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/WORKSPACE

@@ -0,0 +1,31 @@
+workspace(name = "com_google_protobuf_examples")
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+# This com_google_protobuf repository is required for proto_library rule.
+# It provides the protocol compiler binary (i.e., protoc).
+#
+# We declare it as local_repository so we can test changes
+# before they get merged. You'll want to use the following instead:
+#
+# http_archive(
+#     name = "com_google_protobuf",
+#     strip_prefix = "protobuf-main",
+#     urls = ["https://github.com/protocolbuffers/protobuf/archive/main.zip"],
+# )
+local_repository(
+    name = "com_google_protobuf",
+    path = "..",
+)
+
+# Similar to com_google_protobuf but for Java lite. If you are building
+# for Android, the lite version should be preferred because it has a much
+# smaller code size.
+local_repository(
+    name = "com_google_protobuf_javalite",
+    path = "..",
+)
+
+load("@com_google_protobuf//:protobuf_deps.bzl", "protobuf_deps")
+
+protobuf_deps()