magpie-write-skill

Author a new skill for the Apache Magpie framework, or update an existing one. Walks the user through the framework's skill shape (frontmatter, resources, placeholder convention, prompt-injection defences, Privacy-LLM gate-check) and validates via the framework's existing [tools/skill-and-tool-validator](../../tools/skill-and-tool-validator/). Scaffolds new skills via init_skill.py.