feat: add refactoring label bypass for check_pr_size

PRs with the 'refactoring' label bypass the PR size check, allowing
large but legitimate refactoring PRs. The check_pr_size CLI now accepts
--repo and --pr-number to query PR labels via the Gitea API.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

tests/unit/test_check_pr_size.py

@@ -8,6 +8,7 @@ from devx.ci.check_pr_size import (
     check_size,
     cli,
     get_diff_stats,
+    has_refactoring_label,
     is_excluded,
 )
 
@@ -130,3 +131,39 @@ class TestCli:
         result = runner.invoke(cli, ["--base", "origin/master", "--head", "HEAD", "--max-lines", "500"])
         assert result.exit_code != 0
         assert "600" in result.output
+
+    @patch("devx.ci.check_pr_size.subprocess.run")
+    @patch("devx.ci.check_pr_size.has_refactoring_label", return_value=True)
+    def test_bypasses_with_refactoring_label(self, mock_label: MagicMock, mock_run: MagicMock) -> None:
+        mock_run.return_value = MagicMock(
+            returncode=0,
+            stdout="300\t300\tsrc/main.py\n",
+            stderr="",
+        )
+        runner = CliRunner()
+        result = runner.invoke(
+            cli,
+            ["--base", "origin/master", "--head", "HEAD", "--repo", "owner/repo", "--pr-number", "42"],
+        )
+        assert result.exit_code == 0
+        assert "bypassed" in result.output.lower()
+
+
+class TestHasRefactoringLabel:
+    @patch("devx.ci.check_pr_size.GiteaClient")
+    @patch("devx.ci.check_pr_size.get_ci_token", return_value="fake-token")
+    def test_returns_true_when_label_present(self, mock_token: MagicMock, mock_client_cls: MagicMock) -> None:
+        mock_client = mock_client_cls.return_value
+        mock_client.get_pr.return_value = {"labels": [{"name": "refactoring"}, {"name": "bug"}]}
+        assert has_refactoring_label("owner/repo", 42) is True
+
+    @patch("devx.ci.check_pr_size.GiteaClient")
+    @patch("devx.ci.check_pr_size.get_ci_token", return_value="fake-token")
+    def test_returns_false_when_label_absent(self, mock_token: MagicMock, mock_client_cls: MagicMock) -> None:
+        mock_client = mock_client_cls.return_value
+        mock_client.get_pr.return_value = {"labels": [{"name": "bug"}]}
+        assert has_refactoring_label("owner/repo", 42) is False
+
+    @patch("devx.ci.check_pr_size.get_ci_token", side_effect=Exception("no token"))
+    def test_returns_false_on_error(self, mock_token: MagicMock) -> None:
+        assert has_refactoring_label("owner/repo", 42) is False