Fix terminal dashboard ANSI/control byte injection

elixir/lib/symphony_elixir/status_dashboard.ex

@@ -1174,6 +1174,7 @@ defmodule SymphonyElixir.StatusDashboard do
             payload
             |> inspect(pretty: true, limit: 30)
             |> String.replace("\n", " ")
+            |> sanitize_ansi_and_control_bytes()
             |> String.trim()
         end
     end
@@ -1182,16 +1183,25 @@ defmodule SymphonyElixir.StatusDashboard do
   defp humanize_codex_payload(payload) when is_binary(payload) do
     payload
     |> String.replace("\n", " ")
+    |> sanitize_ansi_and_control_bytes()
     |> String.trim()
   end
 
   defp humanize_codex_payload(payload) do
     payload
     |> inspect(pretty: true, limit: 20)
     |> String.replace("\n", " ")
+    |> sanitize_ansi_and_control_bytes()
     |> String.trim()
   end
 
+  defp sanitize_ansi_and_control_bytes(value) when is_binary(value) do
+    value
+    |> String.replace(~r/\x1B\[[0-9;]*[A-Za-z]/, "")
+    |> String.replace(~r/\x1B./, "")
+    |> String.replace(~r/[\x00-\x1F\x7F]/, "")
+  end
+
   defp humanize_codex_method("thread/started", payload) do
     thread_id = map_path(payload, ["params", "thread", "id"]) || map_path(payload, [:params, :thread, :id])
 

elixir/test/symphony_elixir/orchestrator_status_test.exs

@@ -1296,6 +1296,35 @@ defmodule SymphonyElixir.OrchestratorStatusTest do
     refute plain =~ " notification "
   end
 
+  test "status dashboard strips ANSI and control bytes from last codex message" do
+    payload =
+      "cmd: " <>
+        <<27>> <>
+        "[31mRED" <>
+        <<27>> <>
+        "[0m" <>
+        <<0>> <>
+        " after\nline"
+
+    row =
+      StatusDashboard.format_running_summary_for_test(%{
+        identifier: "MT-898",
+        state: "running",
+        session_id: "thread-1234567890",
+        codex_app_server_pid: "4242",
+        codex_total_tokens: 12,
+        runtime_seconds: 15,
+        last_codex_event: :notification,
+        last_codex_message: payload
+      })
+
+    plain = Regex.replace(~r/\e\[[0-9;]*m/, row, "")
+
+    assert plain =~ "cmd: RED after line"
+    refute plain =~ <<27>>
+    refute plain =~ <<0>>
+  end
+
   test "status dashboard expands running row to requested terminal width" do
     terminal_columns = 140