Delivered: 強化效能旁路、Bun-Native 整合、開發體驗與模組工具四大維度

Key accomplishments:
- NativeOrbitDetector + NativeFeatures — Bun runtime capability detection
- Fast-path routing O(1) DI bypass (~76% latency reduction)
- Lite Satellite — object-literal satellites in gravito.config.ts
- Static OpenAPI 3.1 generation via gravito openapi:generate
- Dependency graph tooling via gravito deps:graph
- CVE-2025-29927 security protection + MiddlewareDriftException

10/10 requirements satisfied (PERF-01~03, DX-01~03, BUN-01~03, TOOL-01)
6 phases, 10 plans, 62 commits, 98 files changed

See .planning/MILESTONES.md for full details.