Merge remote-tracking branch 'origin/stack/agent-profiles-1-seam' into stack/agent-profiles-3-wire
# Conflicts: # docs/module-graph.md # packages/host/apiproxy/src/api-proxy.ts # packages/host/apiproxy/tsconfig.json
This commit is contained in:
Yichen Jiang
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# side as of the last confirmed-consistent state. Both languages carry equal authority;
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# after editing either side, bring the other along and re-record with:
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# pnpm run verify-translation-pairing --write packages/session/session-projection/README.md
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README.md: a42e88c262915fc5e53cd72205079cbc8029a8df
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README.zh.md: 01b23a7152a509efab6e169043a823d49d6d9fde
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README.md: 2615b253999c798172168ec9d0232eb965b07fbc
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README.zh.md: 0712e9c7a61fbcf43939791b3e7cd24af6777c3a
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English | [中文](README.zh.md)
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Session-projection seam. It owns `ctx.sessionProjections`, the registry that drives every registered projection unit over committed session events and serves finished whole values to carriers, currently the api-proxy history tail page and `session/projection` push frame. A domain registers pure mathematics; the framework owns the drive. The [session-projection RFC](../../../.agents/notes/proposed/architecture/2026-07-27-session-projection-and-command-log.md) records the design rationale.
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Session-projection Service Definition and drive registry. It owns `ctx.sessionProjections`, the registry that drives every registered projection unit over committed session events and serves finished whole values to carriers, currently the api-proxy history tail page and `session/projection` push frame. A domain registers pure mathematics; the framework owns the drive. The [session-projection RFC](../../../.agents/notes/proposed/architecture/2026-07-27-session-projection-and-command-log.md) records the design rationale.
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## Service: `SessionProjectionRegistry` (ctx key: `sessionProjections`)
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- **Synchronous unit discipline.** `init`/`apply`/`view` MUST be synchronous; carriers read `snapshot()` in the same tick as their page slice, which is what makes `asOfSeq` one consistent cut. An accidentally-async `view` returns a Promise, which fails the boundary `schema.parse` loudly.
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- **State is plain JSON, `stateVersion` is its invalidation anchor.** The persisted projection cache stores `(sessionId, key, ver, seq, val)` rows; bump `stateVersion` whenever the state shape or the fold semantics change so stale rows are discarded instead of forward-applied into garbage.
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- **No wire vocabulary here.** The registry exposes only the change feed and the snapshot read face; carriers (api-proxy) mint their own frames (`session/projection`) and blocks from them.
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- **Optional seam.** Domain plugins register under `ctx.inject(['sessionProjections'], …)` so headless assemblies without the registry stay unaffected; carriers use `ctx.get('sessionProjections')` and omit their block/frames entirely when the registry is absent.
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- **Optional capability.** Domain plugins register under `ctx.inject(['sessionProjections'], …)` so headless assemblies without the registry stay unaffected; carriers use `ctx.get('sessionProjections')` and omit their block/frames entirely when the registry is absent.
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## Role
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This is the interface-plus-drive package of the capability-seam split: domain host plugins (e.g. `dsh-tool-todo`) contribute units, carriers (`dsh-host-apiproxy`) consume the snapshot and change feed, and neither knows the other.
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This package owns the Service Definition and drive roles of the capability seam: domain host plugins (e.g. `dsh-tool-todo`) contribute units, carriers (`dsh-host-apiproxy`) consume the snapshot and change feed, and neither knows the other.
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## Model Experience
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[English](README.md) | 中文
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会话投影 seam。它拥有 `ctx.sessionProjections`：该注册表在已提交的会话事件上驱动每个已注册的投影单元，并向载体提供完整的最终值，目前包括 api-proxy 历史尾页和 `session/projection` 推送帧。领域注册的只是纯数学；驱动权归框架。[session-projection RFC](../../../.agents/notes/proposed/architecture/2026-07-27-session-projection-and-command-log.md) 记录了设计理由。
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会话投影 Service Definition 与驱动注册表。它拥有 `ctx.sessionProjections`：该注册表在已提交的会话事件上驱动每个已注册的投影单元，并向载体提供完整的最终值，目前包括 api-proxy 历史尾页和 `session/projection` 推送帧。领域注册的只是纯数学；驱动权归框架。[session-projection RFC](../../../.agents/notes/proposed/architecture/2026-07-27-session-projection-and-command-log.md)记录了设计理由。
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## 服务：`SessionProjectionRegistry`（ctx 键：`sessionProjections`）
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- **单元的同步纪律。**`init`/`apply`/`view` 必须是同步的；载体在切出页面切片的同一 tick 内读取 `snapshot()`，`asOfSeq` 之所以是一个一致切面正系于此。误写成异步的 `view` 会返回 Promise，让边界的 `schema.parse` 当场大声失败。
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- **状态是纯 JSON，`stateVersion` 是其失效锚点。** 持久投影缓存（persisted projection cache）存储 `(sessionId, key, ver, seq, val)` 行；状态形状或折叠语义一旦变化就递增 `stateVersion`，使陈旧行被丢弃，而不是被正向 apply 成垃圾。
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- **本层没有协议词汇。** 注册表只暴露变更流与快照读取面；载体（api-proxy）据此自铸各自的帧（`session/projection`）与块。
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- **可选 seam。** 领域插件在 `ctx.inject(['sessionProjections'], …)` 下注册，因此不带注册表的 headless 组装完全不受影响；载体使用 `ctx.get('sessionProjections')`，注册表缺席时完全省略自己的块与帧。
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- **可选能力。** 领域插件在 `ctx.inject(['sessionProjections'], …)` 下注册，因此不带注册表的 headless 组装完全不受影响；载体使用 `ctx.get('sessionProjections')`，注册表缺席时完全省略自己的块与帧。
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## 职责
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这是能力 seam 拆分中「接口 + 驱动」的那个包：领域 host 插件（如 `dsh-tool-todo`）贡献单元，载体（`dsh-host-apiproxy`）消费快照与变更流，两侧互不相识。
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本包承担能力 seam 的 Service Definition 与驱动角色：领域 host 插件（如 `dsh-tool-todo`）贡献单元，载体（`dsh-host-apiproxy`）消费快照与变更流，两侧互不相识。
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## 模型体验
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/**
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* Session-projection seam: the merge-extensible `SessionProjectionMap` type
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* Service Definition and drive registry for the session-projection capability seam: the merge-extensible `SessionProjectionMap` type
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* table, the `ProjectionDefinition` state-driven computation unit contract,
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* and the `ctx.sessionProjections` registry that DRIVES every registered unit
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* forward eagerly over committed session events. Domain host plugins
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/** Checkpoint rows keyed by projection key (one session's persisted cache value). */
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export type ProjectionCheckpoint = Record<string, ProjectionCheckpointRow>
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/** Type-erased unit view the drive machinery works with (the register seam already proved the typed contract). */
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/** Type-erased unit view the drive machinery works with (the registration contract already proved the typed form). */
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interface ErasedDefinition {
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key: string
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schema: { parse(value: unknown): unknown }
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/**
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* Pure-type outlet of the session-projection seam: the one projection type
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* Pure-type outlet of the session-projection Service Definition: the one projection type
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* table, importable from client aggregates without dragging the host-side
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* cordis Context merges of the package root (dsh-agent → dsh-session). Domain
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* packages may declare-merge through either the package root or this outlet —
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