Refs #4458, #4483.
Own admitted descriptors through final close, retain exact failed owners, and preserve physical read failures and cancellation reasons. Track stream coverage independently from delivered bytes and share the boundary across archive, Mach-O, hashing, and output readback consumers.
Capture exact filesystem identity and nanosecond timestamps, validate descriptor/path state before and after streaming, and enforce the captured byte count. Bound growing files to their captured size plus one byte using precise positional reads; keep unrepresentable display sizes explicitly unknown.
Reuse the captured-state comparison around Apple assetutil and retain existing reader cleanup ownership. Validation: focused reader and affected consumer suites, full static/architecture checks, and a compiled directory-read probe on Bun 1.3.14 passed. Includes same-size mutation, growth, truncation, cancellation, FIFO replacement, cleanup retry, ZIP identity forgery, ASAR and Mach-O coverage.
Keep rejected closes unresolved after descriptor invalidation and share concurrent close attempts. Preserve primary admission failures and transfer the exact failed handle owner into inventory scopes.
BREAKING CHANGE: ArtifactResourceScope file-handle owners require OwnedFileHandle. Root inventory sources retain their single cleanup owner.
morluto