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>

packages/TXCore/Tests/TXCoreTests/MoshConnectTests.swift

@@ -0,0 +1,37 @@
+import XCTest
+@testable import TXCore
+
+final class MoshConnectTests: XCTestCase {
+    func testParseBasic() {
+        let info = MoshConnectScanner.parse("MOSH CONNECT 60001 gPFm3s8bkfMGrun5QI0Xdw")
+        XCTAssertEqual(info, MoshConnectInfo(port: 60001, key: "gPFm3s8bkfMGrun5QI0Xdw"))
+    }
+
+    func testParseAmidNoise() {
+        let out = """
+        user@host:~$ mosh-server new -s -c 256\r
+        \r
+        MOSH CONNECT 60022 AbCd1234+/xyzKEY0000==\r
+        \r
+        mosh-server (mosh 1.4.0)\r
+        """
+        let info = MoshConnectScanner.parse(out)
+        XCTAssertEqual(info?.port, 60022)
+        XCTAssertEqual(info?.key, "AbCd1234+/xyzKEY0000==")
+    }
+
+    func testNoMatch() {
+        XCTAssertNil(MoshConnectScanner.parse("bash: mosh-server: command not found"))
+        XCTAssertNil(MoshConnectScanner.parse("MOSH CONNECT notaport keyhere"))
+    }
+
+    func testStreamingAcrossFeeds() {
+        let s = MoshConnectScanner()
+        XCTAssertNil(s.feed("prompt$ mosh-server new\r\nMOSH CON"))
+        XCTAssertNil(s.result)
+        let info = s.feed("NECT 60007 KeyAcrossBoundary123\r\n")
+        XCTAssertEqual(info, MoshConnectInfo(port: 60007, key: "KeyAcrossBoundary123"))
+        // 幂等：后续 feed 不改变结果。
+        XCTAssertEqual(s.feed("MOSH CONNECT 61000 other"), MoshConnectInfo(port: 60007, key: "KeyAcrossBoundary123"))
+    }
+}