test(mcp): validate install_mcp OSError path exits with code 1

[Copilot]

PR #3 added a test for the OSError handling branch in install_mcp() but used a brittle string-suffix check to target the config file. Applied the PR with one improvement.

Changes

• tests/test_codeclaw_cli_mcp.py
  • Added import pytest (required for pytest.raises)
  • Added test_install_mcp_handles_read_oserror: monkeypatches Path.read_text to raise OSError for the specific config path and asserts SystemExit(1)
  • Fixed path matching from str(self).endswith("mcp.json") → self == config_path to prevent false matches on unrelated files

def mock_read_text(self, *args, **kwargs):
    if self == config_path:          # precise: was str(self).endswith("mcp.json")
        raise OSError("Fake OS Error")
    return original_read_text(self, *args, **kwargs)

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