[codex] Add CodeQL, archival metadata, and report docs

[jang1563]

Summary

• add CodeQL Python code-scanning workflow and README badge
• add Zenodo archival metadata for v0.1.1
• add a technical report and Hugging Face leaderboard Space plan
• update release checklist for CodeQL and Zenodo metadata checks

Validation

• .venv/bin/ruff check .
• .venv/bin/python -m json.tool .zenodo.json
• ruby -e "require 'yaml'; YAML.load_file('.github/workflows/codeql.yml')"
• .venv/bin/python -m pytest

[github-advanced-security]

You are seeing this message because GitHub Code Scanning has recently been set up for this repository, or this pull request contains the workflow file for the Code Scanning tool.

What Enabling Code Scanning Means:

• The 'Security' tab will display more code scanning analysis results (e.g., for the default branch).
• Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results.
• You will be able to see the analysis results for the pull request's branch on this overview once the scans have completed and the checks have passed.

For more information about GitHub Code Scanning, check out the documentation.