docs: add r8125 build notes and clean-sweep recording step

Fold the r8125 maintainer notes into AGENTS.md rather than a file beside
the package: the post-commit hook tars every file under a package dir into
the SBo submission archive, so notes kept there would ship upstream.

The r8125 section covers what the SlackBuild alone does not explain: the
KERNEL= and PRINT_PACKAGE_NAME=1 overrides, the @KERNEL@ placeholder check,
and the full reason ENABLE_DASH_SUPPORT=n is load-bearing. Upstream's
Makefile defaults DASH on and appends -DENABLE_DASH_SUPPORT via
EXTRA_CFLAGS +=, but the SlackBuild passes EXTRA_CFLAGS on the make command
line, which overrides instead of appending; the define is lost while
r8125_dash.o is still built, and it fails against a struct with members
ifdef'd out. Dropping the flag on a version bump reintroduces the failure.

Also record that Realtek edits a listing's description in place without
re-rolling the tarball, so a changed blurb is not a release. Verified this
session: the 9.018.00 description now reads "kernel up to 7.1" while
Version, UpdateTime and MD5 are all unchanged.

The nvchecker clean-sweep paragraph was already staged in the working tree
from an earlier session and is included here.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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