useSchemaByContext and usePrometheus are not compatible

When schema is loaded with useSchemaByContext async function then usePrometheus crashes with:

```
TypeError: schema.getRootType is not a function
at TypeInfo.enter (/app/node_modules/.pnpm/graphql@16.10.0/node_modules/graphql/utilities/TypeInfo.js:162:33)
at Object.enter (/app/node_modules/.pnpm/graphql@16.10.0/node_modules/graphql/utilities/TypeInfo.js:387:16)
at visit (/app/node_modules/.pnpm/graphql@16.10.0/node_modules/graphql/language/visitor.js:197:21)
at extractDeprecatedFields (file:///app/node_modules/.pnpm/@envelop+prometheus@12.1.3_@envelop+core@5.2.3_graphql@16.10.0_prom-client@15.1.3/node_modules/@envelop/prometheus/esm/utils.js:235:5)
at handler (file:///app/node_modules/.pnpm/@envelop+prometheus@12.1.3_@envelop+core@5.2.3_graphql@16.10.0_prom-client@15.1.3/node_modules/@envelop/prometheus/esm/index.js:261:42)
at file:///app/node_modules/.pnpm/@envelop+prometheus@12.1.3_@envelop+core@5.2.3_graphql@16.10.0_prom-client@15.1.3/node_modules/@envelop/prometheus/esm/index.js:304:43
at Array.forEach ()\n at file:///app/node_modules/.pnpm/@envelop+prometheus@12.1.3_@envelop+core@5.2.3_graphql@16.10.0_prom-client@15.1.3/node_modules/@envelop/prometheus/esm/index.js:304:18
at file:///app/node_modules/.pnpm/@envelop+core@5.2.3/node_modules/@envelop/core/esm/orchestrator.js:123:17
at requestListener (file:///app/node_modules/.pnpm/@workspace+un-yoga@file++++source+packages+un-yoga/node_modules/@workspace/un-yoga/build/src/builder.js:55:38)"},"msg":"Error in GraphQL request"}
```

Start by reproducing the crash with useSchemaByContext and usePrometheus, then inspect the @envelop/prometheus stack-trace entry points, especially extractDeprecatedFields and handler. Trace the value passed as schema and identify the compatibility boundary; done means the same setup no longer throws the reported TypeError.

Written by the indexing model from the issue text.