fix: resolve CI OOM by fixing bloated package-lock.json

The package-lock.json was incorrectly regenerated with 1170 entries
instead of 452 (2.5x bloat) when cross-spawn was added to root.
This caused npm install to run out of memory on GitHub Actions.

- Remove unnecessary cross-spawn from root package.json
- Restore package-lock.json to proper workspace structure
- Remove NODE_OPTIONS workaround from workflow files

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package.json

@@ -29,8 +29,5 @@
     "test:headed": "npm run test:headed --workspace=apps/app",
     "test:server": "npm run test --workspace=apps/server",
     "test:server:coverage": "npm run test:cov --workspace=apps/server"
-  },
-  "dependencies": {
-    "cross-spawn": "^7.0.6"
   }
 }