feat: evaluate built-in routing predicates and parameterized host conditions

Store transition when as JSON instead of a lookup key so designers can compose closed-set logic while hosts still supply complex refs with args. Match conditional edges before the unconditional default.

Co-authored-by: Cursor <cursoragent@cursor.com>

README.md

@@ -18,7 +18,7 @@
 
 ## 能力
 
-- 线性或多步图：`StepTransition` + 可选 `RoutingCondition`
+- 线性或多步图：`StepTransition` + 内置谓词 / 宿主 `RoutingCondition`
 - 会签/或签：`ApprovalPolicy.ALL` / `ANY`（多候选人）
 - ACTION 步骤：事务提交后调用宿主 `ActionHandler`
 - 发起人撤回：`WITHDRAWN`，待办任务 `SKIPPED`
@@ -72,7 +72,7 @@ ordo.approve(manager.id(), "maria", "ok");
   ],
   "transitions": [
     { "from": "notify-submitted", "to": "manager" },
-    { "from": "manager", "to": "hr", "when": "days-gt-3", "priority": 0 },
+    { "from": "manager", "to": "hr", "when": { "gt": ["days", 3] }, "priority": 0 },
     { "from": "manager", "to": "notify-approved", "priority": 1 },
     { "from": "hr", "to": "notify-approved" },
     { "from": "notify-approved", "to": null }
@@ -81,7 +81,7 @@ ordo.approve(manager.id(), "maria", "ok");
 ```
 
 - `kind` 默认 `APPROVAL`；ACTION 用 `"action"` 作为 handler 查找键。
-- 转移按 `priority` 升序匹配；`when` 为空或条件命中则走该边；`to: null` 表示结束。
+- 带 `when` 的边先按 `priority` 匹配，都未命中再走无条件边；`to: null` 表示结束。
 - 代码侧可用 `ProcessDefinitionParser.fromJson(...)`。
 - `replace` 会整体替换同 id 定义；存在 `RUNNING` 实例时拒绝替换。
 
@@ -111,7 +111,7 @@ ordo:
 | Bean | 默认 |
 |---|---|
 | `AssigneeResolver` | 候选人即办理人 |
-| `RoutingCondition` | 始终匹配（全局单例；宿主可按 key 分发） |
+| `RoutingCondition` | 始终匹配（`ref` 边；宿主可按 key+args 分发） |
 | `ActionHandler` | 空操作 |
 | `OrdoEventListener` | 可注册多个，提交后按顺序调用 |