feat: add runtime i18n API with manifest translations

- Add RuntimeOptions.basePackages for loading framework packages before game package
- Add ScriptEngine.loadPackages() for multi-package module merging
- LuaDardoScriptEngine merges modules from all packages, game overrides framework
- PackageActivationController loads base packages first, then game package
- GamePackageManifest parses optional 'base' field
- Update docs: README, quick-start, lua-package-format, architecture
- Update all test mocks with loadPackages() implementation

AGENTS.md

@@ -133,6 +133,8 @@ A warning about missing `homepage` / `repository` is acceptable until real publi
 ## Development rules
 
 - Keep protocol fields white-listed and explicit.
+- Write code that ordinary maintainers can safely modify: keep control flow obvious, names explicit, abstractions shallow, and avoid clever or hidden behavior.
+- Remove deprecated, unused, or superseded code promptly when replacing behavior; do not leave parallel old paths unless a documented compatibility window requires them.
 - Prefer simple data models over implicit behavior.
 - Runtime commands must be generic, not game-specific.
 - Lua helper aliases are allowed only if normalized before protocol validation.

README.md

@@ -19,6 +19,9 @@ It is designed for Flutter apps that want to host Lua-authored 2D games or inter
 - Runtime commands for movement, fading, scaling, rotation, sequencing, audio, resources, toast, clipboard, and Spine animation.
 - Shared Lua helper modules under `assets/runtime/lua/`.
 - Configurable Runtime Lua asset root via `RuntimeOptions.runtimeLuaRoot`.
+- Multi-package loading: shared framework packages loaded once, game packages loaded on top.
+- Asset, local file, and remote package repositories for bundled, development, and hot-update workflows.
+- Remote package compatibility checks for Runtime version, host build, platform, and release channel.
 
 ## Example
 
@@ -59,6 +62,18 @@ LuaGameWidget(
 )
 ```
 
+With a shared framework package:
+
+```dart
+LuaGameWidget(
+  gameId: 'ludo',
+  runtimeOptions: const RuntimeOptions(
+    runtimeLuaRoot: 'packages/flame_lua_runtime/assets/runtime/lua',
+    basePackages: ['_framework'],
+  ),
+)
+```
+
 Your app should provide game package assets such as:
 
 ```text
@@ -82,6 +97,14 @@ The game manifest declares package-local scripts and shared Runtime Lua modules:
 }
 ```
 
+## Package loading modes
+
+- `AssetGamePackageRepository`: bundled app assets and fallback packages.
+- `FileGamePackageRepository`: local development directory, useful when large images should not be bundled into the app during iteration.
+- `RemoteGamePackageRepository`: remote zip packages with sha256 verification, compatibility checks, and stable cache fallback.
+
+Remote compatibility is configured with `RuntimeOptions.runtimeVersion`, `hostBuild`, `platform`, and `channel`.
+
 ## Runtime asset path
 
 When used as a published package, configure:
@@ -105,7 +128,7 @@ For AI agents and maintainers, start with:
 - [`AGENTS.md`](AGENTS.md) — package boundaries, rules, public API, and validation commands.
 - [`docs/quick-start.md`](docs/quick-start.md) — host app integration.
 - [`docs/architecture.md`](docs/architecture.md) — Dart/Lua/Flame responsibilities.
-- [`docs/lua-package-format.md`](docs/lua-package-format.md) — manifest and Lua package rules.
+- [`docs/lua-package-format.md`](docs/lua-package-format.md) — manifest, Lua package rules, and multi-package loading.
 - [`docs/protocol.md`](docs/protocol.md) — RuntimeEvent, GameDiff, RuntimeNode, RuntimeCommand boundary.
 - [`docs/validation.md`](docs/validation.md) — checks, smoke tests, and release flow.
 

docs/architecture.md

@@ -68,6 +68,28 @@ Package dependency root:
 packages/flame_lua_runtime/assets/runtime/lua
 ```
 
+### Multi-package loading
+
+The runtime supports loading multiple packages in sequence, with module merging:
+
+```text
+RuntimeOptions.basePackages = ['_framework']
+  -> load _framework package (modules: app, diff, ids, net, ...)
+  -> load game package (modules: state, rules, main, ...)
+  -> merge into flat _moduleScripts map
+  -> game modules override framework modules on name collision
+  -> execute game entry script
+```
+
+Key classes:
+
+- `RuntimeOptions.basePackages` — ordered list of framework package IDs.
+- `PackageActivationController._prepareCandidate()` — loads base packages first, then game package, passes combined list to `ScriptEngine.loadPackages()`.
+- `LuaDardoScriptEngine.loadPackages()` — iterates all packages, merges `manifest.modules` into `_moduleScripts`, executes entry from last package.
+- `GamePackageManifest.base` — optional metadata field declaring framework dependency.
+
+Module resolution is flat: `runtime.import("xxx")` looks up `_moduleScripts[xxx]`. Game modules and framework modules share the same namespace. Later-loaded packages win on collision.
+
 ## Safety model
 
 - Lua module loading is manifest-declared.

docs/lua-package-format.md

@@ -64,6 +64,53 @@ runtime:*.lua
 
 `runtime:` paths must not contain `/`, `..`, or an empty filename.
 
+## Base packages
+
+A game manifest can declare a `base` field to indicate it depends on a framework package:
+
+```json
+{
+  "gameId": "ludo",
+  "base": "_framework",
+  "modules": { ... }
+}
+```
+
+The `base` field is metadata. Actual loading is controlled by `RuntimeOptions.basePackages`:
+
+```dart
+LuaGameWidget(
+  gameId: 'ludo',
+  runtimeOptions: const RuntimeOptions(
+    basePackages: ['_framework'],
+  ),
+)
+```
+
+Loading order:
+
+1. Base packages are loaded first, in `basePackages` order.
+2. The game package is loaded last.
+3. All modules are merged into a flat map.
+4. Later packages override earlier packages on name collision.
+5. The entry script always comes from the last (game) package.
+
+This means a game can override any framework module by declaring a module with the same name in its own manifest.
+
+## Multi-package module resolution
+
+When Lua code calls `runtime.import("xxx")`:
+
+1. Look up `xxx` in the merged module map (game modules first, then framework).
+2. If not found, throw `FormatException: Lua module is not declared in manifest.modules`.
+
+Framework modules are transparent to game code:
+
+```lua
+local app = runtime.import("app")       -- resolved from framework
+local state = runtime.import("state")   -- resolved from game
+```
+
 ## Entry module
 
