Addresses feedback on PR #53 regarding an empty except ImportError: pass clause with no explanation in _discover_plugins().

Changes

• Added comment explaining why ImportError is caught and ignored: handles cases where solvers package is unavailable (minimal install, missing dependencies, corrupted package)
• Plugin lookup subsequently fails with helpful KeyError listing available plugins
• Updated .gitignore to exclude Python build artifacts (*.egg-info/, dist/)

def _discover_plugins() -> None:
    """Load built-in plugins by importing the solvers package."""
    try:
        import stdface.solvers  # triggers auto-registration
    except ImportError:
        # Solvers package not available (e.g., minimal install, missing
        # dependencies, or corrupted package). Plugin lookup will fail
        # with a helpful KeyError listing available plugins.
        pass

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