fix: health monitor disables SSID pool immediately on PING failure

Ring-buffer SIGSEGV counts were unreliable for growth detection; the pool
broadcast is the only known crash cause, so disable it on first failure.

tests/test_health.py

@@ -49,15 +49,22 @@ class HealthCheckTest(unittest.TestCase):
     def test_down_with_growing_sigsegv_disables_pool(self):
         self.ping_ok = False
         self.sigsegs = 5
-        server._health['sigsegv_last'] = 3
         result = server.health_check()
-        self.assertIn('pool-disabled', result['last_action'])
+        self.assertIn('pool broadcast disabled', result['last_action'])
         self.assertEqual(self.uci_state['pineapd.@ssidpool[0].disable'], '1')
         self.assertIn(['/etc/init.d/pineapd', 'restart'], [r[0] for r in self.runs])
         self.assertEqual(result['fixes'], 1)
 
+    def test_down_with_pool_already_disabled_restarts_pineapd(self):
+        self.ping_ok = False
+        self.uci_state['pineapd.@ssidpool[0].disable'] = '1'
+        result = server.health_check()
+        self.assertEqual(result['last_action'], 'pineapd restart')
+        self.assertIn(['/etc/init.d/pineapd', 'restart'], [r[0] for r in self.runs])
+
     def test_down_without_crash_brings_monitor_up(self):
         self.ping_ok = False
+        self.uci_state['pineapd.@ssidpool[0].disable'] = '1'
         self.iw_out = 'wlan0mon\n'
         result = server.health_check()
         self.assertEqual(result['last_action'], 'wlan1mon brought up')
@@ -67,7 +74,7 @@ class HealthCheckTest(unittest.TestCase):
         self.ping_ok = False
         server._health['sigsegv_last'] = 4
         result = server.health_check()
-        self.assertEqual(result['last_action'], 'pineapd restart')
+        self.assertIn('pineapd restart', result['last_action'])
         self.assertIn(['/etc/init.d/pineapd', 'restart'], [r[0] for r in self.runs])
 
     def test_fix_cooldown_prevents_thrash(self):