 The manifest `entry` module should expose lifecycle/event functions expected by the script engine. Keep game-specific state in Lua modules and return runtime diffs/commands through the approved protocol.
@@ -95,6 +142,80 @@ Check without rewriting:
 dart run tool/generate_lua_runtime_defs.dart --check
 ```
 
+## Package sources
+
+Host apps can load packages from three common sources:
+
+```dart
+// Bundled app assets.
+AssetGamePackageRepository(runtimeOptions: runtimeOptions)
+
+// Local development directory, useful when images should not be bundled into app assets.
+FileGamePackageRepository(
+  baseDirectory: 'E:/lua_packages',
+  runtimeOptions: runtimeOptions,
+)
+
+// Remote update server.
+RemoteGamePackageRepository(
+  baseUri: Uri.parse('https://example.com/lua-packages/'),
+  runtimeOptions: runtimeOptions,
+)
+```
+
+A local development directory uses the same package layout as a downloaded remote zip:
+
+```text
+E:/lua_packages/gomoku/
+  manifest.json
+  scripts/
+  assets/
+```
+
+## Remote compatibility
+
+Remote manifests may include a `compat` block. The server should use request query values to return the newest compatible package, and the client validates the returned manifest again before download.
+
+```json
+{
+  "gameId": "gomoku",
+  "version": "0.3.0",
+  "packageUrl": "https://example.com/packages/gomoku-0.3.0.zip",
+  "sha256": "...",
+  "compat": {
+    "runtimeApiVersion": 1,
+    "minRuntimeVersion": "0.4.0",
+    "maxRuntimeVersion": "0.4.9",
+    "minHostBuild": 120,
+    "platforms": ["windows", "android"],
+    "channels": ["dev", "prod"]
+  }
+}
+```
+
+`RemoteGamePackageRepository` sends these query parameters when fetching `remote_manifest.json`:
+
+```text
+runtimeApiVersion
+runtimeVersion
+hostBuild
+platform
+channel
+```
+
+Configure them through `RuntimeOptions`:
+
+```dart
+RuntimeOptions(
+  runtimeVersion: '0.4.0',
+  hostBuild: 120,
+  platform: 'windows',
+  channel: 'dev',
+)
+```
+
+If compatibility fails, the remote package is not downloaded. The repository falls back to stable cache, previous stable cache, then bundled assets.
+
 ## Package validation
 
 A host repository can validate a game package with:

docs/quick-start.md

@@ -98,3 +98,77 @@ flutter run --dart-define=LUA_GAME_ID=flight
   }
 }
 ```
+
+## Multi-package loading (base + game)
+
+When multiple games share common modules (event router, diff utilities, panel stack, network layer), extract them into a framework package and load it before the game package.
+
+Framework package structure:
+
+```text
+assets/games/_framework/
+  manifest.json
+  scripts/
+    app.lua
+    diff.lua
+    event_router.lua
+    ids.lua
+    net.lua
+    panel_stack.lua
+```
+
+Framework manifest:
+
+```json
+{
+  "gameId": "_framework",
+  "name": "Lua Game Framework",
+  "version": "1.0.0",
+  "runtimeApiVersion": 1,
+  "entry": "scripts/app.lua",
+  "assetsBase": "assets",
+  "modules": {
+    "app": "scripts/app.lua",
+    "diff": "scripts/diff.lua",
+    "event_router": "scripts/event_router.lua",
+    "ids": "scripts/ids.lua",
+    "net": "scripts/net.lua",
+    "panel_stack": "scripts/panel_stack.lua"
+  }
+}
+```
+
+Game manifest (no framework modules needed):
+
+```json
+{
+  "gameId": "ludo",
+  "base": "_framework",
+  "modules": {
+    "state": "scripts/state.lua",
+    "rules": "scripts/rules.lua",
+    "main": "scripts/main.lua"
+  }
+}
+```
+
+Game code imports framework modules transparently:
+
+```lua
+local app = runtime.import("app")       -- from framework
+local state = runtime.import("state")   -- from game
+```
+
+Embed with base packages:
+
+```dart
+LuaGameWidget(
+  gameId: 'ludo',
+  runtimeOptions: const RuntimeOptions(
+    runtimeLuaRoot: 'packages/flame_lua_runtime/assets/runtime/lua',
+    basePackages: ['_framework'],
+  ),
+)
+```
+
+Module resolution order: game package modules override framework modules with the same name. The entry script always comes from the last package (game package).

lib/flame_lua_runtime.dart

@@ -16,8 +16,11 @@ export 'runtime/host/runtime_host_bridge.dart'
 export 'runtime/packages/game_package_repository.dart'
     show
         AssetGamePackageRepository,
+        FileGamePackageRepository,
         GamePackageRepository,
         RemoteGamePackageRepository;
 export 'runtime/scripting/lua_dardo_script_engine.dart'
     show LuaDardoScriptEngine;
 export 'runtime/scripting/script_engine.dart' show ScriptEngine;
+export 'runtime/storage/runtime_storage_manager.dart'
+    show RuntimeStorageManager;

lib/runtime/game/flame_lua_game.dart

@@ -24,6 +24,7 @@ import '../display/runtime_viewport.dart';
 import '../resources/game_resource_manager.dart';
 import '../scripting/runtime_script_services.dart';
 import '../scripting/script_engine.dart';
+import '../storage/runtime_storage_manager.dart';
 import 'runtime_locale.dart';
 import 'runtime_options.dart';
 
@@ -73,6 +74,7 @@ class FlameLuaGame extends FlameGame with PanDetector, ScrollDetector {
   late final PositionComponent _viewportRoot;
   RuntimeNetworkManager? _network;
   RuntimeHostBridgeManager? _hostBridgeManager;
+  RuntimeStorageManager? _storage;
   RuntimeViewportConfig? _viewportConfig;
   late final CommandExecutor _commands;
   RuntimeSession? _session;
@@ -117,6 +119,7 @@ class FlameLuaGame extends FlameGame with PanDetector, ScrollDetector {
       'initialized': true,
       'images': _resources.imagesDebugJson(),
       'audio': _audio.audioDebugJson(),
+      'storage': _storage?.debugJson() ?? const {},
     };
   }
 
@@ -142,18 +145,22 @@ class FlameLuaGame extends FlameGame with PanDetector, ScrollDetector {
         diagnostics: diagnostics,
       );
       _hostBridgeManager = hostBridgeManager;
+      final storage = await RuntimeStorageManager.create(gameId: gameId);
+      _storage = storage;
       final activation =
           await PackageActivationController(
             repository: _packageRepository,
             resources: _createResourceManager(),
             scriptEngine: _bootstrapScriptEngine,
             audio: _createAudioManager(),
+            runtimeOptions: runtimeOptions,
             resourceManagerFactory: _createResourceManager,
             audioManagerFactory: _createAudioManager,
             scriptEngineFactory: _scriptEngineFactory,
             scriptServices: RuntimeScriptServices(
               network: network,
               hostBridge: hostBridgeManager,
+              storage: storage,
             ),
             store: StablePackageStore(runtimeOptions: runtimeOptions),
             assetFallback: AssetGamePackageRepository(
@@ -174,6 +181,25 @@ class FlameLuaGame extends FlameGame with PanDetector, ScrollDetector {
       _resources = activation.resources;
       _audio = activation.audio ?? _createAudioManager();
       _scriptEngine = activation.scriptEngine;
+
+      // 合并所有包的翻译字典，框架包先、游戏包后，后加载的覆盖先加载的。
+      final mergedTranslations = <String, Map<String, String>>{};
+      for (final package in activation.packages) {
+        for (final entry in package.manifest.translations.entries) {
+          mergedTranslations.putIfAbsent(entry.key, () => {})
+              .addAll(entry.value);
+        }
+      }
+      final resolvedLocale = RuntimeLocaleResolver.resolve(
+        requested: _localeOverride ?? PlatformDispatcher.instance.locale,
+        defaultLocale: activation.package.manifest.defaultLocale,
+        supportedLocales: activation.package.manifest.supportedLocales,
+      );
+      _scriptEngine.setTranslations(
+        locale: resolvedLocale.resolved,
+        translations: mergedTranslations,
+      );
+
       _viewportConfig = activation.package.manifest.display.toViewportConfig();
       _viewportRoot = PositionComponent();
       add(_viewportRoot);

