refactor: rename skills dir

[troian]

Description

Closes: #XXXX

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[coderabbitai]

Important

Review skipped

Review was skipped as selected files did not have any reviewable changes.

💤 Files selected but had no reviewable changes (3)

• .agents/skills/setup-env/SKILL.md
• .agents/skills/smartcontracts/SKILL.md
• .agents/skills/vanity/SKILL.md

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Reviewing files that changed from the base of the PR and between 319be8e and 3ec6c1d.

📒 Files selected for processing (3)

• .agents/skills/setup-env/SKILL.md
• .agents/skills/smartcontracts/SKILL.md
• .agents/skills/vanity/SKILL.md

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✨ Finishing Touches

🧪 Generate unit tests (beta)

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