fix(storage): qualify SMART status and report explanations

tests/storage/test_nvme_status_message.py

@@ -0,0 +1,35 @@
+"""Execute only the actual pure HEALTH decision; never source the admin script."""
+import pathlib
+import subprocess
+import unittest
+
+ROOT = pathlib.Path(__file__).resolve().parents[2]
+SOURCE = ROOT / 'scripts/storage/smart-disk-test.sh'
+
+
+class NvmeStatusMessage(unittest.TestCase):
+    def render(self, health):
+        source = SOURCE.read_text()
+        start = source.index('          if [[ "$HEALTH" == "0" ]]; then')
+        end = source.index('\n          fi', start) + len('\n          fi')
+        seam = source[start:end]
+        # Only printf-backed display/translation stubs are available to this seam.
+        harness = '''translate() { printf '%s' "$1"; }
+msg_ok() { printf 'OK:%s\\n' "$1"; }
+msg_warn() { printf 'WARN:%s\\n' "$1"; }
+HEALTH=$1
+'''
+        return subprocess.run(['bash', '-c', harness + seam, 'fixture', health],
+                              check=True, capture_output=True, text=True).stdout.strip()
+
+    def test_zero_describes_critical_warning_not_self_test(self):
+        self.assertEqual(self.render('0'), 'OK:NVMe critical_warning is 0 (no critical warnings reported).')
+
+    def test_nonzero_and_missing_keep_existing_warning_branch(self):
+        for health in ['1', '2', '255', '', '0x00']:
+            with self.subTest(health=health):
+                self.assertEqual(self.render(health), f'WARN:NVMe health status: WARNING (critical_warning = {health})')
+
+
+if __name__ == '__main__':
+    unittest.main()