test(process_madvise): lock in KindFd + UNCLASSIFIED + FamilyMemory

Audit of process_madvise(2) confirmed the existing classification is correct
and added lock-in coverage:

- KindFd with fd=args[0]: the first arg is a pidfd (a PID file descriptor
  selecting the target process), not an address, so it must NOT be treated
  like madvise(2) (KindMem, addr=args[0]). Extended the enter-handler test
  with a negative assertion guarding against the KindMem addr wiring.
- Exit ret_type=UNCLASSIFIED: process_madvise returns the number of bytes
  advised, but that is advisory accounting, not real I/O data movement, so it
  stays UNCLASSIFIED like madvise(2). Added an exit-handler assertion plus
  TestClassifyRetProcessMadviseUnclassified.
- FamilyMemory: shares the family with madvise/process_mrelease/process_vm_*
  siblings rather than FamilyIPC (pidfd_* lifecycle). Added family lock-in
  cases in family_test.go.

No classification/codegen changes were required; mage generate produces no
diff. Full ./internal/... passes.

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

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