Fix enumeration & typos in README.md

[carsonkahn-external]

[skip-validate-pr]

References: Contributing guide · Skill authoring guide · Agent Skills spec

What changed

Fixed numbering & typos in README

Why

Hygeine

Notes

n/a

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Automated checks

Enforced by CI (npm run validate:skills) per the Agent Skills spec:

• Directory is one level deep, named in kebab-case (max 64 chars), contains SKILL.md
• Frontmatter name matches directory name; description is present, ≥ 20 words, ≤ 1024 characters, and includes trigger language
• Body is non-empty and under 500 lines
• Name uses gerund form ⚠ (warning — does not block merge)