refactor(editor): extract for-each batch runners into cli_for_each.cpp

Moves the two batch-runner handlers (--for-each-zone,
--for-each-tile) out of main.cpp into a new
cli_for_each.{hpp,cpp} module. Both substitute `{}` with the
iterated path (find -exec convention) and shell-escape every
token before passing to std::system. Exit code is the failure
count, capped at 255 so the shell can still see it.

main.cpp shrinks by 157 lines (2,964 to 2,807).

tools/editor/cli_for_each.hpp

@@ -0,0 +1,22 @@
+#pragma once
+
+namespace wowee {
+namespace editor {
+namespace cli {
+
+// Dispatch the batch-runner handlers — iterate over zones (or
+// tiles within a zone) and execute a shell command for each
+// one, with `{}` substitution like find -exec.
+//   --for-each-zone <projectDir> -- <cmd>
+//   --for-each-tile <zoneDir>    -- <cmd>
+//
+// Useful for batch-validating, rebuilding, or processing every
+// zone / tile without hand-typing the loop. Exit code is the
+// failure count, capped at 255 so the shell can still see it.
+//
+// Returns true if matched; outRc holds the exit code.
+bool handleForEach(int& i, int argc, char** argv, int& outRc);
+
+} // namespace cli
+} // namespace editor
+} // namespace wowee