refactor(editor): extract --info-{zone,project}-water into cli_info_water.cpp

Moves the two water-layer audit handlers (--info-zone-water,
--info-project-water) out of main.cpp into a new
cli_info_water.{hpp,cpp} module. Both aggregate liquid data
(water/ocean/magma/slime) across MH2O chunks; the project
variant rolls per-zone counts into a project-wide total with
height range and per-type histogram.

main.cpp shrinks by 209 lines (7,463 to 7,254). Both --json
output modes preserved for capacity-planning pipelines.

tools/editor/cli_info_water.hpp

@@ -0,0 +1,22 @@
+#pragma once
+
+namespace wowee {
+namespace editor {
+namespace cli {
+
+// Dispatch the water-layer audit handlers — aggregate liquid
+// data (water/ocean/magma/slime) across a zone or project.
+// Useful for confirming a 'lake zone' actually carries water,
+// or for budget planning when many zones share liquid types.
+//   --info-zone-water     drill into one zone's MH2O layers
+//   --info-project-water  project-wide rollup with per-zone rows
+//
+// Both support an optional trailing `--json` flag for
+// machine-readable reports.
+//
+// Returns true if matched; outRc holds the exit code.
+bool handleInfoWater(int& i, int argc, char** argv, int& outRc);
+
+} // namespace cli
+} // namespace editor
+} // namespace wowee