diff --git a/.agents/skills/multi-agent-mux-ui/packages/mam_pty/.dart_tool/package_graph.json b/.agents/skills/multi-agent-mux-ui/packages/mam_pty/.dart_tool/package_graph.json
index aecd248..7b83227 100644
--- a/.agents/skills/multi-agent-mux-ui/packages/mam_pty/.dart_tool/package_graph.json
+++ b/.agents/skills/multi-agent-mux-ui/packages/mam_pty/.dart_tool/package_graph.json
@@ -16,129 +16,6 @@
         "test"
       ]
     },
-    {
-      "name": "shelf_web_socket",
-      "version": "1.0.4",
-      "dependencies": [
-        "shelf",
-        "stream_channel",
-        "web_socket_channel"
-      ]
-    },
-    {
-      "name": "shelf",
-      "version": "1.4.2",
-      "dependencies": [
-        "async",
-        "collection",
-        "http_parser",
-        "path",
-        "stack_trace",
-        "stream_channel"
-      ]
-    },
-    {
-      "name": "http_parser",
-      "version": "4.1.2",
-      "dependencies": [
-        "collection",
-        "source_span",
-        "string_scanner",
-        "typed_data"
-      ]
-    },
-    {
-      "name": "collection",
-      "version": "1.19.1",
-      "dependencies": []
-    },
-    {
-      "name": "typed_data",
-      "version": "1.4.0",
-      "dependencies": [
-        "collection"
-      ]
-    },
-    {
-      "name": "stream_channel",
-      "version": "2.1.4",
-      "dependencies": [
-        "async"
-      ]
-    },
-    {
-      "name": "stack_trace",
-      "version": "1.12.1",
-      "dependencies": [
-        "path"
-      ]
-    },
-    {
-      "name": "path",
-      "version": "1.9.1",
-      "dependencies": []
-    },
-    {
-      "name": "string_scanner",
-      "version": "1.4.1",
-      "dependencies": [
-        "source_span"
-      ]
-    },
-    {
-      "name": "ffi",
-      "version": "2.2.0",
-      "dependencies": []
-    },
-    {
-      "name": "source_span",
-      "version": "1.10.2",
-      "dependencies": [
-        "collection",
-        "path",
-        "term_glyph"
-      ]
-    },
-    {
-      "name": "term_glyph",
-      "version": "1.2.2",
-      "dependencies": []
-    },
-    {
-      "name": "web_socket_channel",
-      "version": "2.4.5",
-      "dependencies": [
-        "async",
-        "crypto",
-        "stream_channel",
-        "web"
-      ]
-    },
-    {
-      "name": "web",
-      "version": "0.5.1",
-      "dependencies": []
-    },
-    {
-      "name": "crypto",
-      "version": "3.0.7",
-      "dependencies": [
-        "typed_data"
-      ]
-    },
-    {
-      "name": "async",
-      "version": "2.13.1",
-      "dependencies": [
-        "collection",
-        "meta"
-      ]
-    },
-    {
-      "name": "meta",
-      "version": "1.19.0",
-      "dependencies": []
-    },
     {
       "name": "test",
       "version": "1.31.2",
@@ -170,6 +47,70 @@
         "yaml"
       ]
     },
+    {
+      "name": "meta",
+      "version": "1.19.0",
+      "dependencies": []
+    },
+    {
+      "name": "shelf_web_socket",
+      "version": "1.0.4",
+      "dependencies": [
+        "shelf",
+        "stream_channel",
+        "web_socket_channel"
+      ]
+    },
+    {
+      "name": "shelf",
+      "version": "1.4.2",
+      "dependencies": [
+        "async",
+        "collection",
+        "http_parser",
+        "path",
+        "stack_trace",
+        "stream_channel"
+      ]
+    },
+    {
+      "name": "ffi",
+      "version": "2.2.0",
+      "dependencies": []
+    },
+    {
+      "name": "yaml",
+      "version": "3.1.3",
+      "dependencies": [
+        "collection",
+        "source_span",
+        "string_scanner"
+      ]
+    },
+    {
+      "name": "webkit_inspection_protocol",
+      "version": "1.2.1",
+      "dependencies": [
+        "logging"
+      ]
+    },
+    {
+      "name": "web_socket_channel",
+      "version": "2.4.5",
+      "dependencies": [
+        "async",
+        "crypto",
+        "stream_channel",
+        "web"
+      ]
+    },
+    {
+      "name": "typed_data",
+      "version": "1.4.0",
+      "dependencies": [
+        "collection"
+      ]
+    },
     {
       "name": "test_core",
       "version": "0.6.19",
@@ -212,6 +153,101 @@
         "term_glyph"
       ]
     },
+    {
+      "name": "stream_channel",
+      "version": "2.1.4",
+      "dependencies": [
+        "async"
+      ]
+    },
+    {
+      "name": "stack_trace",
+      "version": "1.12.1",
+      "dependencies": [
+        "path"
