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docs: reserve seam for complete capabilities

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2026-08-09 15:34:32 +08:00
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packages/session/session-projection/README.md
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English | [中文](README.zh.md)
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.
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.
## Service: `SessionProjectionRegistry` (ctx key: `sessionProjections`)
@@ -25,11 +25,11 @@ Session-projection seam. It owns `ctx.sessionProjections`, the registry that dri
- **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.
- **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.
- **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.
- **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.
- **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.
## Role
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.
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.
## Model Experience