Function emit_fabric_pipelined_verilog 

pub fn emit_fabric_pipelined_verilog(
    name: &str,
    n_in: usize,
    ops: &[FabricOp],
    sched: &PipelineSchedule,
) -> String

Emit the scheduled residual as a pipeline: module fabric_{name} with ports clk, in0.., and the registered result. Every assignment is its own net, so no operator’s signedness leaks into another’s.