chore(skills): 引入 agent skills 与锁文件

- superpowers（14 个）：流程纪律（brainstorming/TDD/debug/review 等）
- mobile-android-design：Compose + Material 3 设计实现
- android-clean-architecture：分层/UseCase/Repository/Hilt/Room
- compose-multiplatform-patterns / kotlin-coroutines-flows：KMP 与协程
- skills-lock.json：可复现锁文件；陈旧副本 agent/ 加入 .gitignore

.agents/skills/systematic-debugging/test-academic.md

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+# Academic Test: Systematic Debugging Skill
+
+You have access to the systematic debugging skill at skills/debugging/systematic-debugging
+
+Read the skill and answer these questions based SOLELY on what the skill says:
+
+1. What are the four phases of systematic debugging?
+2. What must you do BEFORE attempting any fix?
+3. In Phase 3, what should you do if your first hypothesis doesn't work?
+4. What does the skill say about fixing multiple things at once?
+5. What should you do if you don't fully understand the issue?
+6. Is it ever acceptable to skip the process for simple bugs?
+
+Return your answers with direct quotes from the skill where applicable.