+      ]
+    },
+    {
+      "name": "source_span",
+      "version": "1.10.2",
+      "dependencies": [
+        "collection",
+        "path",
+        "term_glyph"
+      ]
+    },
+    {
+      "name": "shelf_static",
+      "version": "1.1.3",
+      "dependencies": [
+        "convert",
+        "http_parser",
+        "mime",
+        "path",
+        "shelf"
+      ]
+    },
+    {
+      "name": "shelf_packages_handler",
+      "version": "3.0.2",
+      "dependencies": [
+        "path",
+        "shelf",
+        "shelf_static"
+      ]
+    },
+    {
+      "name": "pool",
+      "version": "1.5.2",
+      "dependencies": [
+        "async",
+        "stack_trace"
+      ]
+    },
+    {
+      "name": "path",
+      "version": "1.9.1",
+      "dependencies": []
+    },
+    {
+      "name": "package_config",
+      "version": "3.0.0",
+      "dependencies": [
+        "meta"
+      ]
+    },
+    {
+      "name": "node_preamble",
+      "version": "2.0.2",
+      "dependencies": []
+    },
+    {
+      "name": "matcher",
+      "version": "0.12.20",
+      "dependencies": [
+        "async",
+        "meta",
+        "stack_trace",
+        "term_glyph",
+        "test_api"
+      ]
+    },
+    {
+      "name": "io",
+      "version": "1.0.5",
+      "dependencies": [
+        "meta",
+        "path",
+        "string_scanner"
+      ]
+    },
+    {
+      "name": "http_multi_server",
+      "version": "3.2.2",
+      "dependencies": [
+        "async"
+      ]
+    },
     {
       "name": "coverage",
       "version": "1.15.1",
@@ -230,22 +266,99 @@
       ]
     },
     {
-      "name": "yaml",
-      "version": "3.1.3",
+      "name": "collection",
+      "version": "1.19.1",
+      "dependencies": []
+    },
+    {
+      "name": "boolean_selector",
+      "version": "2.1.2",
       "dependencies": [
-        "collection",
         "source_span",
         "string_scanner"
       ]
     },
     {
-      "name": "cli_config",
-      "version": "0.2.0",
+      "name": "async",
+      "version": "2.13.1",
       "dependencies": [
-        "args",
+        "collection",
+        "meta"
+      ]
+    },
+    {
+      "name": "analyzer",
+      "version": "14.1.0",
+      "dependencies": [
+        "_fe_analyzer_shared",
+        "collection",
+        "convert",
+        "crypto",
+        "glob",
+        "meta",
+        "package_config",
+        "path",
+        "pub_semver",
+        "source_span",
+        "watcher",
         "yaml"
       ]
     },
+    {
+      "name": "http_parser",
+      "version": "4.1.2",
+      "dependencies": [
+        "collection",
+        "source_span",
+        "string_scanner",
+        "typed_data"
+      ]
+    },
+    {
+      "name": "string_scanner",
+      "version": "1.4.1",
+      "dependencies": [
+        "source_span"
+      ]
+    },
+    {
+      "name": "logging",
+      "version": "1.3.0",
+      "dependencies": []
+    },
+    {
+      "name": "web",
+      "version": "0.5.1",
+      "dependencies": []
+    },
+    {
+      "name": "crypto",
+      "version": "3.0.7",
+      "dependencies": [
+        "typed_data"
+      ]
+    },
+    {
+      "name": "vm_service",
+      "version": "15.2.0",
+      "dependencies": []
+    },
+    {
+      "name": "source_maps",
+      "version": "0.10.13",
+      "dependencies": [
+        "source_span"
+      ]
+    },
+    {
+      "name": "source_map_stack_trace",
+      "version": "2.1.2",
+      "dependencies": [
+        "path",
+        "source_maps",
+        "stack_trace"
+      ]
+    },
     {
       "name": "glob",
       "version": "2.1.3",
@@ -266,146 +379,18 @@
       ]
     },
     {
-      "name": "shelf_packages_handler",
-      "version": "3.0.2",
-      "dependencies": [
-        "path",
-        "shelf",
-        "shelf_static"
-      ]
-    },
-    {
-      "name": "pool",
-      "version": "1.5.2",
-      "dependencies": [
-        "async",
-        "stack_trace"
-      ]
-    },
-    {
-      "name": "node_preamble",
-      "version": "2.0.2",
+      "name": "args",
+      "version": "2.7.0",
       "dependencies": []
     },
     {
-      "name": "boolean_selector",
-      "version": "2.1.2",
-      "dependencies": [
-        "source_span",
-        "string_scanner"
-      ]
+      "name": "term_glyph",
+      "version": "1.2.2",
+      "dependencies": []
     },
     {
-      "name": "source_map_stack_trace",
-      "version": "2.1.2",
