New standalone parser for the server's live PropertyInt update targeting
a VISIBLE object (carries guid). Wire layout: u32 opcode + u8 sequence +
u32 guid + u32 property + i32 value (17 bytes total).
The sequence byte is parsed-past but not honored (latest-wins; DR-4).
The companion PrivateUpdatePropertyInt (0x02CD) targets the player's own
object (no guid) and is not parsed here.
Three tests: uiEffectsUpdate (round-trip guid/prop/value), wrongOpcode
(returns null), truncated (returns null on 16-byte input).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
