chore: movementモジュールをeditor.zigにインポート

将来の拡張用にコマンドモジュールのインポートを整備。

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: sanohiro

src/editor.zig

@@ -61,6 +61,7 @@ const EditingContext = @import("editing_context").EditingContext;
 const Keymap = @import("keymap").Keymap;
 const MacroService = @import("macro_service").MacroService;
 const edit = @import("commands_edit");
+const movement = @import("commands_movement");
 const rectangle = @import("commands_rectangle");
 const mx = @import("commands_mx");