generic source-to-infospace generator

src/infospace_bench/profiles/general-knowledge/contracts/evaluation.contract.md

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+# Evaluation Contract
+
+Each evaluation must be Markdown with YAML frontmatter containing:
+
+- `artifact_id`
+- `evaluator`
+- `evaluated_at`
+- `scores`
+
+Scores should include groundedness and usefulness on a 0 to 5 scale.