feat: ESPI 4.0 Schema Compliance - Phase 0.6: Customer Domain Enums

[dfcoffin]

Summary

Implements customer domain enumerations from customer.xsd with proper JAXB/Jakarta XML binding annotations and comprehensive XSD documentation.

Customer Domain Enums (10 enums, 77 total values):

• CustomerKind (15 values) - Customer classifications: residential, commercialIndustrial, residentialAndCommercial, etc.
• SupplierKind (6 values) - Supplier types: utility, retailer, lse, mdma, msp, other
• ServiceKind (11 values) - Service types: electricity, gas, water, heat, refuse, sewerage, rates, tvLicence, internet, time, other
• EnrollmentStatus (3 values) - Demand Response program enrollment: unenrolled, enrolled, enrolledPending
• NotificationMethodKind (5 values) - Customer notification methods: call, email, letter, ivr, other
• MeterMultiplierKind (6 values) - Meter multiplier types: kH, transformerRatio, kR, kE, ctRatio, ptRatio
• RevenueKind (7 values) - Revenue accounting classifications: residential, nonResidential, commercial, industrial, irrigation, streetLight, other
• ProgramDateKind (4 values) - DR program date types: enrollment, de-enrollment, termination dates
• CRUDOperation (4 values) - CRUD operations: 0=CREATE, 1=READ, 2=UPDATE, 3=DELETE
• MediaType (16 values) - IANA media types: application/json, application/pdf, text/csv, image/jpeg, etc.

Implementation Details

All enums include:

• Apache License 2.0 header (copyright 2025 Green Button Alliance, Inc.)
• Package: org.greenbuttonalliance.espi.common.domain.customer.enums
• JAXB/Jakarta XML binding annotations (@XmlType with namespace="http://naesb.org/espi/customer")
• getValue() and fromValue() methods with IllegalArgumentException for invalid values
• Comprehensive Javadoc from XSD documentation with line numbers
• Type-safe enum constants (String for most, int for CRUDOperation)

Test Updates

Updated test files to use XSD-compliant enum values:

• CustomerKind: COMMERCIAL → COMMERCIAL_INDUSTRIAL
• SupplierKind: Uppercase values → lowercase (utility, retailer, etc.)
• CustomerKind: Uppercase values → lowercase (residential, enterprise, etc.)

Testing

• All tests: 781/781 passed ✓
  • Unit tests: 638/638 passed ✓
  • Integration tests: 143/143 passed ✓ (with Docker/TestContainers)
• No breaking changes
• Clean compilation verified

Schema Compliance

Per ESPI 4.0 specification (NAESB REQ.21) customer.xsd:

• CustomerKind: lines 1687-1772
• SupplierKind: lines 2231-2271
• ServiceKind: lines 2074-2135
• EnrollmentStatus: lines 1808-1833
• NotificationMethodKind: lines 1961-1996
• MeterMultiplierKind: lines 1920-1960
• RevenueKind: lines 2028-2073
• ProgramDateKind: lines 1997-2027
• CRUDOperation: lines 1557-1591
• MediaType: lines 1834-1919

Related to #101

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