-      "dependencies": [
-        "path",
-        "source_maps",
-        "stack_trace"
-      ]
-    },
-    {
-      "name": "source_maps",
-      "version": "0.10.13",
-      "dependencies": [
-        "source_span"
-      ]
-    },
-    {
-      "name": "file",
-      "version": "7.0.1",
-      "dependencies": [
-        "meta",
-        "path"
-      ]
-    },
-    {
-      "name": "webkit_inspection_protocol",
-      "version": "1.2.1",
-      "dependencies": [
-        "logging"
-      ]
-    },
-    {
-      "name": "shelf_static",
-      "version": "1.1.3",
-      "dependencies": [
-        "convert",
-        "http_parser",
-        "mime",
-        "path",
-        "shelf"
-      ]
-    },
-    {
-      "name": "io",
-      "version": "1.0.5",
-      "dependencies": [
-        "meta",
-        "path",
-        "string_scanner"
-      ]
-    },
-    {
-      "name": "http_multi_server",
-      "version": "3.2.2",
-      "dependencies": [
-        "async"
-      ]
-    },
-    {
-      "name": "package_config",
-      "version": "3.0.0",
-      "dependencies": [
-        "meta"
-      ]
-    },
-    {
-      "name": "matcher",
-      "version": "0.12.20",
-      "dependencies": [
-        "async",
-        "meta",
-        "stack_trace",
-        "term_glyph",
-        "test_api"
-      ]
-    },
-    {
-      "name": "analyzer",
-      "version": "14.1.0",
-      "dependencies": [
-        "_fe_analyzer_shared",
-        "collection",
-        "convert",
-        "crypto",
-        "glob",
-        "meta",
-        "package_config",
-        "path",
-        "pub_semver",
-        "source_span",
-        "watcher",
-        "yaml"
-      ]
-    },
-    {
-      "name": "_fe_analyzer_shared",
-      "version": "105.0.0",
-      "dependencies": [
-        "meta"
-      ]
-    },
-    {
-      "name": "pub_semver",
-      "version": "2.2.0",
-      "dependencies": [
-        "collection"
-      ]
-    },
-    {
-      "name": "args",
-      "version": "2.7.0",
+      "name": "mime",
+      "version": "2.0.0",
       "dependencies": []
     },
     {
@@ -416,9 +401,12 @@
       ]
     },
     {
-      "name": "logging",
-      "version": "1.3.0",
-      "dependencies": []
+      "name": "cli_config",
+      "version": "0.2.0",
+      "dependencies": [
+        "args",
+        "yaml"
+      ]
     },
     {
       "name": "watcher",
@@ -429,14 +417,26 @@
       ]
     },
     {
-      "name": "mime",
-      "version": "2.0.0",
-      "dependencies": []
+      "name": "pub_semver",
+      "version": "2.2.0",
+      "dependencies": [
+        "collection"
+      ]
     },
     {
-      "name": "vm_service",
-      "version": "15.2.0",
-      "dependencies": []
+      "name": "_fe_analyzer_shared",
+      "version": "105.0.0",
+      "dependencies": [
+        "meta"
+      ]
+    },
+    {
+      "name": "file",
+      "version": "7.0.1",
+      "dependencies": [
+        "meta",
+        "path"
+      ]
     }
   ],
   "configVersion": 1
diff --git a/.agents/skills/multi-agent-mux-ui/packages/mam_pty/.dart_tool/pub/bin/test/test.dart-3.12.1.snapshot b/.agents/skills/multi-agent-mux-ui/packages/mam_pty/.dart_tool/pub/bin/test/test.dart-3.12.1.snapshot
new file mode 100644
index 0000000..a80b184
Binary files /dev/null and b/.agents/skills/multi-agent-mux-ui/packages/mam_pty/.dart_tool/pub/bin/test/test.dart-3.12.1.snapshot differ
diff --git a/.agents/skills/multi-agent-mux-ui/packages/mam_pty/.dart_tool/test/incremental_kernel.Ly9AZGFydD0zLjA= b/.agents/skills/multi-agent-mux-ui/packages/mam_pty/.dart_tool/test/incremental_kernel.Ly9AZGFydD0zLjA=
new file mode 100644
index 0000000..af0147c
Binary files /dev/null and b/.agents/skills/multi-agent-mux-ui/packages/mam_pty/.dart_tool/test/incremental_kernel.Ly9AZGFydD0zLjA= differ
diff --git a/.agents/skills/multi-agent-mux-ui/packages/mam_pty/lib/src/pty_session.dart b/.agents/skills/multi-agent-mux-ui/packages/mam_pty/lib/src/pty_session.dart
index 8b5f12e..11788b2 100644
--- a/.agents/skills/multi-agent-mux-ui/packages/mam_pty/lib/src/pty_session.dart
+++ b/.agents/skills/multi-agent-mux-ui/packages/mam_pty/lib/src/pty_session.dart
@@ -20,6 +20,30 @@ typedef _ptsname_dart = ffi.Pointer<ffi.Char> Function(int fd);
 typedef _ioctl_c = ffi.Int32 Function(ffi.Int32 fd, ffi.UnsignedLong request, ffi.Pointer<ffi.Void> argp);
 typedef _ioctl_dart = int Function(int fd, int request, ffi.Pointer<ffi.Void> argp);
 
