The language-agnostic verifier contract

Ablation lab: a verifier coupled to a Python test runner fails on a fixed Node project with 0 tests run. Decouple the harness from language-specific runners with the evaluation.sh exit-code contract, ablate the contract layer across Python, Node and Go projects to measure the delta (3 of 3 vs 1 of 3 fixed projects), and test four exit-code traps.

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