feat(tasks): enforce dynamic execution plans

tests/routes/executionPlan.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from "bun:test";
-import { createExecutionPlanSnapshot, executionPlanNeedsTaskPublish, executionPlanSchema, readExecutionPlans } from "../../src/routes/executionPlan.js";
+import { createExecutionPlanSnapshot, executionPlanNeedsTaskPublish, executionPlanSchema, newExecutionPlanSchema, readExecutionPlans } from "../../src/routes/executionPlan.js";
 import { streamPromptResponse } from "../../src/routes/chatStream.js";
 import type { OpencodeRuntimeAdapter } from "../../src/runtime/opencode.js";
 
@@ -13,6 +13,38 @@ const plan = {
 };
 
 describe("execution plans", () => {
+  it("requires v2 for newly published task plans while retaining legacy reads", () => {
+    const legacy = {
+      title: "Legacy plan",
+      reason: "Stored before graph plans",
+      nodes: [{ id: "inspect", title: "Inspect", status: "pending", owner: "agent", detail: "", evidence: [] }],
+      edges: [],
+    };
+
+    expect(executionPlanSchema.parse(legacy).schema).toBe("execution-plan@1");
+    expect(newExecutionPlanSchema.safeParse(legacy).success).toBe(false);
+  });
+
+  it("accepts explicit v2 branches and structural joins without invented evidence", () => {
+    const v2 = {
+      schema: "execution-plan@2", title: "动态调查", reason: "工单请求现场及数据并行核验",
+      nodes: [
+        { id: "split", title: "并行启动", status: "completed", owner: "agent", detail: "同时核查", evidence: [], kind: "parallel_split" },
+        { id: "field", title: "现场采样", status: "waiting", owner: "human", detail: "等待采样", evidence: [], kind: "activity" },
+        { id: "data", title: "监测数据", status: "completed", owner: "agent", detail: "已核对", evidence: ["e-1"], kind: "activity" },
+        { id: "join", title: "证据汇合", status: "waiting", owner: "agent", detail: "等待现场", evidence: [], kind: "parallel_join" },
+      ],
+      edges: [
+        { id: "field-route", from: "split", to: "field", label: "现场" },
+        { id: "data-route", from: "split", to: "data", label: "数据" },
+        { id: "field-join", from: "field", to: "join", label: "" },
+        { id: "data-join", from: "data", to: "join", label: "" },
+      ],
+    };
+    const parsed = executionPlanSchema.parse(v2);
+    expect(createExecutionPlanSnapshot(parsed, [], "session-1").schema_version).toBe("execution-plan@2");
+    expect(executionPlanSchema.safeParse({ ...v2, edges: [{ ...v2.edges[0], id: "data-route" }, ...v2.edges.slice(1)] }).success).toBe(false);
+  });
   it("rejects missing dependencies, cycles, duplicate IDs and unsupported completion", () => {
     for (const invalid of [
       { ...plan, edges: [{ from: "unknown", to: "sample", label: "" }] },