Merge refreshed docs/i18n-batch-cds-postmortem into docs/i18n-batch-rfc
# Conflicts: # .agents/notes/implemented/architecture/2026-06-11-content-block-vocabulary.i18n.yaml # .agents/notes/implemented/architecture/2026-06-11-content-block-vocabulary.zh.md # .agents/notes/implemented/architecture/2026-06-11-custom-schema-dsl.i18n.yaml # .agents/notes/implemented/architecture/2026-06-11-custom-schema-dsl.zh.md # .agents/notes/implemented/architecture/2026-06-11-dev-invariants-over-deep-readonly.i18n.yaml # .agents/notes/implemented/architecture/2026-06-11-dev-invariants-over-deep-readonly.zh.md # .agents/notes/implemented/architecture/2026-06-11-event-sourced-sessions.i18n.yaml # .agents/notes/implemented/architecture/2026-06-11-event-sourced-sessions.zh.md # .agents/notes/implemented/architecture/2026-06-11-microkernel-event-taxonomy.i18n.yaml # .agents/notes/implemented/architecture/2026-06-11-microkernel-event-taxonomy.zh.md # .agents/notes/implemented/architecture/2026-06-11-runtime-arg-validation.i18n.yaml # .agents/notes/implemented/architecture/2026-06-11-runtime-arg-validation.zh.md # .agents/notes/implemented/architecture/2026-06-11-structured-error-taxonomy.i18n.yaml # .agents/notes/implemented/architecture/2026-06-11-structured-error-taxonomy.zh.md # .agents/notes/implemented/architecture/2026-06-11-tool-schemas-in-prompt-assembly.i18n.yaml # .agents/notes/implemented/architecture/2026-06-11-tool-schemas-in-prompt-assembly.zh.md # .agents/notes/implemented/architecture/2026-06-13-capability-seams.i18n.yaml # .agents/notes/implemented/architecture/2026-06-13-capability-seams.zh.md # .agents/notes/implemented/architecture/2026-06-13-twin-llm-adapters.i18n.yaml # .agents/notes/implemented/architecture/2026-06-13-twin-llm-adapters.zh.md # .agents/notes/implemented/architecture/2026-06-14-session-persistence.i18n.yaml # .agents/notes/implemented/architecture/2026-06-14-session-persistence.zh.md # .agents/notes/implemented/architecture/2026-06-15-turn-enclosure-invariant.i18n.yaml # .agents/notes/implemented/architecture/2026-06-15-turn-enclosure-invariant.zh.md # .agents/notes/implemented/architecture/2026-06-17-filesystem-capability-seam.i18n.yaml # .agents/notes/implemented/architecture/2026-06-17-filesystem-capability-seam.zh.md # .agents/notes/implemented/architecture/2026-06-18-agent-lifecycle-and-ownership-seams.i18n.yaml # .agents/notes/implemented/architecture/2026-06-18-agent-lifecycle-and-ownership-seams.zh.md # .agents/notes/implemented/architecture/2026-06-18-session-surface.i18n.yaml # .agents/notes/implemented/architecture/2026-06-18-session-surface.zh.md # .agents/notes/implemented/architecture/2026-06-18-shared-persistence-write-coordinator.i18n.yaml # .agents/notes/implemented/architecture/2026-06-18-shared-persistence-write-coordinator.zh.md # .agents/notes/implemented/architecture/2026-06-20-branded-ids.i18n.yaml # .agents/notes/implemented/architecture/2026-06-20-branded-ids.zh.md # .agents/notes/implemented/architecture/2026-06-20-extract-example-app-packages.i18n.yaml # .agents/notes/implemented/architecture/2026-06-20-extract-example-app-packages.zh.md # .agents/notes/implemented/architecture/2026-06-20-package-hierarchy.i18n.yaml # .agents/notes/implemented/architecture/2026-06-20-package-hierarchy.md # .agents/notes/implemented/architecture/2026-06-20-package-hierarchy.zh.md # .agents/notes/implemented/architecture/2026-06-21-mandatory-app-attribution-headers.i18n.yaml # .agents/notes/implemented/architecture/2026-06-21-mandatory-app-attribution-headers.zh.md # .agents/notes/implemented/architecture/2026-06-24-web-capability-seam.i18n.yaml # .agents/notes/implemented/architecture/2026-06-24-web-capability-seam.zh.md # .agents/notes/implemented/architecture/2026-06-26-file-context-as-event-gate.i18n.yaml # .agents/notes/implemented/architecture/2026-06-26-file-context-as-event-gate.zh.md # .agents/notes/implemented/architecture/2026-06-30-bash-stdin-env-trusted-plugin-surface.i18n.yaml # .agents/notes/implemented/architecture/2026-06-30-bash-stdin-env-trusted-plugin-surface.zh.md # .agents/notes/implemented/architecture/2026-06-30-event-domain-semantics.i18n.yaml # .agents/notes/implemented/architecture/2026-06-30-event-domain-semantics.zh.md # .agents/notes/implemented/architecture/2026-07-02-fs-per-session-cwd.i18n.yaml # .agents/notes/implemented/architecture/2026-07-02-fs-per-session-cwd.zh.md # .agents/notes/implemented/architecture/2026-07-02-result-time-applied-hunk-diffs.i18n.yaml # .agents/notes/implemented/architecture/2026-07-02-result-time-applied-hunk-diffs.zh.md # .agents/notes/implemented/architecture/2026-07-02-tool-render-intent-union.i18n.yaml # .agents/notes/implemented/architecture/2026-07-02-tool-render-intent-union.zh.md # .agents/notes/implemented/architecture/2026-07-03-filesystem-directory-listing-seam.i18n.yaml # .agents/notes/implemented/architecture/2026-07-03-filesystem-directory-listing-seam.zh.md # .agents/notes/implemented/architecture/2026-07-05-prompt-variables-and-tool-guidance-ownership.i18n.yaml # .agents/notes/implemented/architecture/2026-07-05-prompt-variables-and-tool-guidance-ownership.zh.md # .agents/notes/implemented/architecture/2026-07-05-reconstructable-requests.i18n.yaml # .agents/notes/implemented/architecture/2026-07-05-reconstructable-requests.zh.md # .agents/notes/implemented/architecture/2026-07-05-subagent-provider-lifecycle-events.i18n.yaml # .agents/notes/implemented/architecture/2026-07-05-subagent-provider-lifecycle-events.zh.md # .agents/notes/implemented/architecture/2026-07-06-timeout-deadline-library.i18n.yaml # .agents/notes/implemented/architecture/2026-07-06-timeout-deadline-library.zh.md # .agents/notes/implemented/architecture/2026-07-07-tool-call-timeout-policy.i18n.yaml # .agents/notes/implemented/architecture/2026-07-07-tool-call-timeout-policy.zh.md # .agents/notes/implemented/architecture/2026-07-08-agent-scope-contexts.i18n.yaml # .agents/notes/implemented/architecture/2026-07-08-agent-scope-contexts.zh.md # .agents/notes/implemented/architecture/2026-07-12-agent-scope-runtime-design.i18n.yaml # .agents/notes/implemented/architecture/2026-07-12-agent-scope-runtime-design.zh.md # .agents/notes/implemented/feature/2026-06-14-acp-agent-client-protocol.i18n.yaml # .agents/notes/implemented/feature/2026-06-14-acp-agent-client-protocol.zh.md # .agents/notes/implemented/feature/2026-06-14-acp-multi-session.i18n.yaml # .agents/notes/implemented/feature/2026-06-14-acp-multi-session.zh.md # .agents/notes/implemented/feature/2026-06-15-code-mode.i18n.yaml # .agents/notes/implemented/feature/2026-06-15-code-mode.zh.md # .agents/notes/implemented/feature/2026-06-17-filesystem-tool-schemas.i18n.yaml # .agents/notes/implemented/feature/2026-06-17-filesystem-tool-schemas.zh.md # .agents/notes/implemented/feature/2026-06-18-acp-terminal-and-tool-rendering.i18n.yaml # .agents/notes/implemented/feature/2026-06-18-acp-terminal-and-tool-rendering.zh.md # .agents/notes/implemented/feature/2026-06-18-compaction-capability-seam.i18n.yaml # .agents/notes/implemented/feature/2026-06-18-compaction-capability-seam.zh.md # .agents/notes/implemented/feature/2026-06-21-subagent-capability-seam.i18n.yaml # .agents/notes/implemented/feature/2026-06-21-subagent-capability-seam.md # .agents/notes/implemented/feature/2026-06-21-subagent-capability-seam.zh.md # .agents/notes/implemented/feature/2026-06-22-acp-subagent-backend.i18n.yaml # .agents/notes/implemented/feature/2026-06-22-acp-subagent-backend.zh.md # .agents/notes/implemented/feature/2026-06-25-ask-user-question.i18n.yaml # .agents/notes/implemented/feature/2026-06-25-ask-user-question.zh.md # .agents/notes/implemented/feature/2026-06-29-todo-write-tool.i18n.yaml # .agents/notes/implemented/feature/2026-06-29-todo-write-tool.zh.md # .agents/notes/implemented/feature/2026-06-30-hook-bridges.i18n.yaml # .agents/notes/implemented/feature/2026-06-30-hook-bridges.zh.md # .agents/notes/implemented/feature/2026-06-30-hook-protocol-lib.i18n.yaml # .agents/notes/implemented/feature/2026-06-30-hook-protocol-lib.zh.md # .agents/notes/implemented/feature/2026-06-30-interception-seams.i18n.yaml # .agents/notes/implemented/feature/2026-06-30-interception-seams.zh.md # .agents/notes/implemented/feature/2026-06-30-session-store-fork-api.i18n.yaml # .agents/notes/implemented/feature/2026-06-30-session-store-fork-api.zh.md # .agents/notes/implemented/feature/2026-06-30-subagent-observe-enrich.i18n.yaml # .agents/notes/implemented/feature/2026-06-30-subagent-observe-enrich.zh.md # .agents/notes/implemented/feature/2026-07-05-dynamic-workflows.i18n.yaml # .agents/notes/implemented/feature/2026-07-05-dynamic-workflows.zh.md # .agents/notes/implemented/feature/2026-07-05-skill-system.i18n.yaml # .agents/notes/implemented/feature/2026-07-05-skill-system.zh.md # .agents/notes/implemented/feature/2026-07-06-approval-seam.i18n.yaml # .agents/notes/implemented/feature/2026-07-06-approval-seam.zh.md # .agents/notes/implemented/feature/2026-07-06-explicit-tool-order.i18n.yaml # .agents/notes/implemented/feature/2026-07-06-explicit-tool-order.zh.md # .agents/notes/implemented/feature/2026-07-06-sandbox.i18n.yaml # .agents/notes/implemented/feature/2026-07-06-sandbox.zh.md # .agents/notes/implemented/feature/2026-07-07-mcp-client-plugin.i18n.yaml # .agents/notes/implemented/feature/2026-07-07-mcp-client-plugin.zh.md # .agents/notes/implemented/feature/2026-07-07-session-prefix.i18n.yaml # .agents/notes/implemented/feature/2026-07-07-session-prefix.zh.md # .agents/notes/implemented/feature/2026-07-08-repeat-tool-guard.i18n.yaml # .agents/notes/implemented/feature/2026-07-08-repeat-tool-guard.zh.md # .agents/notes/implemented/feature/2026-07-08-self-referential-cordis-toolset.i18n.yaml # .agents/notes/implemented/feature/2026-07-08-self-referential-cordis-toolset.zh.md # .agents/notes/implemented/feature/2026-07-10-session-query-service.i18n.yaml # .agents/notes/implemented/feature/2026-07-10-session-query-service.zh.md # .agents/notes/implemented/feature/2026-07-12-subagent-persona-tool-filter-and-depth.i18n.yaml # .agents/notes/implemented/feature/2026-07-12-subagent-persona-tool-filter-and-depth.zh.md # .agents/notes/implemented/process/2026-06-11-doc-sync-enforcement.i18n.yaml # .agents/notes/implemented/process/2026-06-11-doc-sync-enforcement.zh.md # .agents/notes/implemented/process/2026-06-11-quality-gates.i18n.yaml # .agents/notes/implemented/process/2026-06-11-quality-gates.md # .agents/notes/implemented/process/2026-06-11-quality-gates.zh.md # .agents/notes/implemented/process/2026-06-11-tsdown-over-dumble.i18n.yaml # .agents/notes/implemented/process/2026-06-11-tsdown-over-dumble.zh.md # .agents/notes/implemented/process/2026-06-11-vendor-cordis-as-source.i18n.yaml # .agents/notes/implemented/process/2026-06-11-vendor-cordis-as-source.zh.md # .agents/notes/implemented/process/2026-06-16-pnpm-over-yarn.i18n.yaml # .agents/notes/implemented/process/2026-06-16-pnpm-over-yarn.zh.md # .agents/notes/implemented/process/2026-06-17-ts-build-config.i18n.yaml # .agents/notes/implemented/process/2026-06-17-ts-build-config.zh.md # .agents/notes/implemented/process/2026-06-18-markdown-cross-link-lint.i18n.yaml # .agents/notes/implemented/process/2026-06-18-markdown-cross-link-lint.zh.md # .agents/notes/implemented/process/2026-06-20-core-data-structures-catalog.i18n.yaml # .agents/notes/implemented/process/2026-06-20-core-data-structures-catalog.zh.md # .agents/notes/implemented/process/2026-06-20-generated-cordis-catalog.i18n.yaml # .agents/notes/implemented/process/2026-06-20-generated-cordis-catalog.zh.md # .agents/notes/implemented/process/2026-06-20-rfc-classification.i18n.yaml # .agents/notes/implemented/process/2026-06-20-rfc-classification.zh.md # .agents/notes/implemented/process/2026-07-02-tool-schema-catalog.i18n.yaml # .agents/notes/implemented/process/2026-07-02-tool-schema-catalog.zh.md # .agents/notes/implemented/process/2026-07-03-documentation-graph-atlas.i18n.yaml # .agents/notes/implemented/process/2026-07-03-documentation-graph-atlas.zh.md # .agents/notes/implemented/process/2026-07-04-cordis-jsdoc-completeness-gate.i18n.yaml # .agents/notes/implemented/process/2026-07-04-cordis-jsdoc-completeness-gate.zh.md # .agents/notes/implemented/process/2026-07-04-doc-tiers-and-budgets.i18n.yaml # .agents/notes/implemented/process/2026-07-04-doc-tiers-and-budgets.zh.md # .agents/notes/implemented/process/2026-07-04-generate-rfc-index-tables.i18n.yaml # 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.agents/notes/proposed/feature/2026-07-13-stream-workflow-progress-through-tool-calls.i18n.yaml # .agents/notes/proposed/feature/2026-07-13-stream-workflow-progress-through-tool-calls.zh.md # .agents/notes/proposed/process/2026-06-11-api-extractor-reports.i18n.yaml # .agents/notes/proposed/process/2026-06-11-api-extractor-reports.md # .agents/notes/proposed/process/2026-06-11-api-extractor-reports.zh.md # .agents/notes/proposed/process/2026-06-11-architectural-conformance.i18n.yaml # .agents/notes/proposed/process/2026-06-11-architectural-conformance.zh.md # .agents/notes/proposed/process/2026-06-11-supply-chain-and-vendor-drift.i18n.yaml # .agents/notes/proposed/process/2026-06-11-supply-chain-and-vendor-drift.zh.md # .agents/notes/proposed/process/2026-06-20-discover-package-inventory.i18n.yaml # .agents/notes/proposed/process/2026-06-20-discover-package-inventory.zh.md # .agents/notes/proposed/simplification/2026-06-20-unify-agent-and-session-id.i18n.yaml # .agents/notes/proposed/simplification/2026-06-20-unify-agent-and-session-id.zh.md # .agents/notes/proposed/simplification/2026-07-04-prune-dead-core-spine-surface.i18n.yaml # .agents/notes/proposed/simplification/2026-07-04-prune-dead-core-spine-surface.zh.md # .agents/notes/proposed/simplification/2026-07-12-simplify-session-log-representation.i18n.yaml # .agents/notes/proposed/simplification/2026-07-12-simplify-session-log-representation.zh.md # .agents/notes/proposed/testing/2026-06-11-deterministic-and-stress-testing.i18n.yaml # .agents/notes/proposed/testing/2026-06-11-deterministic-and-stress-testing.zh.md # .agents/notes/proposed/testing/2026-06-11-mutation-testing.i18n.yaml # .agents/notes/proposed/testing/2026-06-11-mutation-testing.zh.md # .agents/notes/rejected/architecture/2026-06-11-immutable-public-surfaces.i18n.yaml # .agents/notes/rejected/architecture/2026-06-11-immutable-public-surfaces.zh.md # .agents/notes/rejected/architecture/2026-06-20-providerless-example-base.i18n.yaml # .agents/notes/rejected/architecture/2026-06-20-providerless-example-base.zh.md # .agents/notes/rejected/simplification/2026-06-20-assembled-assistant-messages-only.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-assembled-assistant-messages-only.zh.md # .agents/notes/rejected/simplification/2026-06-20-drop-acp-session-load.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-drop-acp-session-load.zh.md # .agents/notes/rejected/simplification/2026-06-20-drop-acp-terminal-meta.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-drop-acp-terminal-meta.zh.md # .agents/notes/rejected/simplification/2026-06-20-drop-bash-output-spill-files.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-drop-bash-output-spill-files.zh.md # .agents/notes/rejected/simplification/2026-06-20-drop-durable-step-boundaries.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-drop-durable-step-boundaries.zh.md # .agents/notes/rejected/simplification/2026-06-20-drop-unused-session-lineage.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-drop-unused-session-lineage.zh.md # .agents/notes/rejected/simplification/2026-06-20-fold-session-persistence-interface.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-fold-session-persistence-interface.zh.md # .agents/notes/rejected/simplification/2026-06-20-generic-tool-rendering.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-generic-tool-rendering.zh.md # .agents/notes/rejected/simplification/2026-06-20-retire-mid-turn-steering.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-retire-mid-turn-steering.zh.md # .agents/notes/rejected/simplification/2026-06-20-single-session-acp-bridge.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-single-session-acp-bridge.zh.md # .agents/notes/rejected/simplification/2026-06-20-truncate-interrupted-turns.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-truncate-interrupted-turns.zh.md # .agents/notes/rejected/simplification/2026-07-04-prune-unimplemented-subagent-vocabulary.i18n.yaml # .agents/notes/rejected/simplification/2026-07-04-prune-unimplemented-subagent-vocabulary.zh.md # .agents/notes/rejected/simplification/2026-07-12-collapse-workflow-to-foreground-core.i18n.yaml # .agents/notes/rejected/simplification/2026-07-12-collapse-workflow-to-foreground-core.zh.md # .agents/notes/rejected/simplification/2026-07-12-prune-unused-skill-registry-surface.i18n.yaml # .agents/notes/rejected/simplification/2026-07-12-prune-unused-skill-registry-surface.zh.md # docs/rfc/implemented/architecture/2026-06-18-agent-lifecycle-and-ownership-seams.md # docs/rfc/implemented/architecture/2026-06-18-session-surface.md # docs/rfc/implemented/architecture/2026-06-20-branded-ids.md # docs/rfc/implemented/architecture/2026-07-02-fs-per-session-cwd.md # docs/rfc/implemented/feature/2026-06-18-compaction-capability-seam.md # docs/rfc/implemented/feature/2026-07-07-session-prefix.md # docs/rfc/implemented/process/2026-06-20-rfc-classification.md # docs/rfc/implemented/process/2026-07-04-generate-rfc-index-tables.md # docs/rfc/implemented/process/2026-07-05-uniform-rfc-format.md # docs/rfc/implemented/process/2026-07-06-parallel-github-ci-gates.md # docs/rfc/implemented/process/2026-07-06-parallel-pre-push-gates.md # docs/rfc/implemented/process/2026-07-12-package-model-experience-contract.md # docs/rfc/implemented/simplification/2026-06-20-remove-agent-boundary-mirror-events.md # docs/rfc/implemented/simplification/2026-07-04-prune-producerless-vocabulary-variants.md # docs/rfc/implemented/testing/2026-06-20-remove-redundant-snapshot-log-goldens.md # docs/rfc/implemented/testing/2026-07-08-shared-acp-snapshot-package.md # docs/rfc/proposed/architecture/2026-06-20-generic-long-running-tool-runtime.md # docs/rfc/proposed/simplification/2026-06-20-unify-agent-and-session-id.md # docs/rfc/proposed/simplification/2026-07-12-simplify-session-log-representation.md # docs/rfc/rejected/simplification/2026-07-04-prune-unimplemented-subagent-vocabulary.md # scripts/translation-pairing.manifest.json
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Tianyi Cui
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# RFC: 会话持久化作为基于现有 `SessionEvent` 的抽象服务
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Status: implemented
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[English](2026-06-14-session-persistence.md) | 中文
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## 问题
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会话此前仅存在于内存中。示例插件 `session-jsonl.ts`（在两个示例中逐字节重复）是只写的遥测：它缓冲 `session/event` 并追加 JSON 行，没有读取/回放路径，没有崩溃安全性（无 fsync、无原子写入、fire-and-forget 的 dispose 排空），没有列表功能，也没有格式版本控制。没有任何机制能将磁盘上的历史会话重新注入到活跃的 agent（智能体）中，因此持久恢复（"继续昨天的任务"）、持久 fork 以及 ACP（Agent Client Protocol）的 `session/load` 方法（[ACP 支持](../../implemented/feature/2026-06-14-acp-agent-client-protocol.md)）都无法实现。
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[事件溯源模型](2026-06-11-event-sourced-sessions.md)将仅追加日志作为唯一真源，并从中派生 LLM（大语言模型）历史。持久化必须忠实于这一设计：直接持久化现有的 `SessionEvent`，不引入需要来回转换的并行"持久化消息"类型。后端也必须可替换——当前用文件存储，以后用数据库存储——统一在一个接口之后。
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## 决策
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持久化是一个抽象的**能力 seam**（[能力 seam](2026-06-13-capability-seams.md)，`dsh-bash` 模板），而非循环或核心逻辑：
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1. **接口**（`dsh-session-persistence`，`ctx.sessionPersistence`）：一个抽象的 `SessionPersistence` 服务，提供 `create`/`append`/`load`/`list`。其持久化单元就是现有的 `SessionEvent`（`{ type, seq, time, data }`），原样复用，无转换类型。
