chore: add .project.json for portfolio

[alexcatdad]

Summary

• Adds .project.json metadata consumed by alexcatdad.github.io snapshot generation
• Schema: project-meta.schema.json

🤖 Generated with Claude Code

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/add-project-meta

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