build-cs-skill
CodeStable skill authoring protocol. Use when creating, refactoring, simplifying, or reviewing cs-* skills under plugins/codestable/skills or .claude/skills. Applies the prompt-as-code framework: classify the skill, define Spec/types/state machine, separate operator rules from references, add machine-checkable contracts, and design decision fixtures. Do not use for normal feature implementation; use cs-feat/cs-issue/cs-docs for product work and eval-cs-skill for full measured experiment loops.