Adds validation of epic structure for swarm execution:
- Computes ready fronts (waves of parallel work)
- Detects structural issues (cycles, orphans, missing deps)
- Reports estimated worker-sessions and max parallelism
- Warns about potential dependency inversions
- Returns exit code for CI integration
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
