Phase 1: log full reqwest error chain + headers + bytes-received at decode site
Phase 2: HTTP/2 keepalive settings + tcp keepalive on the reqwest builder
Phase 3: engine transparently retries when stream errors before any content;
surface error on mid-stream failure (no double-bill); stream_errors
threshold relaxed 3 -> 5 with the new keepalive
Phase 4: unit tests for the four classes of stream failure
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Hunter Bown
36320c5bea