重构世界模拟器为模块化配方架构，完善创作编排、会话运行时与 Web UI，并清理过时技能。

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

tests/context-trace.test.ts

@@ -0,0 +1,73 @@
+import { describe, expect, it } from "vitest";
+import {
+  buildContextTrace,
+  pruneContextTraces,
+} from "../src/types/context-trace.js";
+
+function msg(id: string, withTrace = false) {
+  return {
+    id,
+    ...(withTrace
+      ? {
+          contextTrace: buildContextTrace({
+            caller: `c-${id}`,
+            messages: [{ role: "user", content: `hello-${id}` }],
+          }),
+        }
+      : {}),
+  };
+}
+
+describe("pruneContextTraces", () => {
+  it("keeps only the latest N traces", () => {
+    const messages = [
+      msg("1", true),
+      msg("2"),
+      msg("3", true),
+      msg("4", true),
+      msg("5", true),
+      msg("6", true),
+    ];
+    const pruned = pruneContextTraces(messages, 2);
+    expect(pruned.map((m) => Boolean(m.contextTrace))).toEqual([
+      false,
+      false,
+      false,
+      false,
+      true,
+      true,
+    ]);
+    expect(pruned[4].id).toBe("5");
+    expect(pruned[5].contextTrace?.caller).toBe("c-6");
+  });
+
+  it("clears all when keepLatest is 0", () => {
+    const messages = [msg("a", true), msg("b", true)];
+    const pruned = pruneContextTraces(messages, 0);
+    expect(pruned.every((m) => !m.contextTrace)).toBe(true);
+    expect(pruned.map((m) => m.id)).toEqual(["a", "b"]);
+  });
+
+  it("is a no-op when under the limit", () => {
+    const messages = [msg("1", true), msg("2", true)];
+    const pruned = pruneContextTraces(messages, 5);
+    expect(pruned).toBe(messages);
+  });
+});
+
+describe("buildContextTrace", () => {
+  it("counts characters and copies messages", () => {
+    const trace = buildContextTrace({
+      caller: "worker:x",
+      model: "m",
+      messages: [
+        { role: "system", content: "abc" },
+        { role: "user", content: "de" },
+      ],
+    });
+    expect(trace.charCount).toBe(5);
+    expect(trace.caller).toBe("worker:x");
+    expect(trace.model).toBe("m");
+    expect(trace.messages).toHaveLength(2);
+  });
+});