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_format_table.cpp

@@ -61,6 +61,7 @@ constexpr FormatMagicEntry kFormats[] = {
     {{'W','S','C','H'}, ".wsch",  "spells",    "--info-wsch",      "Spell school / damage type catalog"},
     {{'W','L','F','G'}, ".wlfg",  "social",    "--info-wlfg",      "LFG / Dungeon Finder catalog"},
     {{'W','M','A','C'}, ".wmac",  "ui",        "--info-wmac",      "Macro / slash command catalog"},
+    {{'W','C','H','F'}, ".wchf",  "chars",     "--info-wchf",      "Character hair / face customization catalog"},
     {{'W','F','A','C'}, ".wfac",  "factions",  nullptr,            "Faction catalog"},
     {{'W','L','C','K'}, ".wlck",  "locks",     nullptr,            "Lock catalog"},
     {{'W','S','K','L'}, ".wskl",  "skills",    nullptr,            "Skill catalog"},