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fix(tui,host): project the human transcript from append-origin events

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The terminal and history pagination both treated the model-visible surface as
the human transcript. A landed compaction replacement therefore erased the
conversation it summarized — messages the reader had already seen — and a
model-only replacement copy consumed a page's `maxMessages` quota, which could
also split a compaction's provenance from the replacement citing it.

`dsh-session` now exports the marker split `isAppendSurfaceEvent` /
`isReplacementSurfaceEvent`. The terminal replays append-origin surface events,
keeps a shadowed step's tool cards paired through its append-origin assistant
message, and renders one dim marker where a compaction landed; the checkpoint is
recognized through the compaction seam's `isCompactCheckpointSource` contract,
not the shape of the replacement. `session.history` counts only append-origin
human messages. Everything model-facing keeps reading `session.surface`.
This commit is contained in:
Hypatia May
2026-07-29 16:13:36 +08:00
parent 59ecfac776
commit d9a11dc91e
33 changed files with 544 additions and 119 deletions
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8
packages/host/apiproxy/src/api/sessions.ts
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@@ -176,9 +176,11 @@ export interface SessionsApi {
Promise<RpcResponse<{ sessionId: SessionId }>>
/**
* Reads a window of history events; page boundaries align to message boundaries