[cschanhniem]

Summary

• BatchExperimentPriorityRanker: 11 fields, synthesis wave priority ordering for pilot packages
• 10 validation rules: BPR- prefix, pipeline_version+batch_id non-empty, CSR- prefix, ISO date, priority_method vocab (6: predicted_activity/structural_diversity/cost_efficiency/risk_stratified/novelty_first/expert_ranked), top_priority_candidates non-empty, priority_rationale non-empty and ≤400 chars, synthesis_wave ≥1, notes ≤300 chars
• 3 warnings: resource_constraint_considered=False, expert_ranked without notes, synthesis_wave >5
• 63 tests; BASELINE 5666->5729
• CLI: openamp-foundry batch-experiment-priority-ranker-check
• Implements Phase K K2 — records which candidates to synthesize first and why, complementing K1 CSR- (why candidates were selected)