f80d45aa6b
- Added a 4-slot concurrency limiter for Anthropic multi-image resize work. - Prioritized client-owned request fields and `claudeCodeVersion`-based `User-Agent` headers. - Ignored terminal `message_delta` envelopes and treated missing `usage`/`delta` payloads as non-fatal. - Stopped ping-only streams from consuming first-event watchdog logic and preserved timeout retries.