* fix(native): preserve Mach-O target selection in macOS tools
* fix(native): retain exact Mach-O slice signature coverage
* fix(native): admit x86_64 LIB64 signature selectors
* test(native): match signature checks to actual slices
* fix(native): recognize vtool refusals on private Mach-O aliases
Match vtool's container refusal to the operand the command received so a
parenthesized universal path keeps completed facts and the refusal
limitation. Expect codesign -a only when the target format is universal.
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Co-authored-by: Cursor Agent <[email protected]>
