Shard macOS unit tests and split E2E tests into three shards

.github/workflows/tests-pr.yml

@@ -160,7 +160,7 @@ jobs:
         node: [ '22.12.0', '24.1.0', '26.1.0' ]
         shard: [ '' ]
         include:
-          # Add sharding for Windows jobs to reduce wall-clock time
+          # Add sharding for Windows and macOS jobs to reduce wall-clock time
           - os: windows-latest
             node: '22.12.0'
             shard: '1/2'
@@ -179,8 +179,26 @@ jobs:
           - os: windows-latest
             node: '26.1.0'
             shard: '2/2'
+          - os: macos-latest
+            node: '22.12.0'
+            shard: '1/2'
+          - os: macos-latest
+            node: '22.12.0'
+            shard: '2/2'
+          - os: macos-latest
+            node: '24.1.0'
+            shard: '1/2'
+          - os: macos-latest
+            node: '24.1.0'
+            shard: '2/2'
+          - os: macos-latest
+            node: '26.1.0'
+            shard: '1/2'
+          - os: macos-latest
+            node: '26.1.0'
+            shard: '2/2'
         exclude:
-          # Exclude the non-sharded Windows entries (replaced by sharded ones above)
+          # Exclude the non-sharded Windows and macOS entries (replaced by sharded ones above)
           - os: windows-latest
             node: '22.12.0'
             shard: ''
@@ -190,6 +208,15 @@ jobs:
           - os: windows-latest
             node: '26.1.0'
             shard: ''
+          - os: macos-latest
+            node: '22.12.0'
+            shard: ''
+          - os: macos-latest
+            node: '24.1.0'
+            shard: ''
+          - os: macos-latest
+            node: '26.1.0'
+            shard: ''
     steps:
       - uses: actions/checkout@v6
         with:
@@ -228,7 +255,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        shard: ['1/2', '2/2']
+        shard: ['1/3', '2/3', '3/3']
     steps:
       - uses: actions/checkout@v6
         with: