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/ruby/BUILD.bazel

@@ -0,0 +1,34 @@
+# Protobuf Ruby runtime
+#
+# See also code generation logic under /src/google/protobuf/compiler/ruby.
+
+load("@rules_pkg//:mappings.bzl", "pkg_files", "strip_prefix")
+
+pkg_files(
+    name = "dist_files",
+    srcs = glob([
+        "compatibility_tests/v3.0.0/**/*",
+        "ext/google/protobuf_c/*",
+        "src/main/java/com/google/protobuf/jruby/*.java",
+        "tests/*.proto",
+        "tests/*.rb",
+    ]) + [
+        ".gitignore",
+        "BUILD.bazel",
+        "Gemfile",
+        "README.md",
+        "Rakefile",
+        "google-protobuf.gemspec",
+        "lib/google/protobuf.rb",
+        "lib/google/protobuf/descriptor_dsl.rb",
+        "lib/google/protobuf/message_exts.rb",
+        "lib/google/protobuf/repeated_field.rb",
+        "lib/google/protobuf/well_known_types.rb",
+        "pom.xml",
+        "src/main/java/google/ProtobufJavaService.java",
+        "src/main/sentinel.proto",
+        "travis-test.sh",
+    ],
+    strip_prefix = strip_prefix.from_root(""),
+    visibility = ["//pkg:__pkg__"],
+)