The macOS installer accepted any bundle that passed `codesign --verify`
and whose `Info.plist` said `com.cryptic-apps.hopper-web-4`. An ad-hoc
signed bundle with that identifier satisfies both, so a substituted DMG
could be copied to ~/Applications and launched.
Verify a pinned code requirement instead, covering the sealed bundle
identifier and the signing team together, and report a distinct
`publisher_verification_failed` code so a vendor key change is not
confused with a corrupt package.
650237efb0