test(generate): lock in set_mempolicy_home_node classification

Audit of the set_mempolicy_home_node(2) NUMA syscall (task mz) confirmed
it is correctly classified: KindNull (name-only, ior does not capture the
addr/len range), FamilyMemory (matching its siblings set_mempolicy, mbind,
migrate_pages, move_pages and docs/syscall-tracing-plan.md), and an
Unclassified return (0/-1 with no byte count).

Add lock-in tests so the classification cannot silently drift:
- family_test.go asserts FamilyMemory for set_mempolicy_home_node and its
  NUMA siblings, with a note that get_mempolicy is the lone sibling still
  on FamilySecurity (tracked separately, out of scope here).
- retclassify_test.go asserts the exit stays UNCLASSIFIED.

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

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