- Add plan-orchestrator.ts with parallel subagent spawning
- Phase 1: 4 specialist subagents analyze in parallel (requirements, architecture, testing, risks)
- Phase 2: Synthesis merges and deduplicates outputs
- Phase 3: Verification subagent assigns priorities and identifies gaps
- New /api/generate-plan-detailed endpoint with SSE progress updates
- Auto-regenerate plan when switching between Standard/Enhanced modes
- Show quality score, warnings, and gaps from verification
- Rename "Detailed" to "Enhanced" button with tooltip
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>