Fix CI: Convert reusable workflows to use workflow_call trigger

- Changed swift.yml, rust.yml, and node.yml from direct triggers to workflow_call
- This fixes the workflow configuration error causing immediate CI failures
- Reusable workflows must use workflow_call when invoked by other workflows

.github/workflows/node.yml

@@ -1,11 +1,7 @@
 name: Node.js CI
 
 on:
-  push:
-    branches: [ main ]
-  pull_request:
-    branches: [ main ]
-  workflow_dispatch:
+  workflow_call:
 
 jobs:
   lint:

.github/workflows/rust.yml

@@ -1,11 +1,7 @@
 name: Rust CI
 
 on:
-  push:
-    branches: [ main ]
-  pull_request:
-    branches: [ main ]
-  workflow_dispatch:
+  workflow_call:
 
 jobs:
   lint:

.github/workflows/swift.yml

@@ -1,11 +1,7 @@
 name: Swift CI
 
 on:
-  push:
-    branches: [ main ]
-  pull_request:
-    branches: [ main ]
-  workflow_dispatch:
+  workflow_call:
 
 env:
   DEVELOPER_DIR: /Applications/Xcode_16.3.app/Contents/Developer