[cschanhniem]

Summary

• New schema: BenchmarkCard (BMC-) in src/openamp_foundry/evidence/benchmark_card.py
• 12 fields: bmc_id, pipeline_version, benchmark_name, measurement_target, split_strategy, cheap_enemy_baselines, evaluation_metrics, known_limitations, deprecated, created_date, last_updated_date, notes
• Controlled vocabs: VALID_MEASUREMENT_TARGETS (10), VALID_SPLIT_STRATEGIES (10), VALID_EVALUATION_METRICS (12)
• cheap_enemy_baselines ≥1 required (warns if <2): benchmark without declared cheap enemies cannot prove method beats trivial rules
• known_limitations ≥1 required: every benchmark has limitations; documenting zero is not allowed
• deprecated=True requires non-empty notes (explanation of why deprecated)
• 2 warnings: <2 cheap enemies, <2 known limitations
• 63 tests covering: valid records, ID/version, measurement_target+split, cheap enemy rules, eval metrics+limitations, deprecated+dates, validate_dict edge cases
• BASELINE 6646→6709
• Closes Phase C C2 — benchmark documentation is now machine-checkable; incomplete benchmark docs are blocked at schema level