AUDIT-059 round 15 — diagnostic. When `--audit-r3-dump-bytes=N` is set,
every `--audit-pc-probe-hex` fire emits a paired `AUDIT-R3-DUMP` line
with N bytes of guest memory from r3 as u32 lanes (4-byte aligned, cap
256B). Sized for the 80-byte stack-local struct at sub_82452DC0's
`r31+96` (probe sub_8245B000 entry where r3 IS the struct ptr).
Settable via `XENIA_AUDIT_R3_DUMP_BYTES` env. Read-only; lockstep digest
unaffected (empty-set fast path in fire_audit_pc_probe_if_match).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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