8c26f16716
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Implement 4 builtin judges for eval framework: - frontmatter-compliance: validates YAML frontmatter with $status field, score = stepsValid / stepsTotal - token-stats: aggregates Usage from step nodes, always score 1.0 (informational only) - upstream-consumption: LLM-as-judge stub (score 0, TODO) - hallucination: LLM-as-judge stub (score 0, TODO) Infrastructure: - judge/builtin/read-steps.ts — shell out to uwf step list - judge/builtin/types.ts — BuiltinJudge, BuiltinJudgeOutput - runner/collect.ts — dispatch builtin judges by name 9 new tests (frontmatter validation + token aggregation) Refs #71