Two-layer IBKR connectivity validation: direct ibapi handshake + broker-gateway gRPC health check. Pure-client architecture using ibapi as optional dep on fxt (not trading_engine). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Two-layer IBKR connectivity validation: direct ibapi handshake + broker-gateway gRPC health check. Pure-client architecture using ibapi as optional dep on fxt (not trading_engine). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>