cog

1af85f08 - fix: review cleanup - validation, schema desc, template comment, MRO walk in Rust

fix: review cleanup - validation, schema desc, template comment, MRO walk in Rust - Skip duplicate validation when both run: and predict: set - Fix train description in JSON schema - Clarify cog.yaml template comment - Fix fragile no_predictor.txtar assertion - Walk MRO in Rust coglet for multi-level inheritance support