Privsep splits repo ownership: hive-priv (root) fetches the hive-core-owned
meta/applied repos via nix, and hive-c0re (hive-core) fetches the agent-owned
proposed-config repos. git/libgit2's dubious-ownership guard rejects both
('repository path is not owned by current user'), failing every rebuild.
Install a root-trusted gitconfig with safe.directory=* in each service's
HOME; both already have read access — this only satisfies the guard.
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