/ultrareview consistently failing with upstream service errors (502, 520, socket close)

Description

The /ultrareview command has been consistently failing throughout the day (April 25, 2026) with a series of upstream service errors. All attempts fail after 3 retries.

Error sequence (chronological)

1. incorrect header check — zlib decompression error (Content-Encoding mismatch in cloud service response)
2. Request failed with status code 502 after 3 attempts
3. Request failed with status code 520 after 3 attempts
4. The socket connection was closed unexpectedly. For more information, pass 'verbose: true' in the second argument to fetch() after 3 attempts (x2)

Environment

• Claude Code CLI (claude-sonnet-4-6)
• macOS Darwin 25.4.0
• Branch: feature/initial-import
• Date: 2026-04-25

Notes

• All errors are upstream/service-side — no local configuration or code changes were made between attempts
• The errors span multiple error classes (HTTP 502, Cloudflare 520, socket close, zlib decompression), suggesting general service instability rather than a single specific failure mode
• Retrying over several hours did not resolve the issue