feat(api): accept a lane tool on create, start and binary probe

server/__tests__/lanes-api.test.js

@@ -988,3 +988,23 @@ exit 1
     assert.equal(r.body.checks[0].name, "tests");
   });
 });
+
+describe("/api/lanes tool tests", () => {
+  it("POST /api/lanes/ensure stores the requested tool", async () => {
+    const res = await request("POST", "/api/lanes/ensure", {
+      cwd: "/tmp/codex-lane",
+      tool: "codex",
+    });
+    assert.equal(res.status, 201);
+    assert.equal(res.body.lane.tool, "codex");
+  });
+
+  it("POST /api/lanes/ensure rejects an unknown tool", async () => {
+    const res = await request("POST", "/api/lanes/ensure", {
+      cwd: "/tmp/bad-tool",
+      tool: "cursor",
+    });
+    assert.equal(res.status, 400);
+    assert.equal(res.body.error.code, "EBADTOOL");
+  });
+});

server/__tests__/run.test.js

@@ -174,4 +174,15 @@ describe("/api/run", () => {
     assert.equal(status, 200);
     assert.ok(Array.isArray(body.items));
   });
+
+  it("GET /api/run/binary?tool=codex probes codex, not claude", async () => {
+    const res = await fetchJson("/api/run/binary?tool=codex");
+    assert.equal(res.status, 200);
+    assert.equal(typeof res.body.found, "boolean");
+  });
+
+  it("GET /api/run/binary rejects an unknown tool", async () => {
+    const res = await fetchJson("/api/run/binary?tool=rm");
+    assert.equal(res.status, 400);
+  });
 });