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

Closes the WACH open-format loop with --export-wach-json /
--import-wach-json, mirroring the JSON pairs added for
every other novel binary format. All 15 binary formats
added since WOL now have full JSON round-trip authoring.

Each achievement round-trips:
  • 11 scalar fields (id, categoryId, name, description,
    icon, titleReward, points, minLevel, faction, flags)
  • criteria array with full per-criterion fields

Three enum-typed fields emit dual int + name forms so a
hand-author can use either:
  • criterion.kind (kill/quest/loot/level/rep/cast/skill/visit/meta)
  • faction        (both/alliance/horde)
  • flags          (hidden/server-first/realm-first/tracking/...)

Verified byte-identical round-trip on the meta preset (4
achievements, 6 criteria including the 3 CompleteAchievement
criteria that wire the meta-achievement to its prerequisites).

Adds 2 flags (546 documented total now).

tools/editor/cli_arg_required.cpp

@@ -61,6 +61,7 @@ const char* const kArgRequired[] = {
     "--export-wspl-json", "--import-wspl-json",
     "--gen-achievements", "--gen-achievements-bandit", "--gen-achievements-meta",
     "--info-wach", "--validate-wach",
+    "--export-wach-json", "--import-wach-json",
     "--gen-weather-temperate", "--gen-weather-arctic",
     "--gen-weather-desert", "--gen-weather-stormy",
     "--gen-zone-atmosphere",