feat(git proxy): start 默认写 git http(s).proxy，stop 自动恢复，restart 继承状态（CI 用 --no-set-git）

tests/test_git_proxy.py

@@ -1,6 +1,6 @@
 """Unit tests for git proxy helpers."""
 
-from mytoolkit.commands.git import _proxy_loopback_port
+from mytoolkit.commands.git import _proxy_loopback_port, _restore_baseline
 
 
 def test_proxy_loopback_port_http():
@@ -13,6 +13,18 @@ def test_proxy_loopback_port_rejects_remote():
     assert _proxy_loopback_port("socks5://127.0.0.1:1080") is None
 
 
+def test_restore_baseline_daemon_own_port_becomes_unset():
+    # Git already pointing at the daemon's loopback port → treat as no proxy.
+    assert _restore_baseline("http://127.0.0.1:38457", 38457) == "(not set)"
+    assert _restore_baseline("http://localhost:38457", 38457) == "(not set)"
+
+
+def test_restore_baseline_foreign_values_pass_through():
+    assert _restore_baseline("http://127.0.0.1:10080", 38457) == "http://127.0.0.1:10080"
+    assert _restore_baseline("(not set)", 38457) == "(not set)"
+    assert _restore_baseline("http://127.0.0.1:38457", None) == "http://127.0.0.1:38457"
+
+
 def test_procs_matching_filters_by_command():
     from mytoolkit.commands.git import _procs_matching
     import os