* fix(github): resolve owner/repo through SSH Host aliases (#10284)
Expand OpenSSH Host → HostName via ssh -G before classifying github.com
identity so PR merge works when origin is git@alias:owner/repo.git.
Transport URLs stay unchanged so IdentityFile selection is preserved.
Do not long-negative-cache indeterminate ssh -G failures.
* fix(github): harden SSH alias resolution
