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bc9fb6d403
When a user@ token resolved to more than one DB row, ACL and SSH
rules referencing it were silently dropped at compile time, leaving
clients with SSHPolicy={rules: null} and no signal to the admin.
Validate every Username reference in groups, tagOwners,
autoApprovers, ACLs and SSH rules at NewPolicyManager and SetPolicy
and return ErrMultipleUsersFound. Missing-user tokens stay tolerant
per #2863.
Updates #3160