservesEveryComponentTest was added on main after
the sleep-guard commit was cherry-picked, specifically to catch this exact
rebase hazard (a withDefaults() call silently rebinding to a stale-arity
back-compat constructor). Its baseValues() map didn't know about the new
idleSleepGuard component yet, so the coverage test itself failed the
name-drift check. Add a real, non-null value for it, consistent with how
the sibling ConfigRefTopLevelReportingCoverageTest already covers it.
Dai Ha
6442a583ae