Fix missing item ID generators in retained instruction tests (#59403)

Pass `uuid_v7_item_id_generator_for_test()` to the two remaining
`record_user_message` calls in the transcript source-proof and budgeting test
to match the required API signature.

GitOrigin-RevId: d9ea7da605de895e009a67a3ab378111599b5bbd

codex-rs/guardian-context/src/retained_instructions_tests.rs

@@ -674,6 +674,7 @@ fn transcript_original_requires_complete_source_proof_and_survives_budgeting() {
         .record_user_message(
             grant.clone(),
             RetainedInputSource::Local(Some(EARLIER_SOURCE_ORDER)),
+            &uuid_v7_item_id_generator_for_test(),
         )
         .unwrap();
     let mut item =
@@ -707,6 +708,7 @@ fn transcript_original_requires_complete_source_proof_and_survives_budgeting() {
         .record_user_message(
             newer.clone(),
             RetainedInputSource::Local(Some(NEWEST_SOURCE_ORDER)),
+            &uuid_v7_item_id_generator_for_test(),
         )
         .unwrap();
     let newest_id = source.id.clone();