## What changed
- Add a shared runtime preparer that validates native build receipts, source and
file digests, dependency closure, and output containment before copying the
required voice plugins and libraries.
- Add macOS-specific Mach-O inspection and relocation that removes build-time
runpaths, rewrites non-system dependencies relative to each loader, applies
development ad-hoc signatures, and records the resulting payload in
`runtime.json`.
- Close the state runtime explicitly in the clear-memories CLI test.
## Testing
- Add macOS tests covering relocation after the source prefix is removed and
fail-closed handling of invalid receipts, changed inputs, unsafe paths,
dependency conflicts, malformed Mach-O metadata, and failed transforms.
GitOrigin-RevId: 3be7a6fabf0135a57036cbb0a9a3e597096930fd
