External code review found 8 regressions introduced by the 14 rapid-fire commits that tried to fix benchmark extraction stalls. All 8 are now fixed.

Fixed (Critical)

• /extract endpoint now loops through ALL batches instead of processing one batch and stopping
• Batch fallback facts use real embedding vectors instead of empty [] (was crashing on vector(1536) column)

Fixed (High)

• Preference-only memories keep their fallback fact_unit so they stay discoverable in fact search
• Entity graph builds automatically after extraction (no more dead graph retrieval)
• fireAndForgetExtraction uses AbortController to cancel zombie extractions on timeout

Fixed (Medium)

• Fact-based recall now applies scope, tags, and date filters (was ignoring all caller filters)
• Causal relations from GPT extraction are persisted to fact_links table (graph traversal can use them)
• Dead code cleanup: removed unused factEntityMap variable and consolidateObservations import