feat(config): add configurable default shutdown delay for shutdown actions

test/test.ts

@@ -11,7 +11,11 @@ import { type IPauseState, loadPauseSnapshot } from '../ts/pause-state.ts';
 import { shortId } from '../ts/helpers/shortid.ts';
 import { HTTP_SERVER, SNMP, THRESHOLDS, TIMING, UI } from '../ts/constants.ts';
 import { Action, type IActionContext } from '../ts/actions/base-action.ts';
-import { buildUpsActionContext, decideUpsActionExecution } from '../ts/action-orchestration.ts';
+import {
+  applyDefaultShutdownDelay,
+  buildUpsActionContext,
+  decideUpsActionExecution,
+} from '../ts/action-orchestration.ts';
 import {
   buildShutdownErrorRow,
   buildShutdownStatusRow,
@@ -353,6 +357,22 @@ Deno.test('decideUpsActionExecution: returns executable action plan when actions
   });
 });
 
+Deno.test('applyDefaultShutdownDelay: applies only to shutdown actions without explicit delay', () => {
+  const actions = [
+    { type: 'shutdown' as const },
+    { type: 'shutdown' as const, shutdownDelay: 0 },
+    { type: 'shutdown' as const, shutdownDelay: 9 },
+    { type: 'webhook' as const },
+  ];
+
+  assertEquals(applyDefaultShutdownDelay(actions, 7), [
+    { type: 'shutdown', shutdownDelay: 7 },
+    { type: 'shutdown', shutdownDelay: 0 },
+    { type: 'shutdown', shutdownDelay: 9 },
+    { type: 'webhook' },
+  ]);
+});
+
 // -----------------------------------------------------------------------------
 // Shutdown Monitoring Tests
 // -----------------------------------------------------------------------------