fix(update): avoid source-building uv on Termux

tests/hermes_cli/test_cmd_update.py

@@ -109,6 +109,36 @@ class TestCmdUpdatePip:
         assert "env" not in mock_run.call_args.kwargs
 
 
+class TestCmdUpdateTermuxUvBootstrap:
+    """Regression tests for Termux-specific uv bootstrap behavior."""
+
+    @patch("shutil.which", return_value=None)
+    @patch("subprocess.run")
+    def test_termux_uv_bootstrap_uses_binary_only_install(
+        self, mock_run, _mock_which, monkeypatch
+    ):
+        from hermes_cli import main as hm
+
+        mock_run.return_value = subprocess.CompletedProcess([], 1, stdout="", stderr="")
+        monkeypatch.setattr(hm, "_is_termux_env", lambda env=None: True)
+
+        uv_bin = hm._ensure_uv_for_termux(["/termux/python", "-m", "pip"])
+
+        assert uv_bin is None
+        assert mock_run.call_count == 1
+        assert mock_run.call_args.args[0] == [
+            "/termux/python",
+            "-m",
+            "pip",
+            "install",
+            "uv",
+            "--only-binary",
+            ":all:",
+        ]
+        assert mock_run.call_args.kwargs["cwd"] == PROJECT_ROOT
+        assert mock_run.call_args.kwargs["check"] is False
+
+
 class TestCmdUpdateBranchFallback:
     """cmd_update falls back to main when current branch has no remote counterpart."""