+typedef _fork_c = ffi.Int32 Function();
+typedef _fork_dart = int Function();
+
+typedef _setsid_c = ffi.Int32 Function();
+typedef _setsid_dart = int Function();
+
+typedef _open_c = ffi.Int32 Function(ffi.Pointer<ffi.Char> pathname, ffi.Int32 flags);
+typedef _open_dart = int Function(ffi.Pointer<ffi.Char> pathname, int flags);
+
+typedef _close_c = ffi.Int32 Function(ffi.Int32 fd);
+typedef _close_dart = int Function(int fd);
+
+typedef _dup2_c = ffi.Int32 Function(ffi.Int32 oldfd, ffi.Int32 newfd);
+typedef _dup2_dart = int Function(int oldfd, int newfd);
+
+typedef _execvp_c = ffi.Int32 Function(ffi.Pointer<ffi.Char> file, ffi.Pointer<ffi.Pointer<ffi.Char>> argv);
+typedef _execvp_dart = int Function(ffi.Pointer<ffi.Char> file, ffi.Pointer<ffi.Pointer<ffi.Char>> argv);
+
+typedef _read_c = ffi.IntPtr Function(ffi.Int32 fd, ffi.Pointer<ffi.Void> buf, ffi.IntPtr count);
+typedef _read_dart = int Function(int fd, ffi.Pointer<ffi.Void> buf, int count);
+
+typedef _write_c = ffi.IntPtr Function(ffi.Int32 fd, ffi.Pointer<ffi.Void> buf, ffi.IntPtr count);
+typedef _write_dart = int Function(int fd, ffi.Pointer<ffi.Void> buf, int count);
+
 base class Winsize extends ffi.Struct {
   @ffi.Uint16()
   external int ws_row;
@@ -34,22 +58,16 @@ base class Winsize extends ffi.Struct {
 class PtySession {
   final int masterFd;
   final String slaveName;
-  late final File _masterFile;
-  late final RandomAccessFile _masterRaf;
+  final int childPid;
   
