Merge origin/main into l0lawrence-fix-python-emitter-invalid-types

Resolve conflict in tests/unit/test_typeddict.py (combine import blocks) and update Bug 1/Bug 3 regression fixtures to set is_typed_dict_only so models render under main's new is_used_in_operations_via_types gating (#11639).

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: 1a8cce88-1663-4cc6-a634-2e83e35d04b7

Author: l0lawrence

.chronus/changes/add-body-or-no-content-scenario-2026-8-14.md

@@ -0,0 +1,16 @@
+---
+changeKind: feature
+packages:
+  - "@typespec/http-specs"
+---
+
+Add scenario for an operation whose successful response is either a model body (`200`) or no content (`204`).
+
+```tsp
+op getBody(): {
+  @statusCode statusCode: 200;
+  @body layout: BlobLayout;
+} | {
+  @statusCode statusCode: 204;
+};
+```

.chronus/changes/add-python-post-paging-lro-with-body-test-2026-7-22-2-4-0.md

@@ -0,0 +1,7 @@
+---
+changeKind: internal
+packages:
+  - "@typespec/http-client-python"
+---
+
+Add mock API tests for the new ARM operation-templates scenarios (`postPagingLroWithBody`, `getLro`, `postActionPaging`, `markAsPageable`, `Legacy.routedGet`, and `Legacy.createOrReplaceOptionalBody`).

.chronus/changes/disable-vs-build-nuget-audit-2026-8-7.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "typespec-vs"
+---
+
+Disable NuGet package auditing during cross-platform Visual Studio extension builds so restores do not fail when the vulnerability feed is unavailable.

.chronus/changes/forward-python-package-index-environment-2026-8-7.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/http-client-python"
+---
+
+Forward package index and Python mirror environment variables to tox test environments so tests can install dependencies from configured feeds.

.chronus/changes/http-client-java-preserve-sdk-integration-properties-2026-08-12.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/http-client-java"
+---
+
+Preserve existing properties files for certain libraries during SDK integration.

.chronus/changes/http-client-java-remove-model-generation-2026-08-17.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/http-client-java"
+---
+
+Fix `remove-model` for TypeSpec management clients, including enum models.

.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.
+```

.chronus/changes/http-client-java-test-new-generated-clients-2026-08-13.md

@@ -0,0 +1,7 @@
+---
+changeKind: internal
+packages:
+  - "@typespec/http-client-java"
+---
+
+Add end-to-end tests for newly generated Java clients

.chronus/changes/http-client-java-update-node-dependencies-2026-08-13.md

@@ -0,0 +1,7 @@
+---
+changeKind: dependencies
+packages:
+  - "@typespec/http-client-java"
+---
+
+Update Node.js dependencies and regenerate Java test assets

.chronus/changes/java-premium-sample-client-routing-2026-08-12-13-27-00.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/http-client-java"
+---
+
+Fix Fluent Premium samples to use the correct service client for resource metadata suffixes.