- Add legacyAPI.js service for authentication and deployment management
- Add deployments.js routes for device listing
- Add FEATURE-SENSORS-SYSTEM.md spec
- Add bug report: set_deployment missing deployment_id in response
- Add test scripts for Legacy API (create_deployment, find_deployments)
- Update beneficiaries.js to return deploymentId
BUG: Legacy API set_deployment returns {"ok": 1} but does NOT return
deployment_id. Waiting for Robert to fix this before we can auto-create
deployments for new beneficiaries.