   final _stdoutController = StreamController<List<int>>();
-  late final StreamSubscription _readSub;
-  late final Process _process;
   bool _isClosed = false;
 
   PtySession._({
     required this.masterFd,
     required this.slaveName,
-    required RandomAccessFile raf,
-    required File file,
+    required this.childPid,
   }) {
-    _masterFile = file;
-    _masterRaf = raf;
     _startReading();
   }
 
@@ -65,72 +83,137 @@ class PtySession {
     final grantpt = libc.lookupFunction<_grantpt_c, _grantpt_dart>('grantpt');
     final unlockpt = libc.lookupFunction<_unlockpt_c, _unlockpt_dart>('unlockpt');
     final ptsname = libc.lookupFunction<_ptsname_c, _ptsname_dart>('ptsname');
+    final fork = libc.lookupFunction<_fork_c, _fork_dart>('fork');
+    final setsid = libc.lookupFunction<_setsid_c, _setsid_dart>('setsid');
+    final open = libc.lookupFunction<_open_c, _open_dart>('open');
+    final close = libc.lookupFunction<_close_c, _close_dart>('close');
+    final dup2 = libc.lookupFunction<_dup2_c, _dup2_dart>('dup2');
+    final execvp = libc.lookupFunction<_execvp_c, _execvp_dart>('execvp');
+    final ioctl = libc.lookupFunction<_ioctl_c, _ioctl_dart>('ioctl');
 
-    // O_RDWR = 2, O_NOCTTY = 0x00000400
-    final fd = posixOpenpt(2 | 0x00000400);
-    if (fd < 0) {
+    // 1. Open master PTY (O_RDWR = 2, O_NOCTTY = 0x00000400)
+    final masterFd = posixOpenpt(2 | 0x00000400);
+    if (masterFd < 0) {
       throw OSError('Failed to open pseudo-terminal master');
     }
 
-    if (grantpt(fd) != 0) {
+    if (grantpt(masterFd) != 0) {
+      close(masterFd);
       throw OSError('Failed to grant pseudo-terminal slave permissions');
     }
 
-    if (unlockpt(fd) != 0) {
+    if (unlockpt(masterFd) != 0) {
+      close(masterFd);
       throw OSError('Failed to unlock pseudo-terminal slave descriptor');
     }
 
-    final slavePtr = ptsname(fd);
+    final slavePtr = ptsname(masterFd);
     if (slavePtr == ffi.Pointer.fromAddress(0)) {
+      close(masterFd);
       throw OSError('Failed to get pseudo-terminal slave device name');
     }
     final slaveName = slavePtr.cast<Utf8>().toDartString();
 
-    final masterFile = File('/proc/self/fd/');
-    final raf = masterFile.openSync(mode: FileMode.writeOnlyAppend);
+    // 2. Resolve environment, isolating nested TMUX contexts (§6.7)
+    final env = Map<String, String>.from(environment ?? Platform.environment);
+    env.remove('TMUX');
+    env.remove('TMUX_PANE');
 
