fix: correct nullable resolved directory annotation (#3771)

Assisted-by: GitHub Copilot (model: GPT-5.6 Sol, autonomous)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: marcelsafin

src/specify_cli/agents.py

@@ -599,7 +599,7 @@ def register_commands(
         source_dir: Path,
         project_root: Path,
         context_note: Optional[str] = None,
-        _resolved_dir: Path = None,
+        _resolved_dir: Optional[Path] = None,
         link_outputs: bool = False,
         extension_id: Optional[str] = None,
     ) -> List[str]:

tests/test_agent_config_consistency.py

@@ -2,10 +2,12 @@
 
 import re
 from pathlib import Path
+from typing import get_args, get_type_hints
 
 import yaml
 
 from specify_cli import AGENT_CONFIG
+from specify_cli.agents import CommandRegistrar as AgentCommandRegistrar
 from specify_cli.extensions import CommandRegistrar
 
 REPO_ROOT = Path(__file__).resolve().parent.parent
@@ -104,6 +106,14 @@ def _supported_agent_names_from_agent_request_template() -> list[str]:
 class TestAgentConfigConsistency:
     """Ensure agent configuration stays synchronized across key surfaces."""
 
+    def test_register_commands_resolved_dir_annotation_accepts_none(self):
+        """The internal resolved-directory override defaults to None."""
+        resolved_dir_type = get_type_hints(
+            AgentCommandRegistrar.register_commands
+        )["_resolved_dir"]
+
+        assert type(None) in get_args(resolved_dir_type)
+
     def test_issue_template_agent_lists_match_runtime_integrations(self):
         """GitHub issue templates should list all concrete built-in agents."""
         concrete_agent_keys = set(AGENT_CONFIG) - {"generic"}