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-vali
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`.