Add mod list troubleshooter skeleton

lib/mod_list_troubleshooter.dart

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+import 'dart:async';
+
+import 'package:rimworld_modman/logger.dart';
+import 'package:rimworld_modman/mod.dart';
+import 'package:rimworld_modman/mod_list.dart';
+
+/// A class that helps find the minimum set of mods that exhibit a bug.
+///
+/// Provides two main algorithms:
+/// - Binary search / bisect: Divides mods into smaller subsets to find problematic ones quickly.
+/// - Linear search / batching: Tests mods in small groups to systematically identify issues.
+///
+/// These approaches help RimWorld mod users identify which mods are causing problems
+/// when many mods are installed.
+class ModListTroubleshooter {
+  final ModList originalModList;
+  ModList currentModList;
+
+  ModListTroubleshooter(ModList modList)
+    : originalModList = modList,
+      currentModList = modList.copyWith();
+
+  ModList binaryForward() {
+    return currentModList;
+  }
+
+  ModList binaryBackward() {
+    return currentModList;
+  }
+
+  ModList linearForward() {
+    return currentModList;
+  }
+
+  ModList linearBackward() {
+    return currentModList;
+  }
+
+  void reset() {
+    currentModList = originalModList.copyWith();
+  }
+}