Bolts SmartExecBridge into the flight's scan loop behind UV_SMART_EXEC (default off). Fully
lazy: flag off => smart_bridge is never imported and the naive maybe_promote runs unchanged
(verified: runner import does not load smart_bridge when the flag is unset). Flag on =>
entries rest as PostOnly GTX makers, exits stay MARKET, the 6s tick drives TTL-abandon.
Reuses bridge.gate (two-man rule) + bridge.stats. runner.py compiles; wire import-safe both
paths. This is the 'bolt to flight 5/6' — dormant until an operator flips the flag and restarts.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>