feat(errors): add network error classification with user-friendly messages (#53)

fix: add Connection: close header for streaming requests (#38)

fix(http): add shared HTTP client with connection pooling (#24)

refactor: update kiro_gateway naming to kiro

refactor: improve timeout handling and logging in http_client and streaming

feat: add configurable streaming read timeout (#9)

feat: add first token timeout retry for streaming requests

feat: Complete Kiro OpenAI Gateway implementation