feat(editor): add WPTT (Pet Talent Tree) — 107th open format

Novel replacement for the PetTalent.dbc + PetTalentTab.dbc
pair that defined the Hunter pet talent system added in
WotLK. Each entry is one talent in one of the three pet
trees (Cunning/utility, Ferocity/DPS, Tenacity/tank),
placed at a (tier, column) grid position with a per-rank
spell ID array, an optional prerequisite-talent edge,
and a legacy loyalty-level requirement carried over
from Vanilla pet happiness mechanics.

Combines three patterns previously seen separately into
one format: variable-length payload (spellIdsByRank[]
mirroring WCMR's members[]), graph edge
(prerequisiteTalentId mirroring WBAB's previousRankId),
and grid placement (tier+column — first format with
explicit 2D layout coordinates the renderer can use to
draw the talent tree UI).

Three preset emitters one per tree: makeFerocity (6
talents tiers 0-3 with prereq chain CobraReflexes ->
SpikedCollar -> SpidersBite plus parallel Serpent ->
Boars -> Rabid), makeCunning (5 talents Dash/Owls/
Recovery/Cornered/Phoenix), makeTenacity (5 talents
Charge/Stamina/Stomp/Taunt/LastStand).

Validator's most novel checks combine grid + graph
constraints unique to talent-tree formats:
- (tree, tier, column) cell uniqueness — two talents in
  the same cell would render on top of each other
- prereq must resolve to an existing talent IN THE SAME
  TREE (cross-tree prereqs are illegal)
- prereq tier must be STRICTLY LESS than this tier
  (talents only depend on earlier tiers, no
  same-tier or backward dependencies)
- spellIdsByRank.size() must EQUAL maxRank exactly
- no zero spell IDs within the rank array
Plus the standard: id+name required, treeKind 0..2,
tier 0..6 (7 tiers), column 0..2 (3 columns), maxRank
1..5, no duplicate talentIds, no self-referencing
prereqs.

Format count 106 -> 107. CLI flag count 1170 -> 1175.

tools/editor/cli_arg_required.cpp

@@ -328,6 +328,8 @@ const char* const kArgRequired[] = {
     "--gen-cre", "--gen-cre-elites", "--gen-cre-immune",
     "--info-wcre", "--validate-wcre",
     "--export-wcre-json", "--import-wcre-json",
+    "--gen-ptt", "--gen-ptt-cunning", "--gen-ptt-tenacity",
+    "--info-wptt", "--validate-wptt",
     "--gen-weather-temperate", "--gen-weather-arctic",
     "--gen-weather-desert", "--gen-weather-stormy",
     "--gen-zone-atmosphere",