Scaffold the Claude Code and Codex paper catalog

[MicroMilo]

Summary

• defines the initial Claude Code and Codex CLI scope and evidence classes
• adds a strict YAML catalog and JSON Schema with 19 reviewed seed papers
• generates README tables from the catalog
• adds validation, tests, linting, and GitHub Actions
• adds contribution guidance and a structured paper-suggestion form

Verification

• catalog validation: 19 papers
• generated README check: passed
• tests: 2 passed
• Ruff: passed
• git diff check: passed

Review focus

Please review the product naming, inclusion criteria, and fairness fields before merging. The schema is ready for future products without adding them to the v0.1 catalog.