Function compile_straightline_with 

pub fn compile_straightline_with(
    ops: &[MicroOp],
    shared_status: Option<Arc<AtomicI64>>,
) -> Result<CompiledChain, JitCompileError>

compile_straightline with a caller-supplied (per-program) status cell, so every chain of one program — and the call stencils between them — share a single side-exit channel. The cell’s address is what MicroOp::Call::status_addr must carry.