Fix: Finalize isolation and continuity boost adjustments

Fix: placeholder search fallback, tighten loop detection, improve LSTM topic extraction and conditional injection

fix: context role labels + short answer heuristic for reply detection

feat: enhance proactive triggers and maximize LSTM context injection

feat: MAC Drive System + proactive mode + agent_timeout fix

refactor: remove ALL emojis from Akira system prompt, thinking engine, and all LLM-facing modules

fix: lock timeout 30s + training worker + PostgreSQL setup