refactor(editor): extract random-* / gen-random-* into cli_random.cpp

Moves the four random-population handlers (--random-populate-zone,
--random-populate-items, --gen-random-zone, --gen-random-project)
out of main.cpp into a new cli_random.{hpp,cpp} module. All four
use the same seeded LCG so re-runs reproduce the same content;
the gen-random-* pair shells out to scaffold-zone +
random-populate-zone + random-populate-items so the simpler
single-purpose handlers stay the source of truth.

main.cpp shrinks by 439 lines (5,788 to 5,349). The inline word
lexicons (creature names, object paths, item prefixes/nouns) move
with random-populate-zone and -items into the new module.

tools/editor/cli_random.hpp

@@ -0,0 +1,21 @@
+#pragma once
+
+namespace wowee {
+namespace editor {
+namespace cli {
+
+// Dispatch the random-* / gen-random-* zone-population handlers.
+// All four use a seeded LCG so re-runs reproduce the same
+// content; they're intended for playtest scenarios where you
+// want bulk-populated zones without hand-typing every spawn.
+//   --random-populate-zone   add N creatures + M objects to a zone
+//   --random-populate-items  add N item records to items.json
+//   --gen-random-zone        scaffold + populate + items in one shot
+//   --gen-random-project     spawn N gen-random-zones in a raster
+//
+// Returns true if matched; outRc holds the exit code.
+bool handleRandom(int& i, int argc, char** argv, int& outRc);
+
+} // namespace cli
+} // namespace editor
+} // namespace wowee