lib/runtime/game/runtime_options.dart

@@ -1,7 +1,31 @@
 class RuntimeOptions {
-  const RuntimeOptions({this.runtimeLuaRoot = defaultRuntimeLuaRoot});
+  const RuntimeOptions({
+    this.runtimeLuaRoot = defaultRuntimeLuaRoot,
+    this.basePackages = const [],
+    this.runtimeVersion = '0.0.0',
+    this.hostBuild = 0,
+    this.channel = 'dev',
+    this.platform,
+  });
 
   static const defaultRuntimeLuaRoot = 'assets/runtime/lua';
 
   final String runtimeLuaRoot;
+
+  // 框架包 gameId 列表，按顺序先于游戏包加载。
+  // 后加载的同名模块覆盖先加载的。
+  final List<String> basePackages;
+
+  // 宿主 Flutter App 当前集成的 Lua Runtime 版本。
+  // 远程包可通过 minRuntimeVersion/maxRuntimeVersion 限制兼容范围。
+  final String runtimeVersion;
+
+  // 宿主 App 构建号。远程包可通过 minHostBuild/maxHostBuild 避免旧 App 拉取新包。
+  final int hostBuild;
+
+  // dev/staging/prod 等发布通道，用于服务器和客户端双重筛选远程包。
+  final String channel;
+
+  // 平台名，例如 windows/android/ios。为空时 Runtime 会尝试自动识别。
+  final String? platform;
 }

lib/runtime/packages/game_package_activation_controller.dart

@@ -1,4 +1,5 @@
 import '../audio/runtime_audio_manager.dart';
+import '../game/runtime_options.dart';
 import '../models/game_diff.dart';
 import '../resources/game_resource_manager.dart';
 import '../scripting/runtime_script_services.dart';
@@ -15,6 +16,7 @@ class PackageActivationController {
     required this.scriptEngine,
     this.audio,
     this.runtimeApiVersion = 1,
+    this.runtimeOptions = const RuntimeOptions(),
     this.store = const StablePackageStore(),
     this.assetFallback = const AssetGamePackageRepository(),
     this.resourceManagerFactory,
@@ -28,6 +30,7 @@ class PackageActivationController {
   final ScriptEngine scriptEngine;
   final RuntimeAudioManager? audio;
   final int runtimeApiVersion;
+  final RuntimeOptions runtimeOptions;
   final StablePackageStore store;
   final GamePackageRepository assetFallback;
   final GameResourceManager Function()? resourceManagerFactory;
@@ -143,12 +146,31 @@ class PackageActivationController {
     try {
       await verifier.verify(candidate);
       _ensureContinue(shouldContinue);
+
+      // 加载 base packages（框架包），按 runtimeOptions.basePackages 顺序。
+      final basePackages = <GamePackage>[];
+      for (final baseId in runtimeOptions.basePackages) {
+        final baseCandidates = await _candidatePackages(baseId, shouldContinue);
+        for (final baseCandidate in baseCandidates) {
+          try {
+            await verifier.verify(baseCandidate);
+            basePackages.add(baseCandidate);
+            break;
+          } catch (_) {
+            // Try next candidate.
+          }
+        }
+      }
+
       await preparedResources.mount(candidate);
       _ensureContinue(shouldContinue);
       await preparedAudio?.mount(candidate);
       _ensureContinue(shouldContinue);
-      await preparedScriptEngine.loadPackage(
+
-        candidate,
+      // 合并 base + game 包，传给脚本引擎。
+      final allPackages = [...basePackages, candidate];
+      await preparedScriptEngine.loadPackages(
+        allPackages,
         services: scriptServices,
       );
       _ensureContinue(shouldContinue);
@@ -164,6 +186,7 @@ class PackageActivationController {
       _ensureContinue(shouldContinue);
       return PackageActivationPlan(
         package: candidate,
+        packages: allPackages,
         initialDiff: diff,
         resources: preparedResources,
         scriptEngine: preparedScriptEngine,
@@ -197,6 +220,7 @@ class PackageActivationController {
 class PackageActivationPlan {
   const PackageActivationPlan({
     required this.package,
+    required this.packages,
     required this.initialDiff,
     required this.resources,
     required this.scriptEngine,
@@ -204,6 +228,7 @@ class PackageActivationPlan {
   });
 
   final GamePackage package;
+  final List<GamePackage> packages;
   final GameDiff initialDiff;
   final GameResourceManager resources;
   final ScriptEngine scriptEngine;
@@ -213,6 +238,7 @@ class PackageActivationPlan {
 class PackageActivationResult {
   const PackageActivationResult({
     required this.package,
+    required this.packages,
     required this.initialDiff,
     required this.resources,
     required this.scriptEngine,
@@ -222,6 +248,7 @@ class PackageActivationResult {
   factory PackageActivationResult.fromPlan(PackageActivationPlan plan) {
     return PackageActivationResult(
       package: plan.package,
+      packages: plan.packages,
       initialDiff: plan.initialDiff,
       resources: plan.resources,
       scriptEngine: plan.scriptEngine,
@@ -230,6 +257,7 @@ class PackageActivationResult {
   }
 
   final GamePackage package;
+  final List<GamePackage> packages;
   final GameDiff initialDiff;
   final GameResourceManager resources;
   final ScriptEngine scriptEngine;

lib/runtime/packages/game_package_manifest.dart

@@ -15,6 +15,8 @@ class GamePackageManifest {
     this.display = const GameDisplayConfig(),
     this.resources = const {},
     this.modules = const {},
+    this.translations = const {},
+    this.base,
   });
 
   final String gameId;
@@ -29,6 +31,13 @@ class GamePackageManifest {
   final Map<String, GameResource> resources;
   final Map<String, String> modules;
 
+  /// 翻译字典：locale → { key → translatedText }。
+  /// Runtime 会按包加载顺序合并，游戏包覆盖框架包。
+  final Map<String, Map<String, String>> translations;
+
+  /// 依赖的框架包 gameId。加载时会先加载框架包，再加载游戏包。
+  final String? base;
+
   static GamePackageManifest fromJsonString(String source) {
     return fromMap(jsonDecode(source) as Map<String, Object?>);
   }
@@ -58,6 +67,28 @@ class GamePackageManifest {
       }
     }
 
