test(generate): lock in madvise BPF handler field wiring

Audit of madvise(2) (int madvise(void *addr, size_t length, int advice))
confirmed the existing classification and BPF wiring are correct: KindMem /
FamilyMemory, addr=args[0], length=args[1], advice (flags-like) at args[2],
length2=0, and the int return captured generically as UNCLASSIFIED. This is
correctly distinct from process_madvise(2) (KindFd, pidfd at args[0]).

Unlike its KindMem siblings (mprotect, mlock2, brk, map_shadow_stack), madvise
lacked a dedicated handler-field lock-in test. Add TestGenerateMemHandlerMadvise
with positive field assertions plus negative guards: advice must come from
args[2] (not args[0]/addr), length2 must stay zero (no second region), and the
exit must return ctx->ret as UNCLASSIFIED.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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