- Added is_circuit_tripped(), trip_circuit(), half_open_probe() functions - Filters out models with tripped circuits in route() function - Trips circuit on 502/504 errors in chat() function - Added /metrics/circuit-breaker endpoint for visibility (Abba suggestion) - Prevents hung GPU cascades (Node #480 scenario) Signed-off-by: Mumuni <mumuni@sysloggh.com>