+    final base = map['base'] as String?;
+
+    final translationsValue = map['translations'];
+    final translations = <String, Map<String, String>>{};
+    if (translationsValue is Map) {
+      for (final entry in translationsValue.entries) {
+        if (entry.key is! String || entry.value is! Map) {
+          throw const FormatException('manifest.translations must be a map');
+        }
+        final localeDict = <String, String>{};
+        for (final kv in (entry.value as Map).entries) {
+          if (kv.key is! String || kv.value is! String) {
+            throw const FormatException(
+              'manifest.translations values must be string maps',
+            );
+          }
+          localeDict[kv.key as String] = kv.value as String;
+        }
+        translations[entry.key as String] = localeDict;
+      }
+    }
+
     final defaultLocale = (map['defaultLocale'] as String?) ?? 'en';
     final supportedLocales = _stringList(
       map,
@@ -89,6 +120,8 @@ class GamePackageManifest {
       display: display,
       resources: resources,
       modules: modules,
+      translations: translations,
+      base: base,
     );
   }
 

lib/runtime/packages/game_package_repository.dart

@@ -38,6 +38,35 @@ class AssetGamePackageRepository implements GamePackageRepository {
   }
 }
 
+class FileGamePackageRepository implements GamePackageRepository {
+  const FileGamePackageRepository({
+    required this.baseDirectory,
+    this.runtimeOptions = const RuntimeOptions(),
+  });
+
+  final String baseDirectory;
+  final RuntimeOptions runtimeOptions;
+
+  @override
+  Future<GamePackage> load(String gameId) async {
+    final root = Directory(p.join(baseDirectory, gameId));
+    final manifestFile = File(p.join(root.path, 'manifest.json'));
+    if (!manifestFile.existsSync()) {
+      throw FileSystemException(
+        'Game package manifest not found',
+        manifestFile.path,
+      );
+    }
+    return GamePackage.file(
+      rootPath: root.path,
+      manifest: GamePackageManifest.fromJsonString(
+        await manifestFile.readAsString(),
+      ),
+      runtimeLuaRoot: runtimeOptions.runtimeLuaRoot,
+    );
+  }
+}
+
 class RemoteGamePackageRepository implements GamePackageRepository {
   RemoteGamePackageRepository({
     required this.baseUri,
@@ -103,6 +132,10 @@ class RemoteGamePackageRepository implements GamePackageRepository {
     if (remoteManifest.gameId != gameId) {
       throw const FormatException('Remote manifest gameId mismatch');
     }
+    remoteManifest.compatibility.verify(
+      runtimeApiVersion: runtimeApiVersion,
+      runtimeOptions: runtimeOptions,
+    );
 
     final packageRoot = await _downloadAndExtract(
       client,
@@ -130,7 +163,7 @@ class RemoteGamePackageRepository implements GamePackageRepository {
     http.Client client,
     String gameId,
   ) async {
-    final uri = baseUri.resolve('$gameId/remote_manifest.json');
+    final uri = _remoteManifestUri(gameId);
     final response = await client.get(uri);
     if (response.statusCode != 200) {
       throw HttpException(
@@ -143,6 +176,19 @@ class RemoteGamePackageRepository implements GamePackageRepository {
     );
   }
 
+  Uri _remoteManifestUri(String gameId) {
+    final uri = baseUri.resolve('$gameId/remote_manifest.json');
+    final query = Map<String, String>.from(uri.queryParameters)
+      ..addAll({
+        'runtimeApiVersion': runtimeApiVersion.toString(),
+        'runtimeVersion': runtimeOptions.runtimeVersion,
+        'hostBuild': runtimeOptions.hostBuild.toString(),
+        'platform': _platformName(runtimeOptions.platform),
+        'channel': runtimeOptions.channel,
+      });
+    return uri.replace(queryParameters: query);
+  }
+
   Future<Directory> _downloadAndExtract(
     http.Client client,
     String gameId,
@@ -200,12 +246,14 @@ class RemotePackageManifest {
     required this.version,
     required this.packageUrl,
     required this.sha256,
+    this.compatibility = const RemotePackageCompatibility(),
   });
 
   final String gameId;
   final String version;
   final Uri packageUrl;
   final String sha256;
+  final RemotePackageCompatibility compatibility;
 
   static RemotePackageManifest fromMap(Map<String, Object?> map) {
     return RemotePackageManifest(
@@ -213,6 +261,7 @@ class RemotePackageManifest {
       version: _string(map, 'version'),
       packageUrl: Uri.parse(_string(map, 'packageUrl')),
       sha256: _string(map, 'sha256'),
+      compatibility: RemotePackageCompatibility.fromMap(map['compat']),
     );
   }
 
