- Make serialize_transaction_and_encode sync and route through buffer pool
(serialization::serialize_transaction_sync) to cut allocs on hot path
- Build single-submit body with format! instead of json!+to_string() in bloxroute
- Add serialize_transactions_batch_sync; bloxroute batch uses it and format! for entries
- Fix first-submit cold start: immediate first ping, then 30s keepalive interval
- Fix high latency after ~5 min: pool_max_idle_per_host=4, pool_idle_timeout=300s
(BlockRazor, Temporal, Node1, Astralane, Stellium) so submit reuses ping connection
- Ping: 1.5s timeout, consume response body so connection returns to pool
- poll_transaction_confirmation: avoid cloning status.value[0], use ref
- Translate all swqos comments to English
Co-authored-by: Cursor <cursoragent@cursor.com>
