docs(proofline): capture portfolio ledger discovery

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# Unified ledger persistence and regression evidence
## Criterion
Unified ledger query는 portfolio/source keyset ordering에 맞는 PostgreSQL index migration을 제공하고 API/OpenAPI/repository 계약 회귀로 검증되어야 한다.
## Verification
- disposable PostgreSQL fresh upgrade가 head `20260820_0030`과 `idx_portfolio_ledger_portfolio_recorded_entry_desc` 생성을 확인하고 focused/full suite가 통과한다.
- 구현 평가: fresh migration 확인 및 전체 회귀 `664 passed, 16 skipped`가 있다. 운영 규모 `EXPLAIN ANALYZE` latency 관찰은 비차단 후속이다.