chore(skills): bump skill versions and add version check

[goldmedal]

Summary

• Bump wren-generate-mdl and wren-usage in skills/ to v2.0 with version check sections
• Fix archive skills to point version check URL to skills/versions.json
• Bump archive wren-generate-mdl to 1.5 and wren-usage to 1.3

Test plan

• Verify skills/versions.json matches SKILL.md frontmatter versions
• Verify skills-archive/versions.json matches SKILL.md frontmatter versions
• Run bash skills-archive/check-versions.sh to confirm parity

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