feat: add gemini_sdk package wrapping Google Gemini CLI

packages/gemini_sdk/lib/gemini_sdk.dart

@@ -0,0 +1,7 @@
+library gemini_sdk;
+
+export 'src/client/gemini_agent_client.dart';
+export 'src/client/gemini_client.dart';
+export 'src/config/gemini_config.dart';
+export 'src/protocol/gemini_event.dart';
+export 'src/transport/gemini_transport.dart';

packages/gemini_sdk/lib/src/client/gemini_agent_client.dart

@@ -0,0 +1,90 @@
+import 'dart:async';
+
+import 'package:agent_sdk/agent_sdk.dart';
+
+import 'gemini_client.dart';
+
+/// Bridge that wraps [GeminiClient] and implements [AgentClient].
+///
+/// Since [GeminiClient] already works natively with `agent_sdk` types,
+/// this bridge is pure delegation — no type mapping needed.
+///
+/// Also implements [Interruptible] since abort is supported via process kill.
+class GeminiAgentClient implements AgentClient, Interruptible {
+  final GeminiClient _inner;
+
+  GeminiAgentClient(this._inner);
+
+  /// Access the inner [GeminiClient] for SDK-specific operations
+  /// (e.g. accessing [GeminiClient.geminiSessionId]).
+  GeminiClient get innerClient => _inner;
+
+  // ── Streams ──────────────────────────────────────────────
+
+  @override
+  Stream<AgentConversation> get conversation => _inner.conversation;
+
+  @override
+  Stream<void> get onTurnComplete => _inner.onTurnComplete;
+
+  @override
+  Stream<AgentProcessingStatus> get statusStream => _inner.statusStream;
+
+  @override
+  Stream<AgentInitData> get initDataStream => _inner.initDataStream;
+
+  @override
+  Stream<String?> get queuedMessage => _inner.queuedMessage;
+
+  // ── Current state ────────────────────────────────────────
+
+  @override
+  AgentConversation get currentConversation => _inner.currentConversation;
+
+  @override
+  AgentProcessingStatus get currentStatus => _inner.currentStatus;
+
+  @override
+  AgentInitData? get initData => _inner.initData;
+
+  @override
+  String? get currentQueuedMessage => _inner.currentQueuedMessage;
+
+  @override
+  String get sessionId => _inner.sessionId;
+
+  @override
+  String get workingDirectory => _inner.workingDirectory;
+
+  @override
+  Future<void> get initialized => _inner.initialized;
+
+  // ── Actions ──────────────────────────────────────────────
+
+  @override
+  void sendMessage(AgentMessage message) => _inner.sendMessage(message);
+
+  @override
+  Future<void> abort() => _inner.abort();
+
+  @override
+  Future<void> close() => _inner.close();
+
+  @override
+  Future<void> clearConversation() => _inner.clearConversation();
+
+  @override
+  void clearQueuedMessage() => _inner.clearQueuedMessage();
+
+  @override
+  void injectToolResult(AgentToolResultResponse toolResult) =>
+      _inner.injectToolResult(toolResult);
+
+  @override
+  T? getMcpServer<T>(String name) => null; // Gemini CLI manages its own tools
+
+  // ── Interruptible ────────────────────────────────────────
+
+  @override
+  Future<void> interrupt() => _inner.abort();
+}