chore(pr-workflow): add social-ai team to MetaMask Mobile codeowners overlay

[xavier-brochard]

Description

Adds the social-ai team entry to the MetaMask Mobile pr-codeowners overlay, mapping the social-ai label to social-ai-team for automated reviewer assignment.

Type of Change

• New skill
• Skill improvement/update
• Bug fix
• Documentation update
• Other (please describe):

Skill Details (if adding a new skill)

Provider Name: N/A
Skill Name: pr-codeowners
Brief Description: N/A — updating existing overlay

Checklist

• I have read the CONTRIBUTING.md guidelines
• My skill follows the SKILL_TEMPLATE.md format
• I have tested this skill with an AI agent
• My skill does not contain any secrets, private keys, or sensitive data
• I have added appropriate documentation
• My changes don't break existing skills

Testing

Verified the entry follows the existing table format in domains/pr-workflow/skills/pr-codeowners/repos/metamask-mobile.md and is correctly placed in alphabetical-ish order between rewards and design-system-engineers.

Additional Context

This mirrors the pattern of all other team entries in the overlay table.

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