feat(task-018): add observability retry cancel and audit trail

apps/frontend/tests/admin_script_versions.model.test.mjs

@@ -20,6 +20,7 @@ new Function("exports", compiled.outputText)(moduleExports);
 
 const {
   buildAdminScriptVersionRows,
+  buildAdminScriptAuditRows,
   defaultScriptVersionDraft,
   buildCreateScriptVersionPayload,
   parseJsonObject,
@@ -53,3 +54,21 @@ assert.equal(payload.rollback_target_version_id, null);
 assert.deepEqual(parseJsonObject('{"a":1}'), { a: 1 });
 assert.equal(parseJsonObject("[]"), null);
 assert.deepEqual(parseJsonObject(""), {});
+
+const auditRows = buildAdminScriptAuditRows([
+  {
+    id: "evt-1",
+    target_site_id: "site-1",
+    version_id: "ver-1",
+    event_type: "SCRIPT_CONFIG_VERSION_ROLLBACK",
+    actor_user_id: "user-1",
+    payload: { action: "rollback" },
+    created_at: "2026-05-21T12:00:00Z",
+    version: 2,
+    diff: { summary: "rollback event" },
+    rollback_target_version_id: "ver-0",
+  },
+]);
+assert.equal(auditRows.length, 1);
+assert.equal(auditRows[0].eventType, "SCRIPT_CONFIG_VERSION_ROLLBACK");
+assert.equal(auditRows[0].rollbackTargetVersionId, "ver-0");