feat(pipeline): add WCHF (Wowee Character Customization Feature) catalog

59th open format — replaces CharHairGeosets.dbc +
CharFacialHairStyles.dbc plus the variation portions of
CharSections.dbc. Defines per-(race, sex) customization
options the character creation screen exposes: skin colors,
face variations, hair styles, hair colors, facial hair
(beards / mustaches), and race-specific markings (Tauren
horns, Draenei tendrils, Blood Elf ears).

9 feature kinds (SkinColor / FaceVariation / HairStyle /
HairColor / FacialHair / FacialColor / EarStyle / Horns /
Markings) cover the full canonical customization surface.
Each entry is one selectable carousel choice for one
(race, sex, kind) tuple — variationIndex disambiguates.
expansionGate enum gates Blood Elf / Draenei (TBC) and DK
features (WotLK) behind the right expansion unlock.

Cross-references with prior formats — raceId points at
WCHC.race.raceId. requiresExpansion bit positions match
the WLFG expansion enum (Classic=0, TBC=1, WotLK=2,
Turtle=3) for consistency.

CLI: --gen-chf (5 Human Male starter — skin / face / 2
hair styles / facial hair), --gen-chf-bloodelf (8 Blood
Elf Female hair styles, requiresExpansion=TBC — the
iconic TBC race feature), --gen-chf-tauren (6 Tauren Male
features using race-specific Horns kind + 3 facial hair
variations), --info-wchf, --validate-wchf with --json
variants. Validator catches id+name+raceId+texturePath
required, kind 0..8 / sex 0..1 / expansion 0..3, and the
critical (race, sex, kind, variation) tuple-uniqueness
check — duplicates would shadow each other in the create-
character carousel.

Format graph: 58 → 59 binary formats. CLI flag count: 819
→ 826.

tools/editor/cli_arg_required.cpp

@@ -179,6 +179,8 @@ const char* const kArgRequired[] = {
     "--gen-mac", "--gen-mac-combat", "--gen-mac-utility",
     "--info-wmac", "--validate-wmac",
     "--export-wmac-json", "--import-wmac-json",
+    "--gen-chf", "--gen-chf-bloodelf", "--gen-chf-tauren",
+    "--info-wchf", "--validate-wchf",
     "--gen-weather-temperate", "--gen-weather-arctic",
     "--gen-weather-desert", "--gen-weather-stormy",
     "--gen-zone-atmosphere",