Demonstrates a bug in workerd's V2 fallback service protocol where rawSpecifier and attributes fields are never sent.

When using new_module_registry, the fallback service should receive:

• type: How the module was imported ("import", "require", "internal")
• specifier: Normalized URL of the module
• rawSpecifier: Original specifier as written in source code
• referrer: Normalized URL of the importing module
• attributes: Import attributes (e.g. { type: "json" })

Actual behavior: Only type, specifier, and referrer are sent.

In src/workerd/jsg/modules-new.c++:807-818, resolveWithCaching() creates a new ResolveContext but does not copy rawSpecifier or attributes.

pnpm install

# Terminal 1
pnpm start

# Terminal 2
pnpm workerd

# Terminal 3
curl http://localhost:8080/

Expected (per schema):

{
  "type": "import",
  "specifier": "file:///bundle/missing-module.js",
  "rawSpecifier": "./missing-module.js",
  "referrer": "file:///bundle/worker.js",
  "attributes": []
}

Actual (bug):

{
  "type": "import",
  "specifier": "file:///bundle/missing-module.js",
  "referrer": "file:///bundle/worker.js"
}