v0.3.1

Fixed

• PowerShell download-cradle flow. The PowerShell frontend now establishes
  the network→code-execution flow through a pipeline, so a fetch piped into a
  code-execution sink (Invoke-WebRequest … | Invoke-Expression, curl … | iex)
  is reported as a cradle flow exactly like its bash counterpart. Pipeline
  stages now carry a shared group id so the lowerer can key the flow on the
  value flow between stages — never on the mere co-occurrence of a NetEgress
  and a code-execution sink — and the sink CodeExec is marked with the
  additive netFlow: cradle role.