Live ISO work reduces boot waits and documents signature verification

Quattro ISO commits attributed to Emir Beganovic, with emirb listed as a participant, make x86_64 media discovery wait for the live medium instead of every device and start the installer without waiting for queued boot jobs. A companion change prevents console setup from racing the installer. The reported timing improvements come from measurements on an MSI Z690; aarch64 retains full device settling. omacom/omarchy-iso@bb5a2b73d237 omacom/omarchy-iso@a42d9fb5b409 omacom/omarchy-iso@7c2593dd9d01

Other committed ISO changes prevent an existing partition from being mistaken for a new one when its table cannot be read, and document detached-signature verification with GnuPG using the signing key's full fingerprint. These are Quattro development-history changes, not evidence of a newly published ISO release. omacom/omarchy-iso@aec6bb1ed1f1 omacom/omarchy-iso@647c9f73ba8d