fix(agent): correct LaunchAgent ProgramArguments path for SMAppService

SMAppService resolves ProgramArguments relative to the app bundle's
Contents/ directory, not the bundle root. The plist used
Contents/MacOS/ShadowsocksX-NG2Agent which resolved to a nonexistent
Contents/Contents/MacOS/... path, causing launchd to report
EX_CONFIG / spawn failed and the wrapper never started.

Change to MacOS/ShadowsocksX-NG2Agent so launchd finds the binary.

ShadowsocksX-NG2/App/LaunchAgentService.swift

@@ -10,7 +10,8 @@ protocol LaunchAgentControlling {
 }
 
 /// 生产实现：plist 必须位于 app bundle `Contents/Library/LaunchAgents/`，
-/// ProgramArguments 为 bundle 相对路径（launchd 按注册 app 的 bundle 解析）。
+/// ProgramArguments 为 Contents/ 相对路径（launchd 按注册 app 的 Contents/
+/// 解析）。
 struct SMAppLaunchAgentService: LaunchAgentControlling {
   static let plistName = "com.qiuyuzhou.ShadowsocksX-NG2.agent.plist"
 

ShadowsocksX-NG2/LaunchAgent/com.qiuyuzhou.ShadowsocksX-NG2.agent.plist

@@ -11,7 +11,7 @@
 	<string>com.qiuyuzhou.ShadowsocksX-NG2.agent</string>
 	<key>ProgramArguments</key>
 	<array>
-		<string>Contents/MacOS/ShadowsocksX-NG2Agent</string>
+		<string>MacOS/ShadowsocksX-NG2Agent</string>
 	</array>
 	<key>ThrottleInterval</key>
 	<integer>2</integer>

ShadowsocksX-NG2/project.yml

@@ -24,8 +24,8 @@ targets:
       # 领域核心：配置目录树、凭据引用与持久化（spec #21 D3/D5）
       - path: Domain
       # LaunchAgent 注册清单：SMAppService.agent(plistName:) 从 bundle 内
-      # Contents/Library/LaunchAgents/ 读取；ProgramArguments 用 bundle 相对路径
-      # （spec #21 D2，issue #27）。
+      # Contents/Library/LaunchAgents/ 读取；ProgramArguments 用 Contents/
+      # 相对路径（launchd 按注册 app 的 Contents/ 解析，spec #21 D2，issue #27）。
       - path: LaunchAgent/com.qiuyuzhou.ShadowsocksX-NG2.agent.plist
         buildPhase:
           copyFiles:
@@ -97,7 +97,7 @@ targets:
         - ShadowsocksX-NG2Tests
     dependencies:
       # 代理运行时 wrapper（BundleProgram，spec #21 D2）：以独立可执行文件装入
-      # Contents/MacOS，由 LaunchAgent plist 以 bundle 相对路径引用。
+      # Contents/MacOS，由 LaunchAgent plist 以 Contents/ 相对路径引用。
       - target: ShadowsocksX-NG2Agent
         copy:
           destination: wrapper