feat(editor): add WSKP (Sky Parameters) — 119th open format

Novel replacement for the LightParams.dbc + Light.dbc
pair vanilla WoW used to drive the per-zone diurnal sky
cycle. Each entry binds one (mapId, areaId,
timeOfDayHour) triplet to its sky-rendering parameters:
sky-dome zenith and horizon colors, sun angle and color,
fog start/end distances, cloud-layer opacity, and cloud
drift speed in tenths-mph.

The renderer interpolates between adjacent keyframes
when the in-game clock crosses an hour boundary, so a
4-keyframe set (Dawn/Noon/Dusk/Midnight) produces the
full diurnal cycle through linear interpolation. Servers
can author finer-grained keyframes (e.g. every 3 hours)
for smoother transitions.

Three preset emitters demonstrating the catalog's range:
makeStormwindDay (4 standard temperate keyframes from
lavender dawn through bright noon to deep blue-black
midnight), makeNorthrendArctic (4 cold steel-blue
keyframes with high-density ice fog peaking at the
midnight blizzard whiteout — minimum 30yd visibility),
makeOutlandHellfire (3 keyframes — no midnight, since
Outland's permanent gravitational anomaly from the
Twisting Nether keeps the sky lit; iconic crimson +
orange palette throughout).

Validator's most novel checks: per-(mapId, areaId,
timeOfDayHour) triple uniqueness — two keyframes at the
same hour for the same area would render in unstable
order during diurnal interpolation. Plus
fogStartYards >= fogEndYards (inverted falloff) error,
sunAngleDeg outside [0,360] warning (renderer wraps
modulo but suggests authoring confusion).

Format count 118 -> 119. CLI flag count 1255 -> 1260.

tools/editor/cli_list_formats.cpp

@@ -143,6 +143,7 @@ constexpr FormatRow kFormats[] = {
     {"WWFL", ".wwfl",  "social",    "chat preprocessor bad-word matcher", "Word filter catalog (spam/RMT/all-caps/URL)"},
     {"WMAR", ".wmar",  "ui",        "raid-target icon set (8 fixed)",     "Raid marker catalog (8 raid + map pins + party roles)"},
     {"WLMA", ".wlma",  "loot",      "GroupLoot CMSG_LOOT_METHOD policy",  "Loot mode policy catalog (FFA / RR / Master / NBG / Personal)"},
+    {"WSKP", ".wskp",  "world",     "LightParams.dbc + Light.dbc diurnal","Sky parameters catalog (per-zone keyframes)"},
 
     // Additional pipeline catalogs without the alternating
     // gen/info/validate CLI surface (loaded by the engine