feat: add package source compatibility controls

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+- Remove deprecated, unused, or superseded code promptly when replacing behavior; do not leave parallel old paths unless a documented compatibility window requires them.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

@@ -20,6 +20,8 @@ It is designed for Flutter apps that want to host Lua-authored 2D games or inter
 - 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
 
@@ -95,6 +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:

docs/lua-package-format.md

@@ -142,6 +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:

lib/flame_lua_runtime.dart

@@ -16,9 +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;
+export 'runtime/storage/runtime_storage_manager.dart'
+    show RuntimeStorageManager;

lib/runtime/game/runtime_options.dart

@@ -2,6 +2,10 @@ class RuntimeOptions {
   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';
@@ -11,4 +15,17 @@ class RuntimeOptions {
   // 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

@@ -150,10 +150,7 @@ class PackageActivationController {
       // 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(
+        final baseCandidates = await _candidatePackages(baseId, shouldContinue);
-          baseId,
-          shouldContinue,
-        );
         for (final baseCandidate in baseCandidates) {
           try {
             await verifier.verify(baseCandidate);

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

@@ -289,7 +289,9 @@ class LuaDardoScriptEngine implements ScriptEngine {
     final storage = _requireStorage();
     final key = lua.toStr(1);
     if (key == null || key.isEmpty) {
-      throw const FormatException('runtime.storage_get(key, defaultValue) requires key');
+      throw const FormatException(
+        'runtime.storage_get(key, defaultValue) requires key',
+      );
     }
     final defaultValue = _readValue(2);
     _pushValue(storage.getValue(key, defaultValue));
@@ -300,7 +302,9 @@ class LuaDardoScriptEngine implements ScriptEngine {
     final storage = _requireStorage();
     final key = lua.toStr(1);
     if (key == null || key.isEmpty) {
-      throw const FormatException('runtime.storage_set(key, value) requires key');
+      throw const FormatException(
+        'runtime.storage_set(key, value) requires key',
+      );
     }
     final value = _readValue(2);
     lua.pushBoolean(storage.setValue(key, value));

lib/runtime/storage/runtime_storage_manager.dart

@@ -25,10 +25,7 @@ class RuntimeStorageManager {
     try {
       final raw = jsonDecode(file.readAsStringSync());
       if (raw is Map) {
-        return RuntimeStorageManager._(
+        return RuntimeStorageManager._(file, Map<String, Object?>.from(raw));
-          file,
-          Map<String, Object?>.from(raw),
-        );
       }
     } catch (_) {
       // Corrupt storage should not prevent a game from loading.
@@ -78,7 +75,8 @@ class RuntimeStorageManager {
     }
     if (value is Map) {
       return {
-        for (final entry in value.entries) entry.key.toString(): _normalize(entry.value),
+        for (final entry in value.entries)
+          entry.key.toString(): _normalize(entry.value),
       };
     }
     return value.toString();

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');
   });