Write integration regression test for stored-procedure parameter description in GraphQL schema

Add an integration test that verifies a description configured on a stored-procedure parameter is correctly surfaced as the GraphQL argument description.

The test should start from a runtime config with a description set on a stored-procedure parameter, go through the full production initialization pipeline, and assert that the generated GraphQL argument description matches the configured value. It should also be verified to fail without the fix and pass with it in place.

Start with the existing integration-test patterns and the runtime configuration path for stored-procedure parameters, then trace the full production initialization pipeline to the generated GraphQL schema. Configure a parameter description and assert that the resulting GraphQL argument has the same description; the regression test should fail without the fix and pass with it.

Written by the indexing model from the issue text.