fix: filter codex subthreads during auto import

tests/device-import-draft.test.ts

@@ -537,7 +537,7 @@ test("existing bound production devices auto-sync suggested candidates into conv
   assert.equal(payload.importDraft?.status, "applied");
   assert.equal(payload.importDraft?.selectedCandidateIds.length, 2);
 
-  const nextState = await readState();
+  let nextState = await readState();
   const yuandiProject = nextState.projects.find(
     (project) => project.threadMeta.codexThreadRef === "session-yuandi-1",
   );
@@ -551,4 +551,50 @@ test("existing bound production devices auto-sync suggested candidates into conv
 
   const device = nextState.devices.find((item) => item.id === "mac-studio");
   assert.deepEqual(device?.projects, ["yuandi", "wenshenapp"]);
+
+  const followupHeartbeat = await deviceHeartbeatRoute(
+    new NextRequest("http://127.0.0.1:3000/api/device-heartbeat", {
+      method: "POST",
+      headers: { "content-type": "application/json" },
+      body: JSON.stringify({
+        deviceId: "mac-studio",
+        token: "boss-mac-studio-token",
+        name: "Mac Studio",
+        avatar: "M",
+        account: "17600003315",
+        status: "online",
+        quota5h: 68,
+        quota7d: 81,
+        projects: ["Boss 移动控制台", "硬件审计协作"],
+        endpoint: "mac://kris.local",
+        projectCandidates: [
+          {
+            folderName: "yuandi",
+            folderRef: "/Users/kris/code/yuandi",
+            threadId: "session-yuandi-1",
+            threadDisplayName: "Epicurus",
+            codexFolderRef: "/Users/kris/code/yuandi",
+            codexThreadRef: "session-yuandi-1",
+            lastActiveAt: "2026-03-30T12:55:56+08:00",
+            suggestedImport: true,
+          },
+        ],
+      }),
+    }),
+  );
+  assert.equal(followupHeartbeat.status, 200);
+
+  nextState = await readState();
+  const remainingYuandi = nextState.projects.find(
+    (project) => project.threadMeta.codexThreadRef === "session-yuandi-1",
+  );
+  const removedWenshen = nextState.projects.find(
+    (project) => project.threadMeta.codexThreadRef === "session-wenshenapp-1",
+  );
+  assert.ok(remainingYuandi, "expected still-selected candidate to stay imported");
+  assert.equal(removedWenshen, undefined, "auto-sync should prune stale imported threads that disappeared from candidates");
+  assert.deepEqual(
+    nextState.devices.find((item) => item.id === "mac-studio")?.projects,
+    ["yuandi"],
+  );
 });

tests/local-agent-codex-discovery.test.mjs

@@ -83,6 +83,21 @@ test("discoverCodexProjectCandidates prefers Codex sqlite indexes and session na
     null,
     null,
   );
+  insertThread.run(
+    "019d3bossworker",
+    path.join(codexRoot, "sessions/2026/03/30/rollout-boss-worker.jsonl"),
+    1774845620,
+    1774845630,
+    "desktop",
+    "openai",
+    "/Users/kris/code/boss",
+    "你是只读分析子线程",
+    "workspace-write",
+    "never",
+    0,
+    "Sagan",
+    "explorer",
+  );
   insertThread.run(
     "019d3yuandiexplorer",
     path.join(codexRoot, "sessions/2026/03/30/rollout-yuandi-explorer.jsonl"),
@@ -137,6 +152,7 @@ test("discoverCodexProjectCandidates prefers Codex sqlite indexes and session na
     VALUES (?, 0, 'info', 'codex', ?, 0)
   `);
   insertLog.run(1774845618, "019d3bossmain");
+  insertLog.run(1774845630, "019d3bossworker");
   insertLog.run(1774845776, "019d3yuandiexplorer");
   logsDb.close();
 
@@ -183,8 +199,10 @@ test("discoverCodexProjectCandidates prefers Codex sqlite indexes and session na
   assert.equal(discovered.projectCandidates.length, 2);
 
   const bossSession = discovered.projectCandidates.find((item) => item.threadId === "019d3bossmain");
+  const bossWorker = discovered.projectCandidates.find((item) => item.threadId === "019d3bossworker");
   const yuandiSession = discovered.projectCandidates.find((item) => item.threadId === "019d3yuandiexplorer");
   assert.ok(bossSession);
+  assert.equal(bossWorker, undefined, "subagent/explorer threads should be filtered when a primary thread exists for the same folder");
   assert.ok(yuandiSession);
   assert.equal(bossSession?.folderName, "boss");
   assert.equal(bossSession?.codexFolderRef, "/Users/kris/code/boss");