fix: correct nullable resolved directory annotation

[marcelsafin]

Description

CommandRegistrar.register_commands() accepts None for its internal
_resolved_dir override, but annotated the parameter as Path. This corrects
the type contract to Optional[Path], matching the existing default and nearby
optional parameters. Runtime behavior is unchanged.

The regression test resolves the runtime type hints and verifies that
_resolved_dir accepts None.

Testing

• Tested locally with uv run specify --help
• Ran existing tests with uv sync && uv run pytest
• Tested with a sample project (if applicable)

Full suite: 5422 passed, 172 skipped.

AI Disclosure

• I did not use AI assistance for this contribution
• I did use AI assistance (describe below)

GitHub Copilot (GPT-5.6 Sol) autonomously identified, implemented, tested, and
self-reviewed this change on behalf of @marcelsafin.

[Copilot]

Pull request overview

Corrects CommandRegistrar.register_commands() typing to reflect its existing nullable default; runtime behavior is unchanged.

Changes:

• Annotates _resolved_dir as Optional[Path].
• Adds a regression test verifying the resolved type accepts None.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/specify_cli/agents.py	Corrects the nullable parameter annotation.
tests/test_agent_config_consistency.py	Tests the corrected type contract.

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