feat(n8n-webhook): add calendar list update delete approval flows

skills/n8n-webhook/scripts/validate-workflow.py

@@ -31,6 +31,9 @@ SAMPLE_FILES = [
     'test-send-gmail-draft.json',
     'test-send-approved-email.json',
     'test-create-calendar-event.json',
+    'test-list-upcoming-events.json',
+    'test-update-calendar-event.json',
+    'test-delete-calendar-event.json',
     'test-fetch-and-normalize-url.json',
     'test-approval-queue-list.json',
     'test-inbound-event-filter.json',
@@ -47,6 +50,9 @@ ROUTER_SNIPPETS = [
     'send_gmail_draft',
     'send_approved_email',
     'create_calendar_event',
+    'list_upcoming_events',
+    'update_calendar_event',
+    'delete_calendar_event',
     'approval_queue_add',
     'approval_queue_list',
     'approval_queue_resolve',
@@ -61,6 +67,9 @@ ROUTER_SNIPPETS = [
     'email_draft_send',
     'email_draft_delete',
     'email_list_drafts',
+    'calendar_list_events',
+    'calendar_event_update',
+    'calendar_event_delete',
     'makeApprovalPolicy',
     'inboundEvents',
     'eventDedup',