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Fix iPoseProof on recursive lemmas (fix #274)

@robbertkrebbers suggested fixing #274 (closed) by making IntoEmpValid instances Transparent. It turns out also one redex of tac_pose_proof must be exposed to the guardedness checker; making such a lemma transparent seems a bit ugly. I wonder if this application should be built in Ltac instead, but that's up to @robbertkrebbers.

Nevertheless, this fix appears technically correct, and has no excess transparency. I also made proofs of IntoEmpValid instances more manual, even tho that's not strictly required, because they're Defined and their exact body matters.

Moreover, I modified the testcase in #274 (closed) to use all instances of IntoEmpValid.

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