fix: use working clones for git repos

- Create normal working clones for remote repositories
- Initialize blank repositories with a main branch
- Align pull and branch helpers with unborn HEAD handling
- Gate fetch/pull on repositories with a remote

Quality gates: vitest repositories-settings-tab (passed); api pytest blocked by missing fastapi in environment

apps/api/tests/integration/test_git_control.py

@@ -63,6 +63,13 @@ class TestGitStatus:
         assert "new.py" in status.untracked
 
 
+def test_get_current_branch_handles_unborn_main() -> None:
+    with tempfile.TemporaryDirectory() as tmpdir:
+        os.system(f"git init -b main {tmpdir} >/dev/null 2>&1")
+
+        assert get_current_branch(tmpdir) == "main"
+
+
 class TestBranchOperations:
     """Tests for branch management functions."""
 

apps/api/tests/unit/test_git_repository_working_clones.py

@@ -0,0 +1,46 @@
+from unittest.mock import Mock, patch
+
+import pytest
+from fastapi import HTTPException
+
+from src.api.git_repositories import _clone_working_repository, _init_working_repository
+
+
+def test_clone_working_repository_uses_normal_clone() -> None:
+    completed = Mock(returncode=0, stderr="")
+    with patch("src.api.git_repositories.subprocess.run", return_value=completed) as run_mock:
+        _clone_working_repository("git@git.commumedia.org:alice/demo.git", "/tmp/demo.git")
+
+    run_mock.assert_called_once()
+    assert run_mock.call_args.args[0] == ["git", "clone", "git@git.commumedia.org:alice/demo.git", "/tmp/demo.git"]
+
+
+def test_clone_working_repository_raises_on_failure() -> None:
+    completed = Mock(returncode=128, stderr="fatal: repository not found")
+    with patch("src.api.git_repositories.subprocess.run", return_value=completed):
+        with pytest.raises(HTTPException) as exc_info:
+            _clone_working_repository("git@git.commumedia.org:alice/missing.git", "/tmp/missing.git")
+
+    assert exc_info.value.status_code == 400
+    assert "failed to clone repository" in exc_info.value.detail
+
+
+def test_init_working_repository_prefers_init_b() -> None:
+    init_b = Mock(returncode=0, stderr="")
+    with patch("src.api.git_repositories.subprocess.run", return_value=init_b) as run_mock:
+        _init_working_repository("/tmp/new-repo")
+
+    assert run_mock.call_args.args[0] == ["git", "init", "-b", "main", "/tmp/new-repo"]
+
+
+def test_init_working_repository_falls_back_to_symbolic_ref() -> None:
+    init_b = Mock(returncode=1, stderr="unknown switch `b'")
+    init_ok = Mock(returncode=0, stderr="")
+    symbolic_ref = Mock(returncode=0, stderr="")
+
+    with patch("src.api.git_repositories.subprocess.run", side_effect=[init_b, init_ok, symbolic_ref]) as run_mock:
+        _init_working_repository("/tmp/new-repo")
+
+    assert run_mock.call_args_list[0].args[0] == ["git", "init", "-b", "main", "/tmp/new-repo"]
+    assert run_mock.call_args_list[1].args[0] == ["git", "init", "/tmp/new-repo"]
+    assert run_mock.call_args_list[2].args[0] == ["git", "-C", "/tmp/new-repo", "symbolic-ref", "HEAD", "refs/heads/main"]