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41c12e32ce
Add a new integration test to verify the signal handler validation for Type=notify-reload services, as introduced in the previous commit. The test adds a shell harness and four service files to cover all scenarios: 1. `notify-reload-no-handler.service`: Verifies that the service fails to start with Result=protocol when the handler is missing at the first READY=1. 2. `notify-reload-sigstop.service`: Verifies that SIGSTOP is exempt from handler validation because it cannot be caught or blocked. 3. `notify-reload-toggle-handler.service`: Verifies that removing the handler at runtime results in a warning on reload, but the signal is still sent, causing the service to terminate from unhandled SIGHUP. 4. `notify-reload-well-behaved.service`: Verifies the happy path where a service with a handler starts and reloads successfully. Use bounded FIFO operations and journal cursors so failures are prompt and log assertions cannot race a relative time window.