Author orch Markdown test plan

docs/tests/orch/run-init/README.md

@@ -1,7 +1,7 @@
 # Orch `run init` Test Plan Index
 
-## Status
+## Case Files
 
-No command case files are authored yet.
-
-Use [../ROADMAP.md](../ROADMAP.md) for planned case slugs and document progress.
+| Case Slug | File | Coverage Note |
+| --- | --- | --- |
+| `run-init-creates-new-run` | [run-init-creates-new-run.md](./run-init-creates-new-run.md) | creates a new active run and persists goal and summary |

docs/tests/orch/run-init/run-init-creates-new-run.md

@@ -0,0 +1,34 @@
+# Case: `run-init-creates-new-run`
+
+## 用例意义
+
+验证 `run init` 会创建新的 orchestration run，并返回稳定的 run 元数据。
+
+## 前置条件
+
+- `TMPDIR/coord.db` 尚不存在或为空路径
+
+## 输入
+
+```bash
+orch --db TMPDIR/coord.db --json run init --run run_blog_001 --goal "Build blog MVP" --summary "Public blog plus admin CRUD"
+```
+
+## 预期输出
+
+- 命令退出码为 `0`
+- `data.run.run_id == "run_blog_001"`
+- `data.run.goal == "Build blog MVP"`
+- `data.run.summary == "Public blog plus admin CRUD"`
+- `data.run.status == "active"`
+- 返回 `created_at` 与 `updated_at`
+
+## 断言结论
+
+- `run init` 会创建 run 记录，而不是只做内存态初始化
+- 新建 run 的默认状态是 `active`
+
+## 补充约束
+
+- `--run` 与 `--goal` 是必填；缺失任一项都应返回 `invalid_input`
+- 当同一 `run_id` 已存在时，应返回 `invalid_state`，而不是覆盖旧 run