The test-aware planning skill. Use instead of vibe-plan whenever the user combines a planning or scoping request with any testing concern — test strategy, test plan, TDD, test case identification, four-layer classification (可测内核/行为胶水/视觉胶水/骨架复用), or checkbox items for a test agent. Works for both English and Chinese requests (规划+测试, 带测试策略, plan with tests, etc.). Produces plan.md (implementation) + test-plan.md (test strategy) as separate files. Not for: writing actual test code, reviewing existing plans, discussing whether to adopt TDD, or planning that doesn't mention tests.