Subagents can't spawn subagents. The command itself orchestrates: - Wave 1: Spawn gsd-verifier per phase (parallel) - Wave 2: Spawn gsd-integration-checker - Aggregate results into MILESTONE-AUDIT.md Remove gsd-milestone-auditor agent (command does this now). Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>