test: second review -- the upload chat model outside the chain, room checked before spooling, a cut-off body is a 400, bidi controls in titles, the ensemble's deadline wiring, an honest test name (red)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

internal/uploads/worker_queue_test.go

@@ -78,3 +78,15 @@ func TestWorkerSubmit_AJobThatHasLeftTheQueueFreesItsPlace(t *testing.T) {
 
 	assert.NoError(t, w.Submit(r.spool(t, "second")), "the cap counts jobs waiting, not jobs ever submitted")
 }
+
+func TestWorkerHasRoom_SaysWhetherASubmitWouldBeAccepted(t *testing.T) {
+	w := queueWorker(t, 3, 2)
+	assert.True(t, w.HasRoom("alice"))
+	require.NoError(t, submit(w, "alice", 1))
+	require.NoError(t, submit(w, "alice", 2))
+
+	assert.False(t, w.HasRoom("alice"), "alice is at her share")
+	assert.True(t, w.HasRoom("bob"), "bob is not")
+	require.NoError(t, submit(w, "bob", 1))
+	assert.False(t, w.HasRoom("carol"), "the queue as a whole is at its cap")
+}