Preserve original RegularFileCleanupFailure capabilities when registration
inspection or maintenance planning has no caller-supplied resource scope.
Keep scoped diagnostics with the scope that already retained the descriptor.
Cover configuration and policy sources, completed and malformed-UTF8 reads,
all four exported reader/planner boundaries, exact descriptor retry after
pathname replacement, no subsequent execution, and scoped cleanup retry.
Validation: 79 tests across four focused files; the historical baseline fails
all 16 new ownership-transfer controls with eight existing/scoped controls
passing. check:fast, format:check, test discovery and six isolated completed
public doctor comparisons passed. Scoped source review found no blocker.
Real temporary descriptors and injected close rejection on macOS arm64 /
Node24.18.0; no native Windows/Linux close faults or provider verification.
Fixes#4910
morluto
823521085a