🔧 ビルドエラー修正完了 - Phase 10.11継続中

主な修正:
- MirInstruction::PluginInvokeのパターンマッチ追加
- ChatGPT5による変更に対応
- 58個の警告（未使用import）は意図的（ビルトインBox削除中）

ビルド成功！Everything is Plugin革命進行中 🚀

🤖 Generated with Claude Code

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

src/backend/dispatch.rs

@@ -68,6 +68,7 @@ pub(super) fn execute_instruction(vm: &mut VM, instruction: &MirInstruction, deb
         // Complex operations
         MirInstruction::Call { dst, func, args, effects: _ } => vm.execute_call(*dst, *func, args),
         MirInstruction::BoxCall { dst, box_val, method, method_id, args, effects: _ , .. } => vm.execute_boxcall(*dst, *box_val, method, *method_id, args),
+        MirInstruction::PluginInvoke { dst, box_val, method, args, effects: _ } => vm.execute_plugin_invoke(*dst, *box_val, method, args),
         MirInstruction::NewBox { dst, box_type, args } => vm.execute_newbox(*dst, box_type, args),
 
         // Array operations