feat: WBG Open Source compliance

[avsolatorio]

Description

This PR adds the documentation and files needed for World Bank Group (WBG) Open Source Code Catalog endorsement.

Changes

License & governance

• LICENSE: Updated copyright to "The World Bank Group" and appended the World Bank IGO Rider
• WB-IGO-RIDER.md: Full text of the IGO Rider
• CITATION.cff: Citation metadata for the software

Community & contribution

• CODE_OF_CONDUCT.md: Contributor Code of Conduct
• CONTRIBUTING.md: Contribution guidelines

Third-party licenses

• THIRD_PARTY_LICENSES.md: Third-party dependency licenses grouped by license type
• scripts/generate_licenses.py: Script to regenerate the license list
• pyproject.toml: Added pip-licenses as a dev dependency and poe licenses task

Documentation

• README.md: Restructured for clarity (removed emojis, clearer sections, audience note)
• DEVELOPMENT.md: Added section on regenerating THIRD_PARTY_LICENSES.md

Regenerating the license list

uv run poe licenses

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Base branch: feat/improve-tool-descriptions