feat: int32-encoder verify probe (sp_encprobe)

Static RE found the int32 network encoder @ RVA 0x3c8e70 (zigzag+varint, the
'default' encoder of the integer field-type bucket; registry table @0x45f360,
slot[6]). Added it to gamedata + an in-process IDetourHook (IntEncoderDetour)
that logs args + *(int*)c/*(int*)d for the first 12 m_iHealth encodes
(fieldInfo+0x40==728) to confirm which arg carries the spoofable value pointer.
Read-only passthrough; 5 register args, no stack args (safe, unlike EncodeField).

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