perf(tests): reduce assert/refute timeouts for faster tests

Reduce various test timeouts that were unnecessarily long:
- assert_push timeouts: 150ms → 75ms (6 tests in agent_channel_test)
- refute_receive timeouts: 200ms → 50ms (3 tests in worker tests)

With 50ms channel debounce, 75ms is sufficient for assert_push.
For refute_receive (expecting no message), 50ms is plenty.

Estimated savings: ~600ms across affected tests

test/towerops/workers/agent_latency_evaluator_test.exs

@@ -631,7 +631,7 @@ defmodule Towerops.Workers.AgentLatencyEvaluatorTest do
       assert :ok = AgentLatencyEvaluator.perform(%Oban.Job{args: %{}})
 
       # Local agents should not trigger reassignment
-      refute_receive {:device_reassigned, _}, 200
+      refute_receive {:latency_probe_jobs, _}, 50
     end
   end
 

test/towerops/workers/cloud_latency_probe_worker_test.exs

@@ -76,7 +76,7 @@ defmodule Towerops.Workers.CloudLatencyProbeWorkerTest do
       assert :ok == CloudLatencyProbeWorker.perform(%Oban.Job{})
 
       # Should not receive any probe jobs
-      refute_receive {:latency_probe_jobs, _}, 200
+      refute_receive {:latency_probe_jobs, _}, 50
     end
 
     test "skips devices assigned to local agents" do
@@ -110,7 +110,7 @@ defmodule Towerops.Workers.CloudLatencyProbeWorkerTest do
 
       assert :ok == CloudLatencyProbeWorker.perform(%Oban.Job{})
 
-      refute_receive {:latency_probe_jobs, _}, 200
+      refute_receive {:latency_probe_jobs, _}, 50
     end
   end
 end

test/towerops_web/channels/agent_channel_test.exs

@@ -533,7 +533,7 @@ defmodule ToweropsWeb.AgentChannelTest do
       send(socket.channel_pid, {:assignments_changed, :assigned})
 
       # Jobs push should come after debounce delay (50ms in test)
-      assert_push "jobs", %{binary: _jobs_binary}, 150
+      assert_push "jobs", %{binary: _jobs_binary}, 75
     end
 
     test "debounces rapid assignment changes", %{socket: socket} do
@@ -543,7 +543,7 @@ defmodule ToweropsWeb.AgentChannelTest do
       send(socket.channel_pid, {:assignments_changed, :assigned})
 
       # Should only get one push (debounced) - 50ms debounce in test
-      assert_push "jobs", %{binary: _}, 150
+      assert_push "jobs", %{binary: _}, 75
       refute_push "jobs", %{}, 50
     end
   end
@@ -1340,7 +1340,7 @@ defmodule ToweropsWeb.AgentChannelTest do
       )
 
       # Should receive jobs message with 2 devices
-      assert_push "jobs", %{binary: initial_jobs_binary}, 150
+      assert_push "jobs", %{binary: initial_jobs_binary}, 75
       {:ok, decoded_initial} = Base.decode64(initial_jobs_binary)
       initial_job_list = AgentJobList.decode(decoded_initial)
       initial_device_ids = initial_job_list.jobs |> Enum.map(& &1.device_id) |> Enum.uniq()
@@ -1352,7 +1352,7 @@ defmodule ToweropsWeb.AgentChannelTest do
       {:ok, _deleted} = Towerops.Devices.delete_device(device)
 
       # Should receive updated jobs message with only 1 device
-      assert_push "jobs", %{binary: updated_jobs_binary}, 150
+      assert_push "jobs", %{binary: updated_jobs_binary}, 75
       {:ok, decoded_updated} = Base.decode64(updated_jobs_binary)
       updated_job_list = AgentJobList.decode(decoded_updated)
       updated_device_ids = updated_job_list.jobs |> Enum.map(& &1.device_id) |> Enum.uniq()
@@ -1368,7 +1368,7 @@ defmodule ToweropsWeb.AgentChannelTest do
       {:ok, _deleted} = Towerops.Devices.delete_device(device)
 
       # Wait for jobs refresh
-      assert_push "jobs", _, 150
+      assert_push "jobs", _, 75
 
       # Try to send a result for the deleted device
       result = %SnmpResult{
@@ -1402,7 +1402,7 @@ defmodule ToweropsWeb.AgentChannelTest do
       end
 
       # Should only receive ONE jobs message (debounced) - 50ms debounce in test
-      assert_push "jobs", %{binary: _jobs_binary}, 150
+      assert_push "jobs", %{binary: _jobs_binary}, 75
 
       # Should NOT receive additional jobs messages
       refute_push "jobs", _, 50