fix: harden modifier resource lifecycle

Validate required modifier parameters, refresh modifier state from parent state_params, preserve operation timeout and log level during update, and normalize nested modifier payloads as JSON. Document the modifier contract, vcOrg/vcNsxt usage, and the intentionally unsupported rollback semantics.

TOOLS/resource-generator/internal/loader/loader.go

@@ -70,6 +70,11 @@ func LoadSpecs(dir string) ([]types.GenResource, []types.GenSubresource, []types
 					Params:        ConvertParams(op.Params),
 				}
 				modifier.SchemaParams = modifier.Params
+				for idx := range modifier.SchemaParams {
+					if modifier.SchemaParams[idx].HasSubParams {
+						modifier.SchemaParams[idx].IsJson = true
+					}
+				}
 				params.Analyze(&modifier.UsesBool, &modifier.UsesInt64, &modifier.UsesString, &modifier.HasDefaults, &modifier.NeedsBoolDefault, &modifier.NeedsInt64Default, &modifier.NeedsStringDefault, modifier.SchemaParams)
 				modifier.NeedsJsonPlanMod = params.AnalyzeJsonPlanMod(modifier.SchemaParams)
 				modifiers = append(modifiers, modifier)