test(source-control): cover SSH alias grouping across checkouts

Two checkouts that reach github.com through different SSH aliases now
refine to the same repository grouping key. Aliases for non-GitHub hosts
keep their alias-based key, documenting the current GitHub-only scope.
4fa05b4036roodboi committed on 10/23/2026, 11:36:32 PMparent926641c

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