Features:
- Automatic backend selection (Node.js vs WASM)
- Conditional package exports for environment-aware imports
- Comprehensive documentation (2080+ lines)

Testing:
- 30/30 tests passed (20 local + 10 Docker E2E)
- Zero regressions confirmed
- 100% backward compatible

Documentation:
- REASONINGBANK_BACKENDS.md - Usage guide
- IMPLEMENTATION_SUMMARY.md - Technical details
- DOCKER_VALIDATION_RESULTS.md - E2E validation
- NO_REGRESSIONS_CONFIRMED.md - Final sign-off