fix(nvidia): surface Xid 79/154 GPU bus-fall-off as a physical-reboot-required signal

nvidia-bug-report.sh appends .gz to --output-file when gzip is available,
which silently produced empty nvidia-bug-report.txt in support bundles
(cat looked for the uncompressed name that never existed).

Also: a GPU that falls off the PCIe/NVLink bus (Xid 79) or gets flagged
for Node Reboot Required (Xid 154) mid-SAT-run left every downstream test
failing with generic, unrelated-looking errors (CUDA "unknown error",
"unable to determine device handle") with no indication the GPU needed a
physical power-cycle to recover. Detect these codes from SAT run logs and
surface a plain-English "physical reboot required" message in the task's
failure detail, the persisted component-status DB, a dashboard banner on
the Hardware Summary card, and topology diagram GPU-node severity.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

audit/internal/app/support_bundle.go

@@ -227,9 +227,16 @@ fi
 `}},
 	{name: "export/gpu/nvidia-bug-report.txt", cmd: []string{"sh", "-c", `
 if command -v nvidia-bug-report.sh >/dev/null 2>&1; then
-  nvidia-bug-report.sh --output-file /tmp/bee-nvidia-bug-report.log >/dev/null 2>&1 \
-    && cat /tmp/bee-nvidia-bug-report.log \
-    && rm -f /tmp/bee-nvidia-bug-report.log
+  rm -f /tmp/bee-nvidia-bug-report.log /tmp/bee-nvidia-bug-report.log.gz
+  nvidia-bug-report.sh --output-file /tmp/bee-nvidia-bug-report.log >/dev/null 2>&1
+  if [ -f /tmp/bee-nvidia-bug-report.log.gz ]; then
+    gzip -dc /tmp/bee-nvidia-bug-report.log.gz
+  elif [ -f /tmp/bee-nvidia-bug-report.log ]; then
+    cat /tmp/bee-nvidia-bug-report.log
+  else
+    echo "nvidia-bug-report.sh produced no output file"
+  fi
+  rm -f /tmp/bee-nvidia-bug-report.log /tmp/bee-nvidia-bug-report.log.gz
 else
   echo "nvidia-bug-report.sh not found"
 fi