[45] [C#-LOOT.2/3/4] Loot gating + money mod + StoreLootItem cascade incomplete

[alseif0x]

• LOOT.2: loot open does not replicate Player::isAllowedToLoot (HasPendingBind, LootMethod/round-robin/over-threshold gating).
• LOOT.3: HandleLootMoney omits SPELL_AURA_MOD_MONEY_GAIN and the MoneyLootedFromCreatures criteria; MoneyMod always 0.
• LOOT.4: Player::StoreLootItem misses the C++ cascade (storage/criteria/ApplyItemLootedSpell/guild news/PROC_FLAG_LOOTED).
  C++: Loot/LootMgr.cpp, Loot/Loot.h, Handlers/LootHandler.cpp, Entities/Player/Player.cpp.

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From the C#-vs-C++ reference audit (local docs/audits/csharp-reference-contrast.md). Plan: docs/migration/PORT_PLAN.md (L26) · State: docs/migration/STATE.md.
Done = contrast Rust vs the cited C++; if it matches, re-anchor the comment to C++ file:line; if it differs, fix behavior to C++. Live + capture-clean. 1 issue = 1 PR.

[alseif0x]

Live repro (found during #15 terrain testing, 2026-06-29)

Repro: kill a creature, then right-click the corpse to loot.
Observed: cannot loot the killed creature — no loot window / no usable loot flow.

This is a live confirmation that the death→corpse-lootable→loot flow is incomplete (corpse not flagged lootable on death and/or CMSG_LOOT/StoreLootItem cascade not wired in the live global-tick death path). Lead to verify against C++ Creature::Update/Unit::Kill (sets UNIT_DYNFLAG_LOOTABLE, generates m_loot) and WorldSession::HandleLootOpcode → LootItem.

Blocks in-client testing of any kill/loot/respawn flow. Not related to #15.