feat: 初始化 SCALE OS 工程框架

- 添加 SCALE Engine 配置 (.scale/)
- 添加 OpenClaw Agent 配置 (.openclaw/)
- 添加知识文档 (AGENTS.md, TOOLS.md)
- 添加质量契约和工作流配置
- 添加 22 个工作流模板
- 添加验证脚本和门控脚本
- 添加 skills-registry 技能注册表

docs/workflow/templates/summary.md

@@ -0,0 +1,19 @@
+# Summary
+
+## Delivered Changes
+
+TBD
+
+## Remaining Risks
+
+TBD
+
+## Follow-Ups
+
+TBD
+
+## Metric Row
+
+| Date | Task | Level | Services | Files Changed | First Verification Pass | Fix Iterations | Artifact Complete | Residual Risk | Final Gate |
+| --- | --- | --- | --- | ---: | --- | ---: | --- | --- | --- |
+|  |  |  |  |  |  |  |  |  |  |