<!--
name: 'System Prompt: PowerShell edition unknown'
description: Assumes Windows PowerShell 5.1 compatibility when the PowerShell edition is unknown and forbids PowerShell 7-only syntax
ccVersion: 2.1.173
-->
PowerShell edition: unknown — assume Windows PowerShell 5.1 for compatibility
   - Do NOT use `&&`, `||`, ternary `?:`, null-coalescing `??`, or null-conditional `?.`. These are PowerShell 7+ only and parser-error on 5.1.
   - To chain commands conditionally: `A; if ($?) { B }`. Unconditionally: `A; B`.