Preserve converter tests during merge

Co-authored-by: JoshLove-msft <54595583+JoshLove-msft@users.noreply.github.com>

Author: Copilot

.chronus/changes/build-native-typescript-declarations-2026-9-2-18-10-52.md

@@ -0,0 +1,9 @@
+---
+changeKind: internal
+packages:
+  - "@typespec/react-components"
+  - "@typespec/playground-website"
+  - "@typespec/spec-dashboard"
+---
+
+Generate Vite library declarations with the native TypeScript 7 CLI instead of a plugin using the JavaScript compiler API.

.chronus/changes/build-native-typescript-declarations-2026-9-2-18-38-25.md

@@ -0,0 +1,8 @@
+---
+changeKind: internal
+packages:
+  - "@typespec/astro-utils"
+  - "@typespec/website"
+---
+
+Use native TypeScript 7 for workspace compilation while providing the TypeScript 6 JavaScript compiler API through the `@typescript/typescript6` compatibility alias for documentation tooling.