R90-HAT Linux development integration kit

Open web/help.html for installation and checks. Run its commands from
this factory-random90 directory. Install matching kernel headers first.
This kit contains source, not prebuilt modules or a kernel image.
The tested reference is Pi 5 / Raspberry Pi OS kernel 6.18.34+rpt-rpi-2712.
Other kernels need verification. Driver and integration files are
GPL-2.0-only; see linux/COPYING and the source SPDX notices. Font
licenses accompany the fonts. Website text/illustrations: Patrick Tudor.
The kit contains no EEPROM image or command that programs one.

The optional KUnit source is included for completeness. Its known
initialization-error cleanup issue remains open; this does not affect
the production rng90.c module tested on the Pi. Do not assume its
successful test cases cover fixture-initialization failures.

Before running the installer, read the complete help page. In particular,
review an existing DKMS version before replacing it and make the Pi 5
onboard-RTC choice deliberately. Keep existing NTP configuration.

MANIFEST.json identifies the repository base commit, whether tracked
inputs differ from it, and SHA-256 hashes of every included file.
