Implement BAT-011 transactional write service split

docs/batches/bat-011_20260703_transactional-write-service-split/index.md

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+# BAT-011 Transactional write service split
+
+- Profile: standard
+- Status: release-candidate
+- Included REQ: REQ-015
+- Discovery: dcy-011
+- Owner: 렛저장인
+- Date (KST): 2026-07-03
+
+## 목표
+
+REQ-015에 따라 account / transaction / budget / category rule-category mutation 경로를 더 좁은 write-oriented application service로 분리한다. 기존 `service.py`, MCP adapter, Streamlit gateway, dashboard 호출부와 response contract는 유지한 채 Phase 4 첫 구현 슬라이스를 실제 코드와 검증 evidence로 마무리한다.
+
+## 산출물
+
+- `jarca_ledger_mcp/application/` write-oriented service modules
+- 기존 broad application modules의 compatibility re-export / delegation 정리
+- full pytest 및 contract-sensitive regression evidence
+- BAT-011 planning/design/implementation/verification documents
+
+## 범위 제한
+
+- import preview/import/rollback split
+- advanced workflow(cross-transfer/reconciliation/assets/workbench) 분리
+- HTTP adapter 추가
+- destructive migration
+
+## 문서
+
+- `planning.md`: Phase 4 첫 delivery plan, risks, validation gate
+- `design.md`: write service boundary / delegation design
+- `implementation.md`: changed files, execution log, validation commands
+- `verification.md`: AC mapping, PASS/FAIL, REQ Implemented decision