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Dana Jansens
057ef0d458
Update the orphan rule to require a name to be defined within, or by, the same scope as the impl declaration. Since libraries can not be nested, this also enforces the old rule, but rejects more impl declarations. In particular, it rejects an impl declaration in a generic context which would have no way to provide a value for the generic bindings it inherited from its enclosing scope, making the impl unusable. Discussed in open discussion [2026-05-04](https://docs.google.com/document/d/1mjllGO3ZCL4qGt9uJHUtcxKoHAGEY7Y999ie4EtBWB8/edit?tab=t.3ifnhz83n73d#heading=h.p45zfugbmdih).