Run an adversarial, multi-reviewer code review of a diff using pi subagents, then apply the valid fixes yourself. Use whenever the user asks to review code or a change — "review this PR", "review our/the code", "review your work so far", "double check the code", "check my work", "look over this", "any bugs in this?", "sanity check this" — or when finalizing a non-trivial change. Requires pi-subagents.
