copilot-cli-agent-customization

**WORKFLOW SKILL** — Create, update, review, fix, or debug Copilot CLI customization files (`copilot-instructions.md`, `AGENTS.md`, `*.instructions.md`, `*.agent.md`, `SKILL.md`, hook JSON, `plugin.json`, and plugin command files). USE FOR: authoring terminal-first customization workflows; troubleshooting why CLI instructions, skills, agents, hooks, or plug…

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