Fix C++ engine buy/sell and add Optiq actor stages to Message Flow

Add crash diagnostics: show eunex_me log output on startup failure

Auto-start eunex_me when toggling C++ engine mode

Fix deadlock in CppEngineBridge causing Server not ready on HF Spaces

Fix JSON parse errors when server not ready (HF Spaces startup race)

v0.9.5: Engine mode switch — Python or C++ matching engine

v0.9.3: Add .env config, auto-load env vars in shared/config.py

v0.9.2: Auto-discover HF_TOKEN from cache, fix LLM provider logging

v0.9.1: Fix Ollama integration, thin volume bars, model selector with health check

v0.9.0: Interactive message flow, split price/volume chart, LLM trading strategy

v0.8.0: AI Market Analyst and Developer Message Flow Visualizer

v0.7.0: Daily close persistence, ticker tape, OHLCV candlestick chart

v0.6.1: Market simulation with realistic prices

v0.3.0: FIX gateway, Clearing House with AI traders, enhanced dashboard

v0.2.0: Multi-threaded actor engine, Kafka persistence, web dashboard