e67ae16294
`argument-hint: [foo]` YAML-parses as a flow sequence (array), not a string. Downstream slash-command loaders that validate `argument-hint` as a string — notably GitHub Copilot CLI ≥ 1.0.65 — silently reject the skill on load, and the command disappears from the CLI menu. Wrap the value in double quotes so it parses as a string. No behaviour change on Claude Code.