Multi-pass review of recent work to catch errors, gaps, and improvements. Use when the user invokes /cyw, or asks to 'check your work', 'review what you just did', 'is this correct/complete?', 'what's missing?', 'what needs fixing?'. Runs a structured 3-phase loop: critical review, fix, verify. Repeats up to 3 times, stopping early when no issues remain. Supports an embedded single-pass mode (argument: single-pass) for use inside phase gates.
