The kernel, systemd, and many other things print their version during boot. sd-boot and sd-stub are also important, so let's print the version if EFI_DEBUG. (If !EFI_DEBUG, continue to be quiet.) When updating the docs, I saw that that the text in HACKING.md was out of date. Instead of trying to update the instructions there, make it shorter and refer the reader to tools/debug-sd-boot.sh for details.
System and Service Manager
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