fix(build): resolve SEA build failures across platforms

- Add missing @socketsecurity/build-infra dependency to node-sea-builder
- Fix Windows PowerShell syntax error in build-sea workflow by adding shell: bash directive

Author: jdalton

.github/workflows/build-sea.yml

@@ -126,6 +126,7 @@ jobs:
 
       - name: Build WASM assets on cache miss
         if: steps.yoga-cache.outputs.cache-hit != 'true' || steps.ai-cache.outputs.cache-hit != 'true' || steps.onnx-cache.outputs.cache-hit != 'true'
+        shell: bash
         run: |
           echo "⚠️  WASM cache miss detected - building from source"
           echo "This will take 30-60 minutes. Consider running build-wasm.yml workflow to prime cache."

packages/node-sea-builder/package.json

@@ -1,4 +1,7 @@
 {
+  "dependencies": {
+    "@socketsecurity/build-infra": "workspace:*"
+  },
   "description": "Native Node.js SEA binary builder (fallback)",
   "devDependencies": {
     "vitest": "3.0.0"