feat(pipeline): add WCEQ (Wowee Creature Equipment) — 50th open format

Replaces the AzerothCore-style creature_equip_template SQL
tables plus the visible-weapon / shield / ranged-slot data
that was traditionally embedded in creature templates. Closes
a long-standing gap in the creature subsystem: until now WCRT
defined a creature's stats, WSPN placed it in the world, and
WLOT defined what it drops — but nothing defined what items
it visibly equips.

Each entry binds a creatureId to up to three equipped items
(main hand / off hand / ranged) plus the visual kit that
fires when the main-hand weapon is brandished. equipFlags
bits encode hidden / dual-wield / shield-offhand /
thrown-ranged / 2H polearm to drive the renderer's
attachment-point selection.

Cross-references with prior formats — creatureId points at
WCRT.creatureId, mainHandItemId / offHandItemId / rangedItemId
all point at WIT.itemId, and mainHandVisualId points at
WSVK.visualKitId so brandished weapons can play their
signature glow / aura.

CLI: --gen-ceq (3 generic guard/hunter/rogue starters),
--gen-ceq-bosses (4 iconic loadouts incl. Frostmourne and
Illidan's warglaives, with WSVK visual cross-refs),
--gen-ceq-ranged (3 ranged-only rifle/bow/crossbow loadouts),
--info-wceq, --validate-wceq with --json variants. Validator
catches id=0/duplicates, missing creatureId, all-empty-slots
warning, kFlagDualWield without both hand items, kFlagShield
without offhand item, mutually-exclusive dual-wield + shield,
and 2H polearm with offhand item filled.

Format graph milestone: 50 distinct binary formats. CLI flag
count: 754 → 760.

tools/editor/cli_arg_required.cpp

@@ -151,6 +151,8 @@ const char* const kArgRequired[] = {
     "--gen-tsk", "--gen-tsk-blacksmithing", "--gen-tsk-alchemy",
     "--info-wtsk", "--validate-wtsk",
     "--export-wtsk-json", "--import-wtsk-json",
+    "--gen-ceq", "--gen-ceq-bosses", "--gen-ceq-ranged",
+    "--info-wceq", "--validate-wceq",
     "--gen-weather-temperate", "--gen-weather-arctic",
     "--gen-weather-desert", "--gen-weather-stormy",
     "--gen-zone-atmosphere",