Stack Mode Shared contract for commands that need to operate across a whole stack of dependent PRs in one invocation. Used by and . The goal is one simple thing: when a PR is part of a stack targeting a common base branch, loop the command's normal workflow across every PR in the stack in base-to-tip order and emit one consolidated summary on the stack root. When to Use Load this skill when a command accepts a flag (or auto-detects stack membership) and needs to iterate its normal workflow across multiple PRs. Do NOT load this skill for single-PR workflows. The per-PR workflow stays unchanged…