@@ -224,3 +273,182 @@ class RemotePackageManifest {
     throw FormatException('remote_manifest.$key must be a non-empty string');
   }
 }
+
+class RemotePackageCompatibility {
+  const RemotePackageCompatibility({
+    this.runtimeApiVersion,
+    this.minRuntimeVersion,
+    this.maxRuntimeVersion,
+    this.minHostBuild,
+    this.maxHostBuild,
+    this.platforms = const [],
+    this.channels = const [],
+  });
+
+  final int? runtimeApiVersion;
+  final String? minRuntimeVersion;
+  final String? maxRuntimeVersion;
+  final int? minHostBuild;
+  final int? maxHostBuild;
+  final List<String> platforms;
+  final List<String> channels;
+
+  static RemotePackageCompatibility fromMap(Object? value) {
+    if (value == null) {
+      return const RemotePackageCompatibility();
+    }
+    if (value is! Map) {
+      throw const FormatException('remote_manifest.compat must be a map');
+    }
+    final map = Map<String, Object?>.from(value);
+    return RemotePackageCompatibility(
+      runtimeApiVersion: _optionalInt(map, 'runtimeApiVersion'),
+      minRuntimeVersion: _optionalString(map, 'minRuntimeVersion'),
+      maxRuntimeVersion: _optionalString(map, 'maxRuntimeVersion'),
+      minHostBuild: _optionalInt(map, 'minHostBuild'),
+      maxHostBuild: _optionalInt(map, 'maxHostBuild'),
+      platforms: _optionalStringList(map, 'platforms'),
+      channels: _optionalStringList(map, 'channels'),
+    );
+  }
+
+  void verify({
+    required int runtimeApiVersion,
+    required RuntimeOptions runtimeOptions,
+  }) {
+    if (this.runtimeApiVersion != null &&
+        this.runtimeApiVersion != runtimeApiVersion) {
+      throw const FormatException('Remote package runtimeApiVersion mismatch');
+    }
+    if (minRuntimeVersion != null &&
+        _compareVersions(runtimeOptions.runtimeVersion, minRuntimeVersion!) <
+            0) {
+      throw const FormatException('Remote package requires newer runtime');
+    }
+    if (maxRuntimeVersion != null &&
+        _compareVersions(runtimeOptions.runtimeVersion, maxRuntimeVersion!) >
+            0) {
+      throw const FormatException(
+        'Remote package does not support this runtime',
+      );
+    }
+    if (minHostBuild != null && runtimeOptions.hostBuild < minHostBuild!) {
+      throw const FormatException('Remote package requires newer host build');
+    }
+    if (maxHostBuild != null && runtimeOptions.hostBuild > maxHostBuild!) {
+      throw const FormatException(
+        'Remote package does not support this host build',
+      );
+    }
+    final platform = _platformName(runtimeOptions.platform);
+    if (platforms.isNotEmpty && !platforms.contains(platform)) {
+      throw const FormatException(
+        'Remote package does not support this platform',
+      );
+    }
+    if (channels.isNotEmpty && !channels.contains(runtimeOptions.channel)) {
+      throw const FormatException(
+        'Remote package does not support this channel',
+      );
+    }
+  }
+
+  static String? _optionalString(Map<String, Object?> map, String key) {
+    final value = map[key];
+    if (value == null) {
+      return null;
+    }
+    if (value is String && value.isNotEmpty) {
+      return value;
+    }
+    throw FormatException('remote_manifest.compat.$key must be a string');
+  }
+
+  static int? _optionalInt(Map<String, Object?> map, String key) {
+    final value = map[key];
+    if (value == null) {
+      return null;
+    }
+    if (value is num) {
+      return value.toInt();
+    }
+    throw FormatException('remote_manifest.compat.$key must be an integer');
+  }
+
+  static List<String> _optionalStringList(
+    Map<String, Object?> map,
+    String key,
+  ) {
+    final value = map[key];
+    if (value == null) {
+      return const [];
+    }
+    if (value is! List) {
+      throw FormatException(
+        'remote_manifest.compat.$key must be a string list',
+      );
+    }
+    return value
+        .map((item) {
+          if (item is String && item.isNotEmpty) {
+            return item;
+          }
+          throw FormatException(
+            'remote_manifest.compat.$key must be a string list',
+          );
+        })
+        .toList(growable: false);
+  }
+}
+
+String _platformName(String? explicitPlatform) {
+  if (explicitPlatform != null && explicitPlatform.isNotEmpty) {
+    return explicitPlatform;
+  }
+  if (Platform.isAndroid) {
+    return 'android';
+  }
+  if (Platform.isIOS) {
+    return 'ios';
+  }
+  if (Platform.isMacOS) {
+    return 'macos';
+  }
+  if (Platform.isWindows) {
+    return 'windows';
+  }
+  if (Platform.isLinux) {
+    return 'linux';
+  }
+  if (Platform.isFuchsia) {
+    return 'fuchsia';
+  }
+  return 'unknown';
+}
+
+int _compareVersions(String left, String right) {
+  final leftParts = _versionParts(left);
+  final rightParts = _versionParts(right);
+  final count = leftParts.length > rightParts.length
+      ? leftParts.length
+      : rightParts.length;
+  for (var index = 0; index < count; index++) {
+    final leftValue = index < leftParts.length ? leftParts[index] : 0;
+    final rightValue = index < rightParts.length ? rightParts[index] : 0;
+    if (leftValue != rightValue) {
+      return leftValue.compareTo(rightValue);
+    }
+  }
+  return 0;
+}
+
+List<int> _versionParts(String value) {
+  final normalized = value.split('-').first;
+  return normalized
+      .split('.')
+      .map((part) {
+        final digits = RegExp(r'^\d+').firstMatch(part)?.group(0);
+        return int.tryParse(digits ?? '') ?? 0;
+      })
+      .toList(growable: false);
+}

lib/runtime/packages/stable_package_store.dart

@@ -32,34 +32,31 @@ class StablePackageStore {
       return;
     }
     final marker = await _markerFile(package.manifest.gameId);
-    marker.createSync(recursive: true);
+    marker.parent.createSync(recursive: true);
     final previous = await stablePackage(package.manifest.gameId);
     final data = {
       'current': package.rootPath,
       if (previous != null && previous.rootPath != package.rootPath)
         'previous': previous.rootPath,
     };
-    marker.writeAsStringSync(const JsonEncoder.withIndent('  ').convert(data));
+    final temporary = File('${marker.path}.tmp');
+    temporary.writeAsStringSync(
+      const JsonEncoder.withIndent('  ').convert(data),
+    );
+    if (marker.existsSync()) {
+      marker.deleteSync();
+    }
+    temporary.renameSync(marker.path);
   }
 
   Future<GamePackage?> stablePackage(String gameId) async {
-    final marker = await _markerFile(gameId);
+    final data = await _readMarker(gameId);
-    if (!marker.existsSync()) {
+    return _packageFromPath(data?['current']);
-      return null;
-    }
-    final data =
-        jsonDecode(await marker.readAsString()) as Map<String, Object?>;
-    return _packageFromPath(data['current']);
   }
 
   Future<GamePackage?> previousStablePackage(String gameId) async {
-    final marker = await _markerFile(gameId);
+    final data = await _readMarker(gameId);
-    if (!marker.existsSync()) {
+    return _packageFromPath(data?['previous']);
-      return null;
-    }
-    final data =
-        jsonDecode(await marker.readAsString()) as Map<String, Object?>;
-    return _packageFromPath(data['previous']);
   }
 
   Future<File> _markerFile(String gameId) async {
@@ -67,6 +64,26 @@ class StablePackageStore {
     return File(p.join(root.path, gameId, 'stable.json'));
   }
 
+  Future<Map<String, Object?>?> _readMarker(String gameId) async {
+    final marker = await _markerFile(gameId);
+    if (!marker.existsSync()) {
+      return null;
+    }
+    final source = await marker.readAsString();
+    if (source.trim().isEmpty) {
+      return null;
+    }
+    try {
+      final value = jsonDecode(source);
+      if (value is Map) {
+        return Map<String, Object?>.from(value);
+      }
+    } catch (_) {
+      return null;
+    }
+    return null;
+  }
+
   GamePackage? _packageFromPath(Object? pathValue) {
     if (pathValue is! String || pathValue.isEmpty) {
       return null;

lib/runtime/scripting/lua_dardo_script_engine.dart

@@ -8,6 +8,7 @@ import '../models/game_diff.dart';
 import '../models/runtime_event.dart';
 import '../network/runtime_network_manager.dart';
 import '../packages/game_package.dart';
+import '../storage/runtime_storage_manager.dart';
 import 'runtime_script_services.dart';
 import 'script_engine.dart';
 
@@ -27,15 +28,34 @@ class LuaDardoScriptEngine implements ScriptEngine {
   Future<void> loadPackage(
     GamePackage package, {
     RuntimeScriptServices services = const RuntimeScriptServices(),
+  }) {
+    return loadPackages([package], services: services);
+  }
+
+  @override
+  Future<void> loadPackages(
+    List<GamePackage> packages, {
+    RuntimeScriptServices services = const RuntimeScriptServices(),
   }) async {
+    if (packages.isEmpty) {
+      throw const FormatException('loadPackages requires at least one package');
+    }
+
     _services = services;
     _networkRequestCounter = 0;
     _hostCallCounter = 0;
-    final script = await package.readText(package.manifest.entry);
     _moduleScripts = {};
-    for (final entry in package.manifest.modules.entries) {
+
-      _moduleScripts[entry.key] = await package.readText(entry.value);
+    // 按顺序加载所有包的模块，后加载的同名模块覆盖先加载的。
+    for (final package in packages) {
+      for (final entry in package.manifest.modules.entries) {
+        _moduleScripts[entry.key] = await package.readText(entry.value);
+      }
     }
+
+    // 入口脚本使用最后一个包（游戏包）。
+    final entryPackage = packages.last;
+    final script = await entryPackage.readText(entryPackage.manifest.entry);
     _loadingModules.clear();
 