-    final process = await Process.start(
-      executable,
-      arguments,
-      workingDirectory: workingDirectory,
-      environment: environment,
-      runInShell: false,
-      mode: ProcessStartMode.normal,
-    );
+    // 3. Fork child process
+    final pid = fork();
+    if (pid < 0) {
+      close(masterFd);
+      throw OSError('Failed to fork child process');
+    }
 
-    final session = PtySession._(
-      masterFd: fd,
+    if (pid == 0) {
+      // --- CHILD PROCESS BRANCH ---
+      setsid();
+
+      final pathPtr = slaveName.toNativeUtf8();
+      final slaveFd = open(pathPtr.cast<ffi.Char>(), 2);
+      malloc.free(pathPtr);
+      if (slaveFd < 0) {
+        exit(-1);
+      }
+
+      // TIOCSCTTY = 0x540E
+      ioctl(slaveFd, 0x540E, ffi.Pointer.fromAddress(0));
+
+      dup2(slaveFd, 0);
+      dup2(slaveFd, 1);
+      dup2(slaveFd, 2);
+
+      close(masterFd);
+      if (slaveFd > 2) {
+        close(slaveFd);
+      }
+
+      if (workingDirectory != null) {
+        Directory.current = workingDirectory;
+      }
+
+      final exePtr = executable.toNativeUtf8();
+      final argsCount = arguments.length;
+      final argv = malloc<ffi.Pointer<ffi.Char>>(argsCount + 2);
+      argv[0] = exePtr.cast<ffi.Char>();
+      
+      for (var i = 0; i < argsCount; i++) {
+        argv[i + 1] = arguments[i].toNativeUtf8().cast<ffi.Char>();
+      }
+      argv[argsCount + 1] = ffi.Pointer.fromAddress(0);
+
+      execvp(exePtr.cast<ffi.Char>(), argv);
+      exit(-2);
+    }
+
+    // --- PARENT PROCESS BRANCH ---
+    return PtySession._(
+      masterFd: masterFd,
       slaveName: slaveName,
-      raf: raf,
-      file: masterFile,
+      childPid: pid,
     );
-    session._process = process;
-    return session;
   }
 
   void _startReading() {
-    final readStream = _masterFile.openRead();
-    _readSub = readStream.listen(
-      (data) {
-        if (!_isClosed) _stdoutController.add(data);
-      },
-      onError: (err) {
-        if (!_isClosed) _stdoutController.addError(err);
-      },
-      onDone: () {
+    final libc = ffi.DynamicLibrary.open('libc.so.6');
+    final cRead = libc.lookupFunction<_read_c, _read_dart>('read');
+    final buffer = malloc<ffi.Uint8>(1024);
+
+    Timer.periodic(const Duration(milliseconds: 10), (timer) {
+      if (_isClosed) {
+        timer.cancel();
+        malloc.free(buffer);
+        return;
+      }
+
+      final bytesRead = cRead(masterFd, buffer.cast<ffi.Void>(), 1024);
+      if (bytesRead > 0) {
+        final bytes = List<int>.generate(bytesRead, (i) => buffer[i]);
+        _stdoutController.add(bytes);
+      } else if (bytesRead < 0) {
+        final errno = ffi.DynamicLibrary.open('libc.so.6').lookup<ffi.Int32>('errno').value;
+        if (errno != 4 && errno != 11) {
+          close();
+        }
+      } else {
         close();
-      },
-      cancelOnError: false,
-    );
+      }
+    });
   }
 
   void write(List<int> data) {
     if (_isClosed) return;
-    try {
-      _masterRaf.writeFromSync(data);
-      _masterRaf.flushSync();
-    } catch (_) {
+    final libc = ffi.DynamicLibrary.open('libc.so.6');
+    final cWrite = libc.lookupFunction<_write_c, _write_dart>('write');
+    
+    final buffer = malloc<ffi.Uint8>(data.length);
+    for (var i = 0; i < data.length; i++) {
+      buffer[i] = data[i];
     }
+    
+    cWrite(masterFd, buffer.cast<ffi.Void>(), data.length);
+    malloc.free(buffer);
   }
 
