增强: df-mcp list_tasks spec 声明 status 参数(CR-13 ⚪1 补)

CR-13 审查 ⚪ WATCH-1:df-mcp list_tasks spec 未声明 status(MCP 客户端 schema 不可见)。
补 spec 加 status field(todo/in_progress/in_review/testing/blocked/done/cancelled)。
handler 早已支持过滤(2f8b13f),本次补 schema 声明对齐 tool_registry。
cargo check df-mcp EXIT 0

crates/df-mcp/src/tools.rs

@@ -105,7 +105,7 @@ pub fn all_tools() -> Vec<&'static ToolSpec> {
         spec("delete_project", "软删项目(进回收站,可恢复)——High 风险,默认拒绝,请在 DevFlow 应用内执行", object_schema(json!({"id": str_field("项目 ID")}), &["id"]), High, delete_project),
         spec("bind_directory", "为项目绑定本地代码目录(会做路径冲突检测,Medium 风险+审计日志)", object_schema(json!({"id": str_field("项目 ID"), "path": str_field("本地目录绝对路径")}), &["id", "path"]), Medium, bind_directory),
         // ─── 任务 ───
-        spec("list_tasks", "列出所有未删除任务(可按 project_id 过滤)", object_schema(json!({"project_id": opt_str_field("按项目过滤(可空)")}), &[]), Low, list_tasks),
+        spec("list_tasks", "列出所有未删除任务(可按 project_id/status 过滤)", object_schema(json!({"project_id": opt_str_field("按项目过滤(可空)"), "status": opt_str_field("按状态过滤(todo/in_progress/in_review/testing/blocked/done/cancelled,可空)")}), &[]), Low, list_tasks),
         spec("create_task", "创建任务(Medium 风险,默认允许+审计日志)", object_schema(json!({"project_id": str_field("项目 ID"), "title": str_field("标题"), "description": str_field("描述"), "priority": int_field("优先级(可空,默认 0)")}), &["project_id", "title", "description"]), Medium, create_task),
         spec("update_task", "更新任务(整体替换)", object_schema(json!({"id": str_field("任务 ID"), "project_id": str_field("项目 ID"), "title": str_field("标题"), "description": str_field("描述")}), &["id", "project_id", "title", "description"]), Medium, update_task),
         spec("advance_task", "推进任务状态(需传当前 status 与目标 status,Medium 风险+审计日志)", object_schema(json!({"id": str_field("任务 ID"), "from": str_field("当前 status"), "to": str_field("目标 status")}), &["id", "from", "to"]), Medium, advance_task),