debug(dso-7nos): add stderr logging to _run_acli for CI diagnostics

Print ACLI stderr before re-raising CalledProcessError so CI logs
show the actual error message from the Go binary.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: JoeOakhartNava

plugins/dso/scripts/acli-integration.py

@@ -73,8 +73,12 @@ def _run_acli(
                 delay = 2 ** (attempt + 1)  # 2s, 4s
                 time.sleep(delay)
 
-    # All attempts exhausted — re-raise the last error
+    # All attempts exhausted — include stderr in the error message for debugging
     assert last_error is not None
+    if last_error.stderr:
+        import sys
+
+        print(f"ACLI stderr: {last_error.stderr.strip()}", file=sys.stderr)
     raise last_error