Add disabled failure sample job for testing desktop notifications.

Seed Failure notification test in defaultJobs so new installs can verify
Settings notifications via Run now without scheduler spam.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/CHANGELOG.md

@@ -4,6 +4,12 @@ All notable GoSentry changes are recorded in this file.
 
 ## 1.0.1 - 2026-08-04
 
+**Sample jobs include a disabled failure test for desktop notifications.**
+
+- **`storage.defaultJobs`** — new disabled example *Failure notification test*
+  (folder Examples). Run it manually to trigger a failed run and verify
+  Settings → Notifications without waiting on the scheduler.
+
 **Platform layer rationale is documented in ARCHITECTURE.md.**
 
 - **`docs/ARCHITECTURE.md`** — new §Platform layer: why autostart, file manager,