fix: add name field to generated SKILL.md frontmatter

[socksy]

npx skills add tower/tower-cli reported "No skills found" even though skills/tower/SKILL.md exists. The installer requires both name and description in the frontmatter, and ours had only description.

This adds name: tower to the generator's frontmatter header in skill.rs, so every future tower skill generate emits it, and regenerates the checked-in skills/tower/SKILL.md to match. The generated body is unchanged — the diff is the single added line.

[coderabbitai]

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