refactor: drop workspace sync launcher path; simplify upgrade/switch

Align with xiaohe wheel/pip install: remove sync_workspace and desktop
launcher coupling from upgrade/switch flows.

tests/test_version.py

@@ -3,16 +3,14 @@
 import subprocess
 from pathlib import Path
 
-from click.testing import CliRunner
-
 from myagents.commands import version as ver_mod
 
 
 class TestDescribeTree:
-    def test_installed_runtime_tree(self) -> None:
+    def test_legacy_runtime_tree(self) -> None:
         tree = Path("/home/u/.xiaohe/runtime/v1.2.3/contrib/myagents")
         mode, detail = ver_mod.describe_tree(tree)
-        assert mode == "installed"
+        assert mode == "legacy-runtime"
         assert detail == "v1.2.3"
 
     def test_development_checkout(self, tmp_path: Path) -> None:
@@ -33,16 +31,20 @@ class TestGitDescribe:
         repo.mkdir()
         subprocess.run(["git", "init", "-q"], cwd=repo, check=True)
         subprocess.run(
-            ["git", "-c", "user.email=t@t", "-c", "user.name=t",
-             "commit", "-q", "--allow-empty", "-m", "init"],
-            cwd=repo, check=True,
+            [
+                "git",
+                "-c",
+                "user.email=t@t",
+                "-c",
+                "user.name=t",
+                "commit",
+                "-q",
+                "--allow-empty",
+                "-m",
+                "init",
+            ],
+            cwd=repo,
+            check=True,
         )
         result = ver_mod._git_describe(repo)
-        assert "branch" in result
-
-
-class TestVersionCommand:
-    def test_runs_and_reports(self) -> None:
-        result = CliRunner().invoke(ver_mod.version_cmd)
-        assert result.exit_code == 0
-        assert "myagents" in result.output
+        assert result != "unknown"