fix(codex): prevent sound hook timeouts

tests/test_fixes.sh

@@ -21,6 +21,7 @@ GEMINI_SECTION=$(awk '/^cat > "\$BIN_DIR\/ai-gemini"/,/^GEMINIEOF/' "$SCRIPT")
 OPENCODE_SECTION=$(awk '/^cat > "\$BIN_DIR\/ai-opencode"/,/^OPENCODEEOF/' "$SCRIPT")
 CURSOR_SECTION=$(awk '/^cat > "\$BIN_DIR\/ai-cursor"/,/^CURSOREOF/' "$SCRIPT")
 HELPERS_SECTION=$(awk '/^cat > "\$HELPERS_FILE"/,/^HELPEREOF/' "$SCRIPT")
+CODEX_SOUND_HOOKS_SECTION=$(awk '/^_setup_codex_sound_hooks\(\)/,/^}/' "$SCRIPT")
 
 # ── ai-gpt: auto-install codex ────────────────────────────────────────────
 test_gpt_autoinstall() {
@@ -146,6 +147,16 @@ test_native_rule_files_generated() {
   fi
 }
 
+test_codex_sound_hooks_detach_stdio() {
+  local detached_count
+  detached_count=$(printf '%s\n' "$CODEX_SOUND_HOOKS_SECTION" | grep -Fc ') </dev/null >/dev/null 2>&1 &' || true)
+  if [ "$detached_count" -eq 2 ]; then
+    ok "codex hooks: background sound players detach standard streams"
+  else
+    fail "codex hooks: background sound players can keep hook pipes open"
+  fi
+}
+
 # ── Fix 7: trap quotes $TMP correctly ────────────────────────────────────────
 test_fix7_trap_tmp() {
   if grep -q "trap 'rm -rf \"\$TMP\"' EXIT" "$SCRIPT"; then
@@ -289,6 +300,7 @@ test_gemini_native_launcher
 test_cursor_native_launcher
 test_global_rules_include_quality_guidelines
 test_native_rule_files_generated
+test_codex_sound_hooks_detach_stdio
 test_fix7_trap_tmp
 test_android_cli_install_url
 test_android_init_called