feat(validate): add bundle dependencies validation

Add validation script to detect dependency misconfigurations:
- Bundled packages should be in devDependencies
- External packages should be in dependencies/peerDependencies
- Filters subpath imports, code fragments, and dist/external directory

Integrated into scripts/check.mjs for CI validation.

Author: jdalton

scripts/check.mjs

@@ -42,6 +42,13 @@ async function main() {
           ...(process.platform === 'win32' && { shell: true }),
         },
       },
+      {
+        args: ['scripts/validate-bundle-deps.mjs'],
+        command: 'node',
+        options: {
+          ...(process.platform === 'win32' && { shell: true }),
+        },
+      },
     ]
 
     const exitCodes = await runParallel(checks)