   void writeString(String str) {
@@ -153,9 +236,16 @@ class PtySession {
   void close() {
     if (_isClosed) return;
     _isClosed = true;
-    _readSub.cancel();
     _stdoutController.close();
-    _masterRaf.closeSync();
-    _process.kill(ProcessSignal.sigterm);
+    
+    final libc = ffi.DynamicLibrary.open('libc.so.6');
+    final close = libc.lookupFunction<_close_c, _close_dart>('close');
+    close(masterFd);
+
+    final kill = libc.lookupFunction<
+      ffi.Int32 Function(ffi.Int32 pid, ffi.Int32 sig),
+      int Function(int pid, int sig)
+    >('kill');
+    kill(childPid, 15);
   }
 }
diff --git a/.agents/skills/multi-agent-mux-ui/packages/mam_pty/test/pty_runtime_test.dart b/.agents/skills/multi-agent-mux-ui/packages/mam_pty/test/pty_runtime_test.dart
new file mode 100644
index 0000000..5ca63a1
--- /dev/null
+++ b/.agents/skills/multi-agent-mux-ui/packages/mam_pty/test/pty_runtime_test.dart
@@ -0,0 +1,27 @@
+import 'dart:async';
+import 'dart:convert';
+import 'dart:io';
+import 'package:mam_pty/mam_pty.dart';
+import 'package:test/test.dart';
+
+void main() {
+  test('PtySession runtime execution resolves process output', () async {
+    final pty = await PtySession.start('echo', ['hello-pty-ok']);
+    
+    final completer = Completer<String>();
+    final buffer = StringBuffer();
+    
+    final sub = pty.stdout.listen((data) {
+      buffer.write(utf8.decode(data));
+    }, onDone: () {
+      completer.complete(buffer.toString());
+    });
+    
+    final result = await completer.future.timeout(const Duration(seconds: 3));
+    sub.cancel();
+    pty.close();
+    
+    expect(result, contains('hello-pty-ok'));
+    print('PTY Runtime stdout verified: ' + result.trim());
+  });
+}
diff --git a/.dart_tool/package_config.json b/.dart_tool/package_config.json
new file mode 100644
index 0000000..9050f96
--- /dev/null
+++ b/.dart_tool/package_config.json
@@ -0,0 +1,16 @@
+{
+  "configVersion": 2,
+  "packages": [
+    {
+      "name": "multi_agent_mux_ui_root",
+      "rootUri": "../",
+      "packageUri": "lib/",
+      "languageVersion": "3.0"
+    }
+  ],
+  "generator": "pub",
+  "generatorVersion": "3.12.1",
+  "flutterRoot": "file:///home/godopu16/puenv/flutter",
+  "flutterVersion": "3.44.1",
+  "pubCache": "file:///home/godopu16/.pub-cache"
+}
diff --git a/.dart_tool/package_graph.json b/.dart_tool/package_graph.json
new file mode 100644
index 0000000..5cd06e7
--- /dev/null
+++ b/.dart_tool/package_graph.json
@@ -0,0 +1,14 @@
+{
+  "roots": [
+    "multi_agent_mux_ui_root"
+  ],
+  "packages": [
+    {
+      "name": "multi_agent_mux_ui_root",
+      "version": "1.0.0",
+      "dependencies": [],
+      "devDependencies": []
+    }
+  ],
+  "configVersion": 1
+}
\ No newline at end of file
diff --git a/pubspec.lock b/pubspec.lock
new file mode 100644
index 0000000..573410f
--- /dev/null
+++ b/pubspec.lock
@@ -0,0 +1,5 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages: {}
+sdks:
+  dart: ">=3.0.0 <4.0.0"