     _lua = LuaState.newState();
@@ -51,6 +71,69 @@ class LuaDardoScriptEngine implements ScriptEngine {
     }
   }
 
+  @override
+  void setTranslations({
+    required String locale,
+    required Map<String, Map<String, String>> translations,
+  }) {
+    _lua.getGlobal('runtime');
+    if (_lua.isNil(-1)) {
+      _lua.pop(1);
+      return;
+    }
+
+    _lua.newTable();
+
+    _lua.pushString(locale);
+    _lua.setField(-2, 'locale');
+
+    _lua.pushDartFunction((LuaState lua) {
+      lua.pushString(locale);
+      return 1;
+    });
+    _lua.setField(-2, 'get_locale');
+
+    _lua.pushDartFunction((LuaState lua) {
+      final key = lua.toStr(1);
+      if (key == null || key.isEmpty) {
+        if (lua.getTop() >= 2 && !lua.isNil(2)) {
+          lua.pushValue(2);
+        } else {
+          lua.pushString(key ?? '');
+        }
+        return 1;
+      }
+
+      final localeDict = translations[locale];
+      final value = localeDict?[key];
+      if (value != null) {
+        lua.pushString(value);
+        return 1;
+      }
+
+      for (final entry in translations.entries) {
+        if (entry.key != locale) {
+          final fallbackValue = entry.value[key];
+          if (fallbackValue != null) {
+            lua.pushString(fallbackValue);
+            return 1;
+          }
+        }
+      }
+
+      if (lua.getTop() >= 2 && !lua.isNil(2)) {
+        lua.pushValue(2);
+      } else {
+        lua.pushString(key);
+      }
+      return 1;
+    });
+    _lua.setField(-2, 't');
+
+    _lua.setField(-2, 'i18n');
+    _lua.pop(1);
+  }
+
   @override
   bool smokeTest(Map<String, Object?> context) {
     _lua.getGlobal('smoke_test');
@@ -147,6 +230,18 @@ class LuaDardoScriptEngine implements ScriptEngine {
     _lua.pushDartFunction(_hostRespond);
     _lua.setField(-2, 'host_respond');
 
+    _lua.pushDartFunction(_storageGet);
+    _lua.setField(-2, 'storage_get');
+
+    _lua.pushDartFunction(_storageSet);
+    _lua.setField(-2, 'storage_set');
+
+    _lua.pushDartFunction(_storageRemove);
+    _lua.setField(-2, 'storage_remove');
+
+    _lua.pushDartFunction(_storageClear);
+    _lua.setField(-2, 'storage_clear');
+
     _lua.setGlobal('runtime');
   }
 
@@ -253,6 +348,47 @@ class LuaDardoScriptEngine implements ScriptEngine {
     return 1;
   }
 
+  int _storageGet(LuaState lua) {
+    final storage = _requireStorage();
+    final key = lua.toStr(1);
+    if (key == null || key.isEmpty) {
+      throw const FormatException(
+        'runtime.storage_get(key, defaultValue) requires key',
+      );
+    }
+    final defaultValue = _readValue(2);
+    _pushValue(storage.getValue(key, defaultValue));
+    return 1;
+  }
+
+  int _storageSet(LuaState lua) {
+    final storage = _requireStorage();
+    final key = lua.toStr(1);
+    if (key == null || key.isEmpty) {
+      throw const FormatException(
+        'runtime.storage_set(key, value) requires key',
+      );
+    }
+    final value = _readValue(2);
+    lua.pushBoolean(storage.setValue(key, value));
+    return 1;
+  }
+
+  int _storageRemove(LuaState lua) {
+    final storage = _requireStorage();
+    final key = lua.toStr(1);
+    if (key == null || key.isEmpty) {
+      throw const FormatException('runtime.storage_remove(key) requires key');
+    }
+    lua.pushBoolean(storage.remove(key));
+    return 1;
+  }
+
+  int _storageClear(LuaState lua) {
+    lua.pushBoolean(_requireStorage().clear());
+    return 1;
+  }
+
   RuntimeHostBridgeManager _requireHostBridge() {
     final hostBridge = _services.hostBridge;
     if (hostBridge == null) {
@@ -274,6 +410,14 @@ class LuaDardoScriptEngine implements ScriptEngine {
     return network;
   }
 
+  RuntimeStorageManager _requireStorage() {
+    final storage = _services.storage;
+    if (storage == null) {
+      throw StateError('Runtime storage service is not installed');
+    }
+    return storage;
+  }
+
   String _nextNetworkRequestId(String prefix) {
     _networkRequestCounter += 1;
     return '$prefix:$_networkRequestCounter';

lib/runtime/scripting/runtime_script_services.dart

@@ -1,9 +1,11 @@
 import '../host/runtime_host_bridge.dart';
 import '../network/runtime_network_manager.dart';
+import '../storage/runtime_storage_manager.dart';
 
 class RuntimeScriptServices {
-  const RuntimeScriptServices({this.network, this.hostBridge});
+  const RuntimeScriptServices({this.network, this.hostBridge, this.storage});
 
   final RuntimeNetworkManager? network;
   final RuntimeHostBridgeManager? hostBridge;
+  final RuntimeStorageManager? storage;
 }

lib/runtime/scripting/script_engine.dart

@@ -4,14 +4,28 @@ import '../packages/game_package.dart';
 import 'runtime_script_services.dart';
 
 abstract interface class ScriptEngine {
+  // 加载单个包（向后兼容，内部调 loadPackages([package])）。
   Future<void> loadPackage(
     GamePackage package, {
     RuntimeScriptServices services = const RuntimeScriptServices(),
   });
 
+  // 加载多个包，按顺序合并模块，后加载的同名模块覆盖先加载的。
+  // 入口脚本使用最后一个包。
+  Future<void> loadPackages(
+    List<GamePackage> packages, {
+    RuntimeScriptServices services = const RuntimeScriptServices(),
+  });
+
   bool smokeTest(Map<String, Object?> context);
 
   GameDiff init(Map<String, Object?> context);
 
