Add complete system qualification evidence

crates/remora-credentials/tests/qualification_cleanup.rs

@@ -0,0 +1,18 @@
+use sqlx::postgres::PgPoolOptions;
+
+#[tokio::test]
+async fn remove_standalone_credential_fixture_rows() {
+    if std::env::var("REMORA_QUALIFICATION_REQUIRE").is_err() {
+        return;
+    }
+    let database_url = std::env::var("DATABASE_URL").expect("DATABASE_URL");
+    let pool = PgPoolOptions::new()
+        .max_connections(1)
+        .connect(&database_url)
+        .await
+        .expect("connect postgres");
+    sqlx::query("TRUNCATE execution_grant_credential_pins, source_credentials CASCADE")
+        .execute(&pool)
+        .await
+        .expect("clear standalone credential fixtures");
+}