feat: 完成 M2 mosh（LAN + tsnet 端到端验证）

- mosh(blinksh/ios C++)+protobuf-lite 交叉编译为 MoshCore.xcframework
  （CommonCrypto 后端、含 arm64 模拟器 slice；绕 autotools 用 CMake 直编 + 手写 config.h）
- tsnet 桥新增 UDP relay（StartMoshRelay：loopback↔tsnet.Dial 逐包搬运）
- MoshSession（pipe↔FILE*/pthread/SIGWINCH）+ MoshConnectScanner（TXCore，+4 单测=39）
- SSHTerminalModel 编排：SSH 引导 mosh-server→解析 MOSH CONNECT→relay→mosh 接管
- LAN 直连 + mosh-over-tsnet 均端到端验证通过，R1(tsnet UDP 数据报语义) 证伪

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

vendor/protobuf/examples/list_people.py

@@ -0,0 +1,40 @@
+#! /usr/bin/env python
+
+# See README.txt for information and build instructions.
+
+from __future__ import print_function
+import addressbook_pb2
+import sys
+
+
+# Iterates though all people in the AddressBook and prints info about them.
+def ListPeople(address_book):
+  for person in address_book.people:
+    print("Person ID:", person.id)
+    print("  Name:", person.name)
+    if person.email != "":
+      print("  E-mail address:", person.email)
+
+    for phone_number in person.phones:
+      if phone_number.type == addressbook_pb2.Person.MOBILE:
+        print("  Mobile phone #:", end=" ")
+      elif phone_number.type == addressbook_pb2.Person.HOME:
+        print("  Home phone #:", end=" ")
+      elif phone_number.type == addressbook_pb2.Person.WORK:
+        print("  Work phone #:", end=" ")
+      print(phone_number.number)
+
+
+# Main procedure:  Reads the entire address book from a file and prints all
+#   the information inside.
+if len(sys.argv) != 2:
+  print("Usage:", sys.argv[0], "ADDRESS_BOOK_FILE")
+  sys.exit(-1)
+
+address_book = addressbook_pb2.AddressBook()
+
+# Read the existing address book.
+with open(sys.argv[1], "rb") as f:
+  address_book.ParseFromString(f.read())
+
+ListPeople(address_book)