test(sched_getparam): lock in KindNull/FamilySched/UNCLASSIFIED classification

Audit of sched_getparam(2): int sched_getparam(pid_t pid, struct
sched_param *param). args[0] is a PID (not an fd) and param is a
userspace output pointer, so the enter tracepoint classifies as
KindNull and the family is Sched; the exit returns int 0/-1 (a status
code, not a byte count) and stays KindRet/UNCLASSIFIED.

Classification in classify.go, family.go, and docs/syscall-tracing-plan.md
already match the man page and the sched_* siblings; mage generate
produces no diff. This adds a dedicated lock-in regression test mirroring
the prior sched_getattr audit, pinning the pid-not-fd invariant, the
family, the exit classification, and sibling consistency with
sched_setparam.

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

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