chore: import upstream snapshot with attribution

tests/test_branch_numbering.py

@@ -0,0 +1,24 @@
+"""
+Unit tests verifying --branch-numbering removal (v0.10.0).
+
+Branch numbering is now managed entirely by the git extension's config.
+The --branch-numbering flag was removed from `specify init`.
+"""
+
+from pathlib import Path
+
+
+class TestBranchNumberingFlagRemoved:
+    """--branch-numbering flag was removed in v0.10.0."""
+
+    def test_branch_numbering_flag_is_rejected(self, tmp_path: Path):
+        from typer.testing import CliRunner
+        from specify_cli import app
+
+        runner = CliRunner()
+        result = runner.invoke(app, [
+            "init", str(tmp_path / "proj"), "--integration", "claude",
+            "--branch-numbering", "sequential", "--ignore-agent-tools",
+        ])
+        assert result.exit_code != 0, "--branch-numbering should be rejected"
+        assert "No such option" in result.output or "no such option" in result.output.lower()