feat(editor): add WSEA JSON round-trip authoring workflow

Closes the WSEA open-format loop with --export-wsea-json /
--import-wsea-json, mirroring the JSON pairs added for
every other novel binary format. All 25 binary formats
added since WOL now have full JSON round-trip authoring.

Each event round-trips all 11 scalar fields. Two enum-typed
fields emit dual int + name forms:
  • holidayKind  (combat / collection / racial / anniversary /
                   fishing / cosmetic / world-event)
  • factionGroup (both / alliance / horde)

Verified byte-identical round-trip on the yearly preset
(4 holidays — Hallow's End / Brewfest / Lunar Festival /
Winter's Veil — with full WTKN tokenIdReward cross-refs
preserved through the JSON layer).

Adds 2 flags (623 documented total now).

tools/editor/cli_arg_required.cpp

@@ -91,6 +91,7 @@ const char* const kArgRequired[] = {
     "--export-wtit-json", "--import-wtit-json",
     "--gen-events", "--gen-events-yearly", "--gen-events-weekends",
     "--info-wsea", "--validate-wsea",
+    "--export-wsea-json", "--import-wsea-json",
     "--gen-mounts", "--gen-mounts-racial", "--gen-mounts-flying",
     "--info-wmou", "--validate-wmou",
     "--gen-weather-temperate", "--gen-weather-arctic",