   GameDiff dispatchEvent(RuntimeEvent event);
+
+  /// 设置翻译字典和当前语言，Lua 侧可通过 runtime.i18n.t(key, fallback) 查询。
+  void setTranslations({
+    required String locale,
+    required Map<String, Map<String, String>> translations,
+  });
 }

lib/runtime/storage/runtime_storage_manager.dart

@@ -0,0 +1,92 @@
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:path/path.dart' as p;
+import 'package:path_provider/path_provider.dart';
+
+class RuntimeStorageManager {
+  RuntimeStorageManager._(this._file, this._values);
+
+  final File _file;
+  final Map<String, Object?> _values;
+
+  static Future<RuntimeStorageManager> create({required String gameId}) async {
+    final root = await getApplicationSupportDirectory();
+    final directory = Directory(p.join(root.path, 'flame_lua_storage'));
+    if (!directory.existsSync()) {
+      directory.createSync(recursive: true);
+    }
+
+    final file = File(p.join(directory.path, '$gameId.json'));
+    if (!file.existsSync()) {
+      return RuntimeStorageManager._(file, <String, Object?>{});
+    }
+
+    try {
+      final raw = jsonDecode(file.readAsStringSync());
+      if (raw is Map) {
+        return RuntimeStorageManager._(file, Map<String, Object?>.from(raw));
+      }
+    } catch (_) {
+      // Corrupt storage should not prevent a game from loading.
+    }
+
+    return RuntimeStorageManager._(file, <String, Object?>{});
+  }
+
+  Object? getValue(String key, [Object? defaultValue]) {
+    if (!_values.containsKey(key)) {
+      return defaultValue;
+    }
+    return _values[key];
+  }
+
+  bool setValue(String key, Object? value) {
+    _values[key] = _normalize(value);
+    _flush();
+    return true;
+  }
+
+  bool remove(String key) {
+    final removed = _values.remove(key) != null;
+    if (removed) {
+      _flush();
+    }
+    return removed;
+  }
+
+  bool clear() {
+    if (_values.isEmpty) {
+      return false;
+    }
+    _values.clear();
+    _flush();
+    return true;
+  }
+
+  Map<String, Object?> debugJson() => Map<String, Object?>.from(_values);
+
+  Object? _normalize(Object? value) {
+    if (value == null || value is bool || value is num || value is String) {
+      return value;
+    }
+    if (value is List) {
+      return value.map(_normalize).toList(growable: false);
+    }
+    if (value is Map) {
+      return {
+        for (final entry in value.entries)
+          entry.key.toString(): _normalize(entry.value),
+      };
+    }
+    return value.toString();
+  }
+
+  void _flush() {
+    final parent = _file.parent;
+    if (!parent.existsSync()) {
+      parent.createSync(recursive: true);
+    }
+    _file.writeAsStringSync(jsonEncode(_values));
+  }
+}

test/runtime/events/runtime_event_dispatcher_test.dart

@@ -138,6 +138,7 @@ void main() {
       expect(script.events.map((event) => event.target), ['bad', 'good']);
     });
   });
+
 }
 
 RuntimeSession _activeSession() {
@@ -156,6 +157,12 @@ class _FakeScriptEngine implements ScriptEngine {
     RuntimeScriptServices services = const RuntimeScriptServices(),
   }) async {}
 
+  @override
+  Future<void> loadPackages(
+    List<GamePackage> packages, {
+    RuntimeScriptServices services = const RuntimeScriptServices(),
+  }) async {}
+
   @override
   bool smokeTest(Map<String, Object?> context) => true;
 
@@ -171,4 +178,10 @@ class _FakeScriptEngine implements ScriptEngine {
     }
     return GameDiff.empty;
   }
+
+  @override
+  void setTranslations({
+    required String locale,
+    required Map<String, Map<String, String>> translations,
+  }) {}
 }

test/runtime/game/flame_lua_game_test.dart

@@ -33,6 +33,7 @@ void main() {
       await expectLater(game.callLua('host.ready'), throwsA(isA<StateError>()));
     });
   });
+
 }
 
 class _FakeScriptEngine implements ScriptEngine {
@@ -44,6 +45,14 @@ class _FakeScriptEngine implements ScriptEngine {
     throw UnimplementedError();
   }
 
+  @override
+  Future<void> loadPackages(
+    List<GamePackage> packages, {
+    RuntimeScriptServices services = const RuntimeScriptServices(),
+  }) {
+    throw UnimplementedError();
+  }
+
   @override
   GameDiff dispatchEvent(RuntimeEvent event) {
     throw UnimplementedError();
@@ -58,6 +67,12 @@ class _FakeScriptEngine implements ScriptEngine {
   bool smokeTest(Map<String, Object?> context) {
     throw UnimplementedError();
   }
+
+  @override
+  void setTranslations({
+    required String locale,
+    required Map<String, Map<String, String>> translations,
+  }) {}
 }
 
 class _FakePackageRepository implements GamePackageRepository {

test/runtime/packages/game_package_activation_controller_test.dart

@@ -217,6 +217,7 @@ void main() {
       expect(store.markedPackages, [fallback.rootPath]);
     });
   });
+
 }
 
 Map<String, Object?> _context(GamePackage package) {
@@ -366,6 +367,17 @@ class _FakeScriptEngine implements ScriptEngine {
     loadedPackages.add(package.rootPath);
   }
 
+  @override
+  Future<void> loadPackages(
+    List<GamePackage> packages, {
+    RuntimeScriptServices services = const RuntimeScriptServices(),
+  }) async {
+    for (final package in packages) {
+      _package = package;
+      loadedPackages.add(package.rootPath);
+    }
+  }
+
   @override
   bool smokeTest(Map<String, Object?> context) {
     return !smokeFailures.contains(_package?.rootPath);
@@ -382,6 +394,12 @@ class _FakeScriptEngine implements ScriptEngine {
 
   @override
   GameDiff dispatchEvent(RuntimeEvent event) => GameDiff.empty;
+
+  @override
+  void setTranslations({
+    required String locale,
+    required Map<String, Map<String, String>> translations,
+  }) {}
 }
 
 const _validScript = '''

