fix(ci): stabilize runners

.github/workflows/ci.yml

@@ -14,6 +14,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          submodules: recursive
 
       - name: Setup Node.js
         if: matrix.runtime == 'node'
@@ -26,7 +28,9 @@ jobs:
         if: matrix.runtime == 'bun'
         uses: oven-sh/setup-bun@v2
         with:
-          bun-version: "1.3.x"
+          # bun.sh downloads currently fail with:
+          # "Failed to list releases from GitHub: 401" -> "Unexpected HTTP response: 400"
+          bun-download-url: "https://github.com/oven-sh/bun/releases/latest/download/bun-linux-x64.zip"
 
       - name: Setup Node.js (tooling for bun)
         if: matrix.runtime == 'bun'
@@ -93,6 +97,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          submodules: recursive
 
       - name: Select Xcode 26.1
         run: |