feat: xiaohe upgrade + 启动器更名 Xiaohe Agent + CLI 输出全英文

- upgrade: 查版本(install.sh)→确认→rich 进度条下载→落 runtime 切 current(留两版)→重装三件套→自动 sync
- launcher: 'Xiaohe Agent.app' / 'Xiaohe Agent.desktop'，自动清理旧 XiaoheAgent.{command,app,desktop}
- 修复 _current_version 对缺失 current 软链误判为 'current'
- 全部提示/log 英文化；93 tests passed

tests/test_upgrade.py

@@ -0,0 +1,134 @@
+"""Tests for myagents.commands.upgrade."""
+
+import io
+from pathlib import Path
+
+import pytest
+from click.testing import CliRunner
+
+from myagents.commands import upgrade as up_mod
+
+
+@pytest.fixture()
+def fake_home(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> Path:
+    home = tmp_path / "home"
+    home.mkdir()
+    monkeypatch.setattr(Path, "home", staticmethod(lambda: home))
+    return home
+
+
+def _make_runtime(home: Path, version: str) -> Path:
+    target = home / ".xiaohe" / "runtime" / version
+    target.mkdir(parents=True)
+    current = target.parent / "current"
+    current.unlink(missing_ok=True)
+    current.symlink_to(target)
+    return target
+
+
+class TestParseVersion:
+    def test_parses_quoted_version(self) -> None:
+        assert up_mod._parse_version('BASE_URL="x"\nVERSION="v1.2.3"\n') == "v1.2.3"
+
+    def test_returns_none_on_garbage(self) -> None:
+        assert up_mod._parse_version("no version here") is None
+
+
+class TestPrune:
+    def test_keeps_two_newest(self, fake_home: Path) -> None:
+        root = fake_home / ".xiaohe" / "runtime"
+        for name in ("v1", "v2", "v3", "v4"):
+            d = root / name
+            d.mkdir(parents=True)
+        up_mod._prune()
+        remaining = sorted(p.name for p in root.iterdir())
+        assert remaining == ["v3", "v4"]
+
+
+class TestUpgradeCommand:
+    def test_already_latest_shortcircuits(
+        self, fake_home: Path, monkeypatch: pytest.MonkeyPatch
+    ) -> None:
+        _make_runtime(fake_home, "v1.0.0")
+        monkeypatch.setattr(
+            up_mod, "_fetch_text", lambda *a: 'VERSION="v1.0.0"\n'
+        )
+        result = CliRunner().invoke(
+            up_mod.upgrade_cmd, ["--user", "u", "--password", "p"]
+        )
+        assert result.exit_code == 0
+        assert "Already up to date" in result.output
+
+    def test_missing_runtime_errors(self, fake_home: Path) -> None:
+        result = CliRunner().invoke(
+            up_mod.upgrade_cmd, ["--user", "u", "--password", "p"]
+        )
+        assert result.exit_code != 0
+        assert "install.sh" in result.output
+
+    def test_cancelled_by_user(
+        self, fake_home: Path, monkeypatch: pytest.MonkeyPatch
+    ) -> None:
+        _make_runtime(fake_home, "v1.0.0")
+        monkeypatch.setattr(
+            up_mod, "_fetch_text", lambda *a: 'VERSION="v2.0.0"\n'
+        )
+        result = CliRunner().invoke(
+            up_mod.upgrade_cmd, ["--user", "u", "--password", "p"], input="n\n"
+        )
+        assert result.exit_code == 0
+        assert "Cancelled" in result.output
+
+
+class _FakeResponse:
+    def __init__(self, data: bytes) -> None:
+        self.headers = {"Content-Length": str(len(data))}
+        self._buf = io.BytesIO(data)
+
+    def read(self, n: int = -1) -> bytes:
+        return self._buf.read(n)
+
+    def __enter__(self) -> "_FakeResponse":
+        return self
+
+    def __exit__(self, *args: object) -> None:
+        return None
+
+
+class TestFetch:
+    def test_fetch_text_sends_basic_auth(
+        self, monkeypatch: pytest.MonkeyPatch
+    ) -> None:
+        seen: dict[str, str] = {}
+
+        def fake_urlopen(req, timeout=0):
+            seen["auth"] = req.headers["Authorization"]
+            return _FakeResponse(b"hello")
+
+        monkeypatch.setattr("urllib.request.urlopen", fake_urlopen)
+        assert up_mod._fetch_text("http://x/", "u", "p") == "hello"
+        assert seen["auth"].startswith("Basic ")
+
+    def test_401_maps_to_friendly_error(
+        self, monkeypatch: pytest.MonkeyPatch
+    ) -> None:
+        import urllib.error
+
+        def fake_urlopen(req, timeout=0):
+            raise urllib.error.HTTPError("http://x/", 401, "Unauthorized", {}, None)
+
+        monkeypatch.setattr("urllib.request.urlopen", fake_urlopen)
+        with pytest.raises(Exception, match="401"):
+            up_mod._fetch_text("http://x/", "u", "p")
+
+    def test_download_writes_file(
+        self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch
+    ) -> None:
+        payload = b"x" * 100_000
+        monkeypatch.setattr(
+            "urllib.request.urlopen",
+            lambda req, timeout=0: _FakeResponse(payload),
+        )
+        dest = tmp_path / "out.tar.gz"
+        up_mod._download("http://x/f", "u", "p", dest)
+        assert dest.read_bytes() == payload