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- [x] ④ legacy buy Deprecation 헤더: HTTP 200 + deprecation:true 확인 - [x] ⑤ ledger/trades 신규: HTTP 201 + cash_balance_after(-63296.1) + asset_quantity_after(1.0) - [x] ⑥ idempotency duplicate: HTTP 200 + status=duplicate + ledger_entry_id 42 재반환 - [blocked] ③ 태그 mutation: v1_tags token_source guard로 차단, DB bootstrap 미설정 → Feedback Handoff Discovery Input 이관 Co-authored-by: trex-dev-b <trex-dev-b@trex-team.internal> Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>