Issue 5: Update Model base class and method execution

[adamhjk]

Refactor the Model base class, MethodDefinition, and MethodExecutionService to use Definitions and unified Data instead of ModelInputs and 4 artifact types.

Key Changes

• Update src/domain/models/model.ts:
  • MethodDefinition.execute(): Change signature from (input: ModelInput, context: MethodContext) to (definition: Definition, context: MethodContext)
  • MethodContext: Replace 4 repository fields with single dataRepository: UnifiedDataRepository
  • Add definitionRepository: DefinitionRepository to context
  • Update ModelDefinition:
    • Replace inputAttributesSchema with support for JsonSchema inputs
    • Remove resourceAttributesSchema, dataAttributesSchema (no longer needed)
  • Update MethodResult:
    • Remove: resource?, data?, file?, logs?, deleteResource?, deleteData?, deleteFile?, deleteLogs?
    • Add: dataOutputs: Array<{ name: string, content: Uint8Array, metadata: DataMetadata }>
• Update src/domain/models/method_execution_service.ts:
  • Accept Definition instead of ModelInput
  • Validate definition attributes against method schema
  • Write data artifacts with ownership (store definition in metadata)
  • Auto-increment data versions on each write
  • Create ModelOutput referencing data artifacts

Acceptance Criteria

• Methods receive Definition instead of ModelInput
• Method execution creates unified Data with proper metadata
• Data versioning works automatically
• Ownership validation enforced
• Unit tests updated and passing
• Integration test: execute method, verify data created with correct metadata

Dependencies

• Issue Issue 1: Create unified Data entity and repository #116 (Data entity)
• Issue Issue 2: Create Definition entity to replace ModelInput #117 (Definition entity)
• Issue Issue 3: Update ModelOutput to reference unified Data #118 (ModelOutput updated)

Files to Update

• src/domain/models/model.ts
• src/domain/models/method_execution_service.ts
• src/domain/models/method_execution_service_test.ts