feat(pipeline): WPHM player movement-to-animation map (127th open format)

Novel replacement for the implicit movementState->animation
binding that vanilla WoW baked into per-race M2 model files.
Each WPHM entry binds one (raceId, genderId, movementState)
tuple to a base M2 animation sequence id, an optional variant
sequence (drunk-walk, wounded-run), and a blend transition
duration in milliseconds.

8-state machine: Idle / Walk / Run / Swim / Fly / Sit / Mount /
Death. Three presets each emit the full 16 bindings (M+F):
  --gen-phm-human   16 bindings with drunk-walk variant on Walk
  --gen-phm-orc     16 bindings with AttackRun variant on Run
                    for war-stance flavor
  --gen-phm-undead  16 bindings with canonical shambling variant
                    (anim 38) on Run for low-health renderer
                    override + slower swim transition (undead are
                    awkward in water)

Validator catches: id required, raceId 1..10, genderId 0..1,
movementState 0..7, no duplicate mapIds, no duplicate
(race,gender,state) triples (renderer dispatch ambiguity),
baseAnimId=0 forbidden on non-Idle states (model would freeze
when entering that state). Warns on variantAnimId==baseAnimId
(no-op overhead) and transitionMs > 2000 (would feel like
animation hang).

Format count 126 -> 127. CLI flag count 1337 -> 1344.

tools/editor/cli_arg_required.cpp

@@ -389,6 +389,8 @@ const char* const kArgRequired[] = {
     "--gen-spk-warrior", "--gen-spk-mage", "--gen-spk-rogue",
     "--info-wspk", "--validate-wspk",
     "--export-wspk-json", "--import-wspk-json",
+    "--gen-phm-human", "--gen-phm-orc", "--gen-phm-undead",
+    "--info-wphm", "--validate-wphm",
     "--gen-weather-temperate", "--gen-weather-arctic",
     "--gen-weather-desert", "--gen-weather-stormy",
     "--gen-zone-atmosphere",