feat(core): HTTP 재시도/백오프 + 전송계층 에러분류 (opt-in)#41
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감사(전수 논증)의 최대 레버리지 코어 약점 상환 — 행복경로 전용이던 http 핫패스에 견고성 원시기능을 코어 한 곳에 도입. 20개+ 서비스로 복붙되던 429/일시오류 처리를 옵트인으로 흡수할 토대. - _send() 단일 진입점으로 통합(_request_raw·get_text가 공유). 모든 동사에 retry 인자 추가. - Retry(attempts, statuses=(429,503), backoff, respect_retry_after): 지수 백오프 + 응답 Retry-After(delta-seconds) 우선 존중. - NetworkError: 전송계층 실패(연결/타임아웃) 분류. 원본 httpx 예외를 __cause__로 보존. 핵심 설계: **기본값(retry 미지정)은 동작 완전 무변경** — 재시도 0회, 전송 예외는 원본 httpx 그대로 전파. zotero가 9곳에서 쓰는 `except httpx.ConnectError`를 깨지 않기 위해 래핑·재시도를 모두 opt-in으로 둠. 서비스는 필요 시 retry=Retry(...)로 점진 채택. 864 passed(신규 5: 503 복구·Retry-After 존중·소진 시 UpstreamError·전송오류→NetworkError· 기본 무재시도 raw httpx 전파) · ruff clean. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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#36 머지로 stacked 베이스가 삭제돼 닫힌 #37을 대체(retry 커밋만 main 위로 리베이스).
864 passed(+5) · ruff clean.
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