fix: use correct module name in find_spec for MONTY_AVAILABLE

[Copilot]

importlib.util.find_spec expects the importable Python module name (underscores), not the pip package name (hyphens). Using "pydantic-monty" caused find_spec to always return None, so MONTY_AVAILABLE was always False and the Monty executor path never activated — even when the package was installed.

Change

# Before — always False regardless of installation
MONTY_AVAILABLE = bool(importlib.util.find_spec("pydantic-monty"))

# After — correctly detects installed package
MONTY_AVAILABLE = bool(importlib.util.find_spec("pydantic_monty"))

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