Exsqueektion API documentation

Read the public documentation.

• Markdown handoff
• JSON Schema
• Game

Updating

Edit INTEGRATIONS_API_HANDOFF.md and, when the contract changes, integrations-v1.schema.json. Push to main; GitHub Pages rebuilds the public documentation automatically. index.md includes the handoff file, so the page and downloadable Markdown share one source.

Keep API credentials out of this repository. Consumers obtain their API key separately from the service operator.