chore: 将测试策略文档添加到dev启动加载列表

将 docs/architecture/testing-strategy.md 添加到 devLoadAlwaysFiles，
确保开发代理在激活时自动加载测试策略规范。

🤖 Generated with [Claude Code](https://claude.com/claude-code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

.bmad-core/core-config.yaml

@@ -17,6 +17,7 @@ devLoadAlwaysFiles:
   - docs/architecture/coding-standards.md
   - docs/architecture/tech-stack.md
   - docs/architecture/source-tree.md
+  - docs/architecture/testing-strategy.md
 devDebugLog: .ai/debug-log.md
 devStoryLocation: docs/stories
 slashPrefix: BMad