test/runtime/packages/game_package_repository_test.dart

@@ -0,0 +1,220 @@
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:flame_lua_runtime/runtime/game/runtime_options.dart';
+import 'package:flame_lua_runtime/runtime/packages/game_package.dart';
+import 'package:flame_lua_runtime/runtime/packages/game_package_manifest.dart';
+import 'package:flame_lua_runtime/runtime/packages/game_package_repository.dart';
+import 'package:flame_lua_runtime/runtime/packages/stable_package_store.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:http/http.dart' as http;
+import 'package:http/testing.dart';
+
+void main() {
+  group('FileGamePackageRepository', () {
+    test('loads a package from a local development directory', () async {
+      final root = await Directory.systemTemp.createTemp('local_packages_');
+      addTearDown(() => root.deleteSync(recursive: true));
+      await _writePackage(root.path, 'gomoku', version: '0.2.0');
+
+      final package = await FileGamePackageRepository(
+        baseDirectory: root.path,
+        runtimeOptions: const RuntimeOptions(runtimeLuaRoot: 'runtime/lua'),
+      ).load('gomoku');
+
+      expect(package.source, GamePackageSource.file);
+      expect(package.manifest.gameId, 'gomoku');
+      expect(package.manifest.version, '0.2.0');
+      expect(package.runtimeLuaRoot, 'runtime/lua');
+      expect(await package.readText('scripts/main.lua'), contains('init'));
+    });
+  });
+
+  group('RemoteGamePackageRepository compatibility', () {
+    test(
+      'sends host compatibility query and falls back when incompatible',
+      () async {
+        late Uri requestedUri;
+        var downloadedPackage = false;
+        final fallback = await _createPackage('fallback');
+        final client = MockClient((request) async {
+          requestedUri = request.url;
+          if (request.url.path.endsWith('/remote_manifest.json')) {
+            return http.Response(
+              jsonEncode({
+                'gameId': 'gomoku',
+                'version': '2.0.0',
+                'packageUrl': 'http://example.test/packages/gomoku.zip',
+                'sha256': 'unused',
+                'compat': {
+                  'runtimeApiVersion': 1,
+                  'minRuntimeVersion': '1.2.0',
+                  'minHostBuild': 200,
+                  'platforms': ['windows'],
+                  'channels': ['prod'],
+                },
+              }),
+              200,
+            );
+          }
+          downloadedPackage = true;
+          return http.Response('not used', 500);
+        });
+
+        final package = await RemoteGamePackageRepository(
+          baseUri: Uri.parse('http://example.test/'),
+          client: client,
+          fallback: _SinglePackageRepository(fallback),
+          store: _EmptyStablePackageStore(),
+          runtimeOptions: const RuntimeOptions(
+            runtimeVersion: '1.1.0',
+            hostBuild: 100,
+            channel: 'prod',
+            platform: 'windows',
+          ),
+        ).load('gomoku');
+
+        expect(package.rootPath, fallback.rootPath);
+        expect(requestedUri.queryParameters['runtimeApiVersion'], '1');
+        expect(requestedUri.queryParameters['runtimeVersion'], '1.1.0');
+        expect(requestedUri.queryParameters['hostBuild'], '100');
+        expect(requestedUri.queryParameters['platform'], 'windows');
+        expect(requestedUri.queryParameters['channel'], 'prod');
+        expect(downloadedPackage, isFalse);
+      },
+    );
+  });
+
+  group('StablePackageStore', () {
+    const channel = MethodChannel('plugins.flutter.io/path_provider');
+
+    setUp(() {
+      TestWidgetsFlutterBinding.ensureInitialized();
+    });
+
+    tearDown(() async {
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+          .setMockMethodCallHandler(channel, null);
+    });
+
+    test('ignores empty or malformed stable marker files', () async {
+      final support = await Directory.systemTemp.createTemp('support_');
+      addTearDown(() => support.deleteSync(recursive: true));
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+          .setMockMethodCallHandler(channel, (call) async {
+            if (call.method == 'getApplicationSupportDirectory') {
+              return support.path;
+            }
+            return null;
+          });
+      final store = const StablePackageStore();
+      final gameDir = Directory('${support.path}/flame_lua_packages/gomoku')
+        ..createSync(recursive: true);
+      final marker = File('${gameDir.path}/stable.json');
+
+      marker.writeAsStringSync('');
+      expect(await store.stablePackage('gomoku'), isNull);
+      expect(await store.previousStablePackage('gomoku'), isNull);
+
+      marker.writeAsStringSync('{bad json');
+      expect(await store.stablePackage('gomoku'), isNull);
+      expect(await store.previousStablePackage('gomoku'), isNull);
+    });
+
+    test('writes stable marker atomically and reads current package', () async {
+      final support = await Directory.systemTemp.createTemp('support_');
+      addTearDown(() => support.deleteSync(recursive: true));
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+          .setMockMethodCallHandler(channel, (call) async {
+            if (call.method == 'getApplicationSupportDirectory') {
+              return support.path;
+            }
+            return null;
+          });
+      final package = await _createPackage('stable');
+      final store = const StablePackageStore();
+
+      await store.markStable(package);
+
+      final marker = File(
+        '${support.path}/flame_lua_packages/gomoku/stable.json',
+      );
+      expect(marker.existsSync(), isTrue);
+      expect(File('${marker.path}.tmp').existsSync(), isFalse);
+      final stable = await store.stablePackage('gomoku');
+      expect(stable?.rootPath, package.rootPath);
+    });
+  });
+}
+
+Future<GamePackage> _createPackage(String name) async {
+  final root = await Directory.systemTemp.createTemp('package_${name}_');
+  addTearDown(() => root.deleteSync(recursive: true));
+  await _writePackageRoot(root.path, gameId: 'gomoku', version: '1.0.0');
+  return GamePackage.file(
+    rootPath: root.path,
+    manifest: GamePackageManifest.fromJsonString(
+      await File('${root.path}/manifest.json').readAsString(),
+    ),
+  );
+}
+
+Future<void> _writePackage(
+  String baseDirectory,
+  String gameId, {
+  required String version,
+}) async {
+  final root = Directory('$baseDirectory/$gameId')..createSync(recursive: true);
+  await _writePackageRoot(root.path, gameId: gameId, version: version);
+}
+
+Future<void> _writePackageRoot(
+  String root, {
+  required String gameId,
+  required String version,
+}) async {
+  Directory('$root/scripts').createSync(recursive: true);
+  await File('$root/scripts/main.lua').writeAsString('''
+function smoke_test(ctx) return true end
+function init(ctx) return {} end
+function on_event(event) return {} end
+''');
+  await File('$root/manifest.json').writeAsString(
+    jsonEncode({
+      'gameId': gameId,
+      'name': gameId,
+      'version': version,
+      'runtimeApiVersion': 1,
+      'entry': 'scripts/main.lua',
+      'assetsBase': 'assets',
+    }),
+  );
+}
+
+class _SinglePackageRepository implements GamePackageRepository {
+  const _SinglePackageRepository(this.package);
+
+  final GamePackage package;
+
+  @override
+  Future<GamePackage> load(String gameId) async => package;
+}
+
+class _EmptyStablePackageStore implements StablePackageStore {
+  @override
+  Future<Directory> cacheRoot() => throw UnimplementedError();
+
+  @override
+  Future<void> markStable(GamePackage package) async {}
+
+  @override
+  Future<GamePackage?> previousStablePackage(String gameId) async => null;
+
+  @override
+  Future<GamePackage?> stablePackage(String gameId) async => null;
+
+  @override
+  Future<Directory> versionDirectory(String gameId, String version) =>
+      throw UnimplementedError();
+}

test/runtime/public_api_test.dart

@@ -4,7 +4,14 @@ import 'package:flutter_test/flutter_test.dart';
 void main() {
   test('public runtime API exposes minimal integration surface', () {
     const repository = AssetGamePackageRepository();
-    const options = RuntimeOptions(runtimeLuaRoot: 'custom/runtime/lua');
+    const fileRepository = FileGamePackageRepository(baseDirectory: 'packages');
+    const options = RuntimeOptions(
+      runtimeLuaRoot: 'custom/runtime/lua',
+      runtimeVersion: '1.2.0',
+      hostBuild: 12,
+      platform: 'windows',
+      channel: 'dev',
+    );
     const widget = LuaGameWidget(
       gameId: 'template',
       packageRepository: repository,
@@ -14,6 +21,11 @@ void main() {
     expect(widget.gameId, 'template');
     expect(widget.packageRepository, same(repository));
     expect(widget.runtimeOptions.runtimeLuaRoot, 'custom/runtime/lua');
+    expect(widget.runtimeOptions.runtimeVersion, '1.2.0');
+    expect(widget.runtimeOptions.hostBuild, 12);
+    expect(widget.runtimeOptions.platform, 'windows');
+    expect(widget.runtimeOptions.channel, 'dev');
+    expect(fileRepository.baseDirectory, 'packages');
     expect(LuaDardoScriptEngine.new, isA<ScriptEngine Function()>());
     expect(RuntimeLocaleResolver.localeFromTag('zh-Hans').scriptCode, 'Hans');
   });