fix: remove slow system git build dependency

tests/test_agent_entrypoint.py

@@ -40,6 +40,12 @@ class HostedAgentEntrypointTests(unittest.TestCase):
         self.assertFalse(readiness["ready"])
         self.assertEqual("state_sync_unhealthy", readiness["reason"])
 
+    def test_runtime_image_uses_python_git_client_without_apt_layer(self) -> None:
+        dockerfile = (ROOT_DIR / "Dockerfile").read_text(encoding="utf-8")
+        requirements = (ROOT_DIR / "requirements.txt").read_text(encoding="utf-8")
+        self.assertNotIn("apt-get", dockerfile)
+        self.assertIn("dulwich", requirements.casefold())
+
 
 if __name__ == "__main__":
     unittest.main()

tests/test_super_agent.py

@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-import subprocess
 import tempfile
 import unittest
 from datetime import datetime, timezone
@@ -9,6 +8,8 @@ from unittest.mock import patch
 
 import sys
 
+from dulwich import porcelain
+
 ROOT = Path(__file__).resolve().parents[1]
 MODULE_ROOT = ROOT / "modelhub_submmit_api"
 if str(MODULE_ROOT) not in sys.path:
@@ -20,7 +21,6 @@ from hf_discovery import HuggingFaceDiscovery, parse_model_card_front_matter  #
 from official_capabilities import OfficialCapabilityRegistry  # noqa: E402
 from routing_engine import SuccessFirstRoutingEngine  # noqa: E402
 from state_sync import StateGitSync  # noqa: E402
-from state_sync import StateSyncError  # noqa: E402
 
 
 class OfficialClient:
@@ -139,7 +139,7 @@ class SuperAgentTests(unittest.TestCase):
             restored_project = root / "restored"
             project.mkdir()
             restored_project.mkdir()
-            subprocess.run(["git", "init", "--bare", str(remote)], check=True, stdout=subprocess.DEVNULL)
+            porcelain.init(remote, bare=True)
             write_json(project / ".modelhub_state" / "account_capacity.json", {"version": 1})
             credentials = {"username": "tester", "email": "tester@example.com", "password": "secret-value"}
             manager = StateGitSync(
@@ -208,19 +208,6 @@ class SuperAgentTests(unittest.TestCase):
                     )
                 )
 
-    def test_missing_git_has_actionable_state_sync_error(self) -> None:
-        with tempfile.TemporaryDirectory() as temporary_dir:
-            manager = StateGitSync(
-                project_root=Path(temporary_dir),
-                credentials={"username": "u", "email": "e@example.com", "password": "p"},
-                remote="unused",
-                log_fn=lambda _: None,
-            )
-            with patch("state_sync.subprocess.run", side_effect=FileNotFoundError("git")):
-                with self.assertRaisesRegex(StateSyncError, "rebuild the service image"):
-                    manager._git("version")
-            manager.close()
-
     def test_config_patch_requires_repeated_cross_model_success(self) -> None:
         with tempfile.TemporaryDirectory() as temporary_dir:
             root = Path(temporary_dir)