feat(data): add schema types and bind command for code generation

[jheddings]

Summary

• Adds FieldType, FieldSchema, and ModelSchema types to the SDK for describing Workday Extend business object models
• Adds everywhere bind [APP_DIR] CLI command that reads .businessobject files and generates:
  • TypeScript interfaces (models.ts)
  • Runtime schema metadata (schema.ts)
  • Typed useQuery/useMutation hook wrappers per model
  • Barrel re-export (index.ts)
• Generated output goes to <plugin>/everywhere/data/; Extend app path is saved to everywhere/.config.json for subsequent runs
• Parser and generator are fully decoupled from the SDK runtime (no cross-boundary imports)

This is Phase 1 of the data bindings feature. Phase 2 (React hooks & provider) and Phase 3 (local data service) will follow.

Test plan

• 77 tests pass across 12 test files
• just check passes (typecheck + lint)
• Smoke tested everywhere bind against real WFAA Extend app — generates correct types and hooks
• Verify everywhere bind . works with models in plugin's own model/ directory
• Verify re-running everywhere bind (no args) reads from saved config

🤖 Generated with Claude Code