refactor(editor): extract WCP pack handlers into cli_pack.cpp

Moves the six WoWee Content Pack (.wcp) handlers out of
main.cpp:
  --list-wcp           --info-wcp
  --info-pack-budget   --info-pack-tree
  --pack-wcp           --unpack-wcp

All six defer to wowee::editor::ContentPacker for actual pack
I/O; the handlers just parse args and format output, so the
extraction has no behavioral impact on the pack format itself.

main.cpp drops 17,766 → 17,505 lines (-261). Behavior verified
by re-running --info-wcp on a missing file (same error message).

tools/editor/cli_pack.hpp

@@ -0,0 +1,20 @@
+#pragma once
+
+namespace wowee {
+namespace editor {
+namespace cli {
+
+// Dispatch the WoWee Content Pack (.wcp) handlers:
+//   --list-wcp           --info-wcp
+//   --info-pack-budget   --info-pack-tree
+//   --pack-wcp           --unpack-wcp
+//
+// All defer to wowee::editor::ContentPacker for actual pack
+// I/O; the handlers just parse args and format output.
+//
+// Returns true if matched; outRc holds the exit code.
+bool handlePack(int& i, int argc, char** argv, int& outRc);
+
+} // namespace cli
+} // namespace editor
+} // namespace wowee