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Remove the scope system end-to-end (llm_models.scope column, agent meta scope field, scope-based tier in model selection, UI checkboxes/pills): it was only a soft ranking hint, had drifted (6 UI scopes vs 3 used by agents, 'general' not even selectable) and duplicated what strength already decides. Strength stays the single AUTO-selection axis. Compaction: the summary model is now pickable from the Settings page via a new PropertyType::LlmModel config property (registry key compaction_model), instance-wide and live (no restart). Fallback chain: explicit pick -> compaction.strength from config.yml -> priority order; a deleted configured model degrades to AUTO. ContextCompactor reads the key at compact time through GlobalConfigManager.