Summary

Adds a focused repository-api-export-contract module for the programmatic access and export-bundle slice of issue #10.

This is intentionally narrower than the existing broad repository/versioning submissions. It validates:

• required scientific repository component coverage: manuscript, data, code, notebooks, results, protocols, and metadata
• deterministic component hashes plus a repository integrity root
• public REST API coverage for GET, POST, and PUT routes
• export route integrity-root requirements
• export bundle entries for manifest, API contract, reproducibility runbook, citation metadata, and component files
• Git-compatible CLI commands for clone, status, export, and route discovery

Validation

• npm test
• npm run demo
• git diff --check
• npm run demo:video

Demo artifacts: repository-api-export-contract/docs/demo.svg and repository-api-export-contract/docs/demo.mp4

/claim #10