本目录收拢 balance-history 相关文档，减少 doc/ 根目录里的混排。
- balance-history-rpc.md
- balance-history-rpc_en.md
- balance-history-readiness-design.md
- balance-history-rollback数据模型设计.md
- balance-history-review-remediation-plan.md
- balance-history-test-matrix.md
- balance-history-regtest-framework.md
- balance-history-regtest-smoke.md
- balance-history-regtest-stable-lag-smoke.md
- balance-history-regtest-reorg-smoke.md
- balance-history-regtest-multi-reorg-smoke.md
- balance-history-regtest-restart-reorg-smoke.md
- balance-history-regtest-restart-multi-reorg-smoke.md
- balance-history-regtest-restart-hybrid-reorg-smoke.md
- balance-history-regtest-snapshot-recovery.md
- balance-history-regtest-snapshot-restart-recovery.md
- balance-history-regtest-snapshot-install-repeat.md
- balance-history-regtest-snapshot-install-retry.md
- balance-history-regtest-snapshot-install-failure.md
- balance-history-regtest-snapshot-install-corrupt.md
- balance-history-regtest-snapshot-install-downgrade.md
- balance-history-regtest-rpc-semantics.md
- balance-history-regtest-history-balance-oracle.md
- balance-history-regtest-spend-graph-queries.md
- balance-history-regtest-multi-input-same-block-queries.md
- balance-history-regtest-loader-switch.md
- balance-history-regtest-deep-reorg-smoke.md
- balance-history-regtest-undo-retention-reorg.md
- balance-history-regtest-undo-retention-same-block-aggregate-reorg.md
- balance-history-regtest-restart-same-block-aggregate-reorg.md
跨组件与总设计文档仍保留在 doc/ 根目录，例如：