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- Pattern Lab: "Find Matching" button per pattern uses GPT-4o-mini to classify against library (merge_as_instance / counter_scenario / new_pattern); shows match badge + confidence + suggested #regime_tag; conditional action buttons (Merge / Save counter / Save new) - save_pattern_from_run handles action='instance' (appends to historical_instances + updates stats), action='counter' (new pattern with counter_of link, tags parent regime_tag), action='new' (unchanged + regime_tag support) - useApi.ts: extended useSaveLabPattern type + new useFindMatchingPattern mutation + MatchResult export type - DB migrations: regime_tag + counter_of columns on custom_patterns - PatternExplorer: new "By Regime" view groups saved patterns by regime_tag; RegimeCard shows historical instances, hit rate, counter-of link (orange); untagged group at bottom Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>