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2. **实现**（`dsh-session-persistence-jsonl`）：每个会话一个仅追加的 JSONL 日志（一行 `SessionHeader`，之后每行一个 `SessionEvent`，逐字节保留，**包括 `assistant/chunk`**）。
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以下关键选择记录于此，因为它们是持久性的、有争议的、且出人意料的：
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- **规范的持久日志逐字节保留每个 `SessionEvent`，包括 `assistant/chunk`。** `deriveMessages()` 跳过 chunk，而过滤 chunk 的方案（Codex 的 `policy.rs`）很有吸引力，但 `seq = log.length` 以及加载验证 `events[i].seq === i` 要求日志是*连续*的；过滤掉 chunk 会留下空洞，同时破坏契约和恢复功能。基于 chunk 过滤的投影可以作为派生视图在后续实现（带有自己的重新编号），但它不是规范日志。
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- **仅追加；崩溃的轮次被关闭，而非截断。** 已刷写到 `turn/end` 的事件永不被重写，且循环仅在轮次结束时刷写。由于一个被中断的轮次可能包含大量有效工作，`load` 保留其连续、可解析的事件，并为未应答的工具调用追加错误结果、补一个缺失的 `step/end`，以及带 `{ kind: 'interrupted' }` 的 `turn/end`。合成的结果保证恢复后的 provider transcript（文本记录）仍然有效。只有不完整的最后一条记录会被丢弃；在最后一个真实 `turn/end` 处或之前出现解析错误或序号间隙，属于数据损坏，会使该会话不可加载。
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- **文件后端为规范实现，数据库后端为经过验证的直接替换。** `SessionEvent` 1:1 映射到一行 `(session_id, seq, type, time, data)`：`append` 是 INSERT（在一个断言连续 seq 契约的事务中），`load` 是 SELECT … ORDER BY seq。`dsh-session-persistence-sqlite` 正是如此：一个 `SessionPersistence` 子类，接口无变化（opencode 在 SQLite/WAL 上运行的正是这个形状），且通过与 JSONL 后端相同的 `runPersistenceContract` 测试套件。该契约以相同的语义约束两个后端（惰性物化、加载时关闭中断轮次、连续 seq），一次表达在文件字节上，一次表达在数据库行上。
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- **元数据在日志之外。** 格式版本、cwd 和谱系是存储关注点，不是可回放的对话状态，因此它们存放在 `dsh-session` 拥有的 `SessionHeader` 中，并通过新的只读属性 `session.header` 附加到 `Session` 上——永远不进入 `SessionEventMap`，永远不到达 `deriveMessages()`。替代方案（一个可合并扩展的 `session/meta` 事件作为日志第 0 行）被否决：日志内事件会随 seed/fork 的会话免费携带，但元数据不是可回放状态，因此显式的日志外 header seam 是更干净的代价。（header 最初被拆分为不可变的 `SessionHeader` 加可变的 `SessionSummary`，二者的联合类型为 `SessionMeta`；可变 summary 后来因属于死状态而被移除——见 [移除可变会话摘要](../simplification/2026-06-19-drop-mutable-session-summary.md)。）
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- **`ctx.agents.create()` 和 `ctx.agents.resume()` 是异步工厂；resume 还跨越持久化边界。** `ctx.agents.resume({ resumeSessionId })` 等待 `ctx.sessionPersistence.load`，用加载的事件重建活跃会话（使 `lastTurnNumber`/`deriveMessages` 得以延续），并在恢复的 id 上启动一个新 agent（不是 `${agentId}-session`）。agent loop（智能体循环）不会硬注入 `sessionPersistence`（那样会让非持久化的演示永远挂起）；当它不存在时，`resume` 以明确的错误拒绝。
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## 曾考虑的替代方案
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上述每个关键选择都在陈述处记录了被否决的替代方案：**过滤 chunk 的规范日志**（Codex 的 `policy.rs` 形式）破坏连续 seq 契约；**截断崩溃的轮次**会静默销毁长时间自主运行中的真实工作；**日志内 `session/meta` 事件作为第 0 行**——元数据不是可回放状态；**将 `sessionPersistence` 硬注入循环**会让非持久化的演示永远挂起。
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格式版本控制：header 携带一个 `version`；`load` 拒绝任何非当前版本（不做迁移——预发布阶段的会话格式固定为 `SESSION_FORMAT_VERSION = 0` 并吸收形状变动，遵循 AGENTS.md 的预发布立场）。坦率地说：仅追加 + 刷写对部分尾部写入是健壮的（加载时容忍），但对行写入中途的无 fsync 断电不健壮；数据库/WAL 后端是后续更强的选项。
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## 后果
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新增两个包（package），以及 `dsh-session` 中的元数据 seam（`session.header`，`create(id?, options?)` 签名）。收益：持久恢复/fork、读取/回放路径、崩溃容忍，以及 ACP `session/load`（[ACP 支持](../../implemented/feature/2026-06-14-acp-agent-client-protocol.md)）所需的基础——全部基于现有的事件溯源日志，后端在一个接口之后可替换。可复用的 `runPersistenceContract` 测试套件以相同的仅追加、连续 seq、惰性物化与可序列化语义约束每个后端。持久化完整日志还确定了事件保真度：`assistant/chunk` 保持逐字节不变。
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