Support remove-model in TypeSpec Java emitter (#11658)

## Summary

- expose `remove-model` as a string-array Java emitter option
- forward configured model names to Fluent management generation
- add emitter schema and Java option parsing coverage

## Validation

- `npm run build`
- `npm run format`
- `npm run test:emitter`
- targeted `EmitterOptionsTests`

---------

Copilot-Session: eb21d30c-f82f-43a1-8cc3-cb2701293679

Author: weidongxu-microsoft

.chronus/changes/http-client-java-remove-model-option-2026-08-13.md

@@ -0,0 +1,8 @@
+---
+changeKind: feature
+packages:
+  - "@typespec/http-client-java"
+---
+
+Support removing models from management clients with the `remove-model` emitter option.
+```

packages/http-client-java/generator/http-client-generator/src/main/java/com/microsoft/typespec/http/client/generator/fluent/TypeSpecFluentPlugin.java

@@ -86,6 +86,9 @@ public TypeSpecFluentPlugin(EmitterOptions options, boolean sdkIntegration) {
         if (options.getRemoveInner() != null) {
             SETTINGS_MAP.put("remove-inner", options.getRemoveInner());
         }
+        if (options.getRemoveModel() != null) {
+            SETTINGS_MAP.put("remove-model", options.getRemoveModel());
+        }
         if (options.getPreserveModel() != null) {
             SETTINGS_MAP.put("preserve-model", options.getPreserveModel());
         }

packages/http-client-java/generator/http-client-generator/src/main/java/com/microsoft/typespec/http/client/generator/model/EmitterOptions.java

@@ -49,6 +49,7 @@ public class EmitterOptions implements JsonSerializable<EmitterOptions> {
     private String renameModel;
     private String addInner;
     private String removeInner;
+    private String removeModel;
     private String preserveModel;
     private Boolean generateAsyncMethods;
     private String propertyIncludeAlways;
@@ -190,6 +191,10 @@ public String getRemoveInner() {
         return removeInner;
     }
 
+    public String getRemoveModel() {
+        return removeModel;
+    }
+
     public String getPreserveModel() {
         return preserveModel;
     }
@@ -278,6 +283,8 @@ public static EmitterOptions fromJson(JsonReader jsonReader) throws IOException
                 options.addInner = reader.getNullable(EmitterOptions::getStringOrList);
             } else if ("remove-inner".equals(fieldName)) {
                 options.removeInner = reader.getNullable(EmitterOptions::getStringOrList);
+            } else if ("remove-model".equals(fieldName)) {
+                options.removeModel = reader.getNullable(EmitterOptions::getStringOrList);
             } else if ("preserve-model".equals(fieldName)) {
                 options.preserveModel = reader.getNullable(EmitterOptions::getStringOrList);
             } else if ("generate-async-methods".equals(fieldName)) {

packages/http-client-java/generator/http-client-generator/src/test/java/com/microsoft/typespec/http/client/generator/model/EmitterOptionsTests.java

@@ -41,4 +41,15 @@ public void testRemoveInner(String json) throws IOException {
         Assertions.assertEquals(1, options.getRemoveInner().split(",").length);
         Assertions.assertEquals("NginxConfigurationResponse", options.getRemoveInner());
     }
+
+    @ParameterizedTest
+    @ValueSource(
+        strings = {
+            "{\"remove-model\":[\"VirtualMachineExtensionImage\",\"VirtualMachineImage\"]}",
+            "{\"remove-model\":\"VirtualMachineExtensionImage,VirtualMachineImage\"}" })
+    public void testRemoveModel(String json) throws IOException {
+        EmitterOptions options = EmitterOptions.fromJson(JsonReader.fromString(json));
+        Assertions.assertEquals(2, options.getRemoveModel().split(",").length);
+        Assertions.assertEquals("VirtualMachineExtensionImage,VirtualMachineImage", options.getRemoveModel());
+    }
 }