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Phase 6: skill.New constructor satisfying the agent.Skill contract; instruction-only skills; ordered additive composition; skill/clock (injectable-clock time tools) and skill/calc (recursive-descent arithmetic evaluator) as ready-made examples with full test suites incl. an agent-loop round trip. ADR-0013; README skills section + matrix synced. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>