Add toCoord/cloneVec3 helpers, return structured telemetry from goToPlayer/goToCoordinate with ok/startPos/endPos/movedDistance/distanceToTargetBefore/distanceToTargetAfter fields, track lastPlannerOutcome summary (actionCount/okCount/errorCount/returnValue/logs) in Brain and inject as [SCRIPT] context with truncation, implement expect/expectMoved/expectNear guardrail tools in JavaScriptPlanner to validate action