feat(editor): add WCEQ JSON round-trip (export/import sidecar)

Closes the JSON round-trip gap on the creature equipment
catalog format shipped last batch (50th open format). All
fields are scalar — no enum widening — so the JSON mapping
is a direct dump. Slot fields default to the canonical
attachment-table values (mainhand=16, offhand=17,
ranged=18) when omitted from a sidecar, so hand-edits don't
need to spell out the slot numbers for typical loadouts.
Verified byte-identical round-trip on all three preset
emitters (starter / bosses / ranged). 762 documented CLI
flags.

tools/editor/cli_help.cpp

@@ -1437,6 +1437,10 @@ void printUsage(const char* argv0) {
     std::printf("                         Print WCEQ entries (id / creatureId / mainhand+offhand+ranged item IDs / equipFlags / visualKitId / name)\n");
     std::printf("  --validate-wceq <wceq-base> [--json]\n");
     std::printf("                         Static checks: id+creatureId>0+unique, dual-wield/shield/2H polearm flag coherence, mutually-exclusive flag combos\n");
+    std::printf("  --export-wceq-json <wceq-base> [out.json]\n");
+    std::printf("                         Export binary .wceq to a human-editable JSON sidecar (defaults to <base>.wceq.json)\n");
+    std::printf("  --import-wceq-json <json-path> [out-base]\n");
+    std::printf("                         Import a .wceq.json sidecar back into binary .wceq (slot fields default to canonical 16/17/18 if omitted)\n");
     std::printf("  --gen-weather-temperate <wow-base> [zoneName]\n");
     std::printf("                         Emit .wow weather schedule: clear-dominant + occasional rain + fog (forest / grassland)\n");
     std::printf("  --gen-weather-arctic <wow-base> [zoneName]\n");