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Add a user_defined.check function pointer to struct skip_image, allowing platforms to implement custom skip image detection logic. When set and returning non-zero, BLE signals the bootloader to load the recovery image. This enables boards without dedicated recovery GPIOs to implement software-based recovery triggers (e.g., UART key press detection). Original-concept-by: Nicolas Schichan <nschichan@freebox.fr> Change-Id: Ib58033fb1440f701dab027d77505f2582e3d98da Signed-off-by: Vincent Jardin <vjardin@free.fr>