feat(editor): add WHRD (Heroic Loot Scaling) — 108th open format

Novel replacement for the implicit Heroic-mode loot rules
vanilla WoW encoded in dungeon/raid script systems: a
Normal-mode boss drops items from one loot table, the
Heroic-mode version drops the same items at +N item
levels with M× drop chance plus an optional Heroic-only
currency token. Each WHRD entry binds one (mapId,
difficultyId) combination to its scaling rules so the
loot-roll engine can layer the modifiers over the base
WLOT loot table at encounter death.

Six tunable fields per scaling: itemLevelDelta (signed
int16, typically +13 for 5-man Heroic, +13 to +26 for
raid Heroic), bonusQualityChance (basis points 0..10000
for the probability of a +1-quality-tier bonus drop),
dropChanceMultiplier (float, 1.0 = same rate, 1.5 =
+50%), heroicTokenItemId (per-tier currency reward like
Emblem of Frost), bonusEmblemCount (extra emblems on
top of base 1× per boss).

mapId=0 is a wildcard that applies the scaling to ANY
map at the given difficultyId — used by the
ChallengeMode preset to define generic Bronze/Silver/
Gold tier scalings without naming each instance.

Three preset emitters: makeWotLK5manHeroic (5 WotLK
5-man Heroics: Utgarde Keep, Nexus, Azjol-Nerub,
Ahn'kahet, Drak'Tharon — all +13/2× Emblem of Heroism),
makeRaid25Heroic (4 25H raids: Naxx +13, EoE +13,
Ulduar +26, ICC +26 with corresponding Conquest/Triumph/
Frost emblems), makeChallengeMode (3 anachronistic
challenge-mode tiers as a template for custom servers
backporting MoP-era systems).

Validator's most novel checks are bounds-aware:
bonusQualityChance capped at 10000 basis points (above
that would guarantee multiple bonus drops), no negative
itemLevelDelta (Heroic shouldn't be worse than Normal —
warning, not error), no >50 ilvl delta (beyond canonical
range — warning), no zero or excessive dropChance-
Multiplier, AND (mapId, difficultyId) tuple uniqueness
unless mapId=0 wildcard (multiple scalings binding the
same instance+difficulty would make loot-roll lookup
ambiguous).

Format count 107 -> 108. CLI flag count 1175 -> 1180.

tools/editor/cli_list_formats.cpp

@@ -132,6 +132,7 @@ constexpr FormatRow kFormats[] = {
     {"WLDN", ".wldn",  "server",    "TutorialPopup + LevelMilestone msgs","Learning notification catalog (level-up milestones)"},
     {"WCRE", ".wcre",  "creatures", "creature_template resist + immunity","Creature resist + CC-immunity profile catalog"},
     {"WPTT", ".wptt",  "pets",      "PetTalent.dbc + PetTalentTab.dbc",   "Hunter pet talent tree catalog (3 trees, grid+graph)"},
+    {"WHRD", ".whrd",  "raid",      "implicit Heroic-mode loot scaling",  "Heroic loot scaling catalog (per instance+difficulty)"},
 
     // Additional pipeline catalogs without the alternating
     // gen/info/validate CLI surface (loaded by the engine