READY page: drop the MICS and STAGE keys

BOH MIX is the one tap key left.

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

tests/test_readiness.py

@@ -354,7 +354,6 @@ class TestWatchdog(unittest.TestCase):
         self.assertEqual(tiles["rd_trk_out"]["x"], "TRACKS OUT\nNOT SENT SC")
         self.assertEqual(tiles["rd_trk_out"]["b"], sp.COLORS["warn"][0][0])
         self.assertEqual(tiles["rd_boh"]["x"], "BOH MIX\nTAP WHEN DONE")
-        self.assertEqual(tiles["rd_mics"]["x"], "MICS\n2 VOX MC TIM\nTAP WHEN SET")
         self.assertEqual(tiles["rd_cross"]["b"], sp.COLORS["ok"][0][0])
         self.assertTrue(tiles["ready"]["x"].startswith("READY\n"))
         self.assertIn("TO DO", tiles["ready"]["x"])