test(sql-orm-client): align user_tags DDL with the contract (note, created_at)

The shared fixture's junction declares a nullable note and a defaulted
created_at (exclusion-path coverage for requiredPayloadColumns); create
the columns so the schema matches the contract.

Signed-off-by: Alexey Orlenko's AI Agent <robot@aqrln.net>

Author: tensordreams

test/integration/test/sql-orm-client/runtime-helpers.ts

@@ -230,6 +230,8 @@ export async function setupTestSchema(runtime: PgIntegrationRuntime): Promise<vo
     create table user_tags (
       user_id integer not null,
       tag_id text not null,
+      note text,
+      created_at text not null default now(),
       primary key (user_id, tag_id)
     )
   `);