The non-traversable GH_ProtectedBy edge represents that a branch protection rule applies to a specific branch. This edge links protection rules to the branches they govern. Understanding which protections apply to a branch is critical for determining the effective access model — protections such as required reviews, status checks, and push restrictions directly impact who can modify a branch. This edge is consumed by the computed branch-access edges to determine effective push access; the computed GH_CanWriteBranch and GH_CanEditProtection edges carry traversability instead.
