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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# RFC: 源端拥有的会话不可变性与开发模式不变式
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Status: implemented
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[English](2026-06-11-dev-invariants-over-deep-readonly.md) | 中文
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## 问题
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会话日志需要两种不同的保护：对每条已存储事实的不可变所有权，以及对跨时间和服务 seam 的事实之间关系的检查。如果将二者混为一个可选的开发插件，生产环境的历史记录将失去保护；如果试图通过 TypeScript readonly 类型同时表达两者，既无法建立运行时边界，也无法描述关系规则。
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会话日志是回放、请求重建、持久化与用户可见历史的持久真源。会话包（package）外部的代码必须能检视历史，但不能保留一个可在之后改写历史的引用；从调用方接受的输入也不能继续连接到调用方拥有的可变对象。
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单个值的不可变性只是契约的一半。一份日志可以包含完全不可变的记录，但其序列、轮次/步骤嵌套、工具调用配对、作用域分发或重建的模型请求是错误的。这些规则涉及多条记录或多个服务，无法通过冻结单个对象来建立。
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TypeScript readonly 类型不是充分的运行时边界。它们在程序运行时消失，类型转换可以绕过它们，而递归的 `DeepReadonly<T>` 会扩散到每个日志和消息消费方，尽管某些下游请求处理 API 有意使用可变值。
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## 决策
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职责在始终启用的存储边界与可选的开发断言之间分离。
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### Session 拥有不可变历史
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`Session` 仅在一次递归遍历完成无损 JSON 快照的物化之后才接受事件。该遍历拒绝不支持的值，并产出进入日志的确切分离记录，因此验证与存储不会从有状态的 getter 观察到不同的值，也不会保留调用方拥有的嵌套引用。
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被接受的事件及其所有后代在发布前被深度冻结。`append()` 返回该拥有的冻结事件，`session/event` 观察者接收同一记录，`session.events` 返回冻结的数组快照。先前返回的数组不会因后续 append 而增长。种子记录在构造成功前经过相同的验证、快照与冻结边界。
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此保证属于 `Session` 而非可选监听器，因为每种组合都依赖可信的历史。无论是否注册了开发支持插件，生产部署、聚焦测试或自定义嵌入都获得相同的存储语义。
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### 派生请求保持分离
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`deriveMessages()` 将已记录的表面事件投影为分离的、深度冻结的 `Message` 对象，并返回一份新的数组快照。因此请求组装可以将派生历史与其他输入组合，而不会暴露一条回到日志的路径。缓存复用安全的不可变投影，而非为每次模型调用重新克隆完整历史。
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### 不变式插件检查关系
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`dsh-invariants` 是一个纯监听器的开发插件。它不冻结记录，没有配置；dispose（资源释放）仅移除其断言。它检查需要跟踪状态或观察另一个 seam 的规则，包括单调递增的序列号、轮次与步骤嵌套、工具调用/结果配对、合法的 agent（智能体）状态转换、主体正确的作用域分发，以及循环构建的请求与从其会话日志前缀重建的请求之间的等价性。
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当插件附加到已有或已播种的会话时，它回放不可变日志以重建跟踪状态。这使得在轮次中途热重载是安全的，同时不赋予插件对会话存储的所有权。
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## 曾考虑的替代方案
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### 全面的 deep-readonly 类型
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[被否决的不可变公共表面提案](../../rejected/architecture/2026-06-11-immutable-public-surfaces.md)会在公共日志和消息表面上应用递归 readonly 类型。这能提供编辑器反馈，但无法提供运行时保证：TypeScript 类型在运行时被擦除，插件代码可以通过类型转换绕过。它还会将 readonly 类型推入有意进行修改的消费方。在 `Session` 边界处的运行时所有权保护所有调用方，无需这种类型传播。
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### 仅在开发模式冻结
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仅当不变式插件安装时才冻结历史，会使核心保证依赖于组合方式。代码可能通过开发测试，却在生产环境或省略了该插件的聚焦组合中破坏历史。因此存储不可变性始终启用，而开销更大的关系检查则保持为可选的开发支持。
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### 仅在派生消息时克隆
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分离 `deriveMessages()` 能保护最常见的请求路径，但 `session.events` 的其他读取者、append 返回值和会话事件观察者仍能修改持久历史。日志必须保护自身的边界；派生投影是额外的隔离边界，而非替代品。
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## 后果
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- 每个被接受的实时或种子会话事件在任何观察者接收之前，都已从调用方拥有的输入中分离并深度不可变。
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- `session.events` 暴露稳定的不可变快照，而非私有的增长数组。
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- 请求侧的修改无法通过派生消息触及已存储的历史。
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- 开发构建可以启用关系断言而不改变存储行为；dispose 或省略该插件不会削弱日志不可变性。
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- `dsh-invariants` 没有 `Config` 表面，因为它没有可调节的行为。
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- 运行时边界对每个被接受的事件产生一次递归快照与冻结的开销；后续读取者和缓存投影复用已拥有的不可变记录。
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