ConfigManager._load_yaml_config returned yaml.safe_load(...) or {}, which
only guards falsy roots — a truthy non-mapping root (a YAML list or
scalar) flows straight into _merge_configs, whose .items() raises
AttributeError. get_config()/has_value()/get_value() then crash, and via
should_execute_hook's blanket 'except Exception: return False' every
config-based hook condition for that extension is silently disabled.
Coerce a non-dict root to {}, mirroring the existing non-dict-root guard
in get_project_config(). Hardens all three call sites in one place.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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