Add thread execution conflict guards to chat flows

tests/thread-execution-conflict-ui.test.ts

@@ -0,0 +1,51 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import {
+  describeThreadConversationExecutionConflict,
+  labelForThreadConversationExecutionConflictDecision,
+} from "../src/lib/thread-execution-conflict-ui.ts";
+
+test("describeThreadConversationExecutionConflict explains preferred gui mode with project-scoped guidance", () => {
+  const description = describeThreadConversationExecutionConflict({
+    projectId: "thread-ui",
+    projectName: "Boss UI 主线程",
+    deviceId: "mac-studio",
+    deviceName: "Mac Studio",
+    folderKey: "mac-studio:boss",
+    preferredExecutionMode: "gui",
+    allowPolicy: "forbid",
+    conflictState: "blocked",
+    reason: "preferred_gui_mode",
+    actions: ["forbid", "allow_once", "allow_always"],
+  });
+
+  assert.equal(description.title, "当前项目默认先走 GUI");
+  assert.match(description.summary, /Mac Studio/);
+  assert.match(description.summary, /只对这个项目/);
+  assert.match(description.summary, /Boss UI 主线程/);
+});
+
+test("describeThreadConversationExecutionConflict explains project-level forbid without implying a global lock", () => {
+  const description = describeThreadConversationExecutionConflict({
+    projectId: "thread-ui",
+    projectName: "Boss UI 主线程",
+    deviceId: "mac-studio",
+    deviceName: "Mac Studio",
+    folderKey: "mac-studio:boss",
+    preferredExecutionMode: "cli",
+    allowPolicy: "forbid",
+    conflictState: "blocked",
+    reason: "project_conflict_forbid",
+    actions: ["forbid", "allow_once", "allow_always"],
+  });
+
+  assert.equal(description.title, "当前项目已命中并发保护");
+  assert.match(description.summary, /最近检测到 GUI \/ CLI 同时活动/);
+  assert.match(description.summary, /只影响这个项目/);
+});
+
+test("labelForThreadConversationExecutionConflictDecision keeps the three project-scoped actions concise", () => {
+  assert.equal(labelForThreadConversationExecutionConflictDecision("forbid"), "禁止");
+  assert.equal(labelForThreadConversationExecutionConflictDecision("allow_once"), "允许本次");
+  assert.equal(labelForThreadConversationExecutionConflictDecision("allow_always"), "永久放行");
+});