docs: add enterprise GitHub Issues integration plan
Comprehensive plan for transforming BMAD into enterprise team coordination
platform supporting 5-15 parallel developers.
Key features:
- Story-level locking (prevents duplicate work)
- Smart cache (97% API reduction, 27x faster reads)
- Real-time progress visibility for Product Owners
- GitHub Issues as source of truth
- Zero merge conflicts through centralized coordination
Implementation: 6-8 weeks for complete system, 4-6 weeks for MVP
Risk: Low-Medium (building on proven migrate-to-github patterns)
ROI: Eliminates duplicate work, 40% PO-Dev friction reduction
Plan includes:
- 3-tier architecture (GitHub + Cache + Git)
- 4 implementation phases
- 26 new files, 5 modified files (~5,840 lines)
- Comprehensive verification strategy
- Reliability guarantees (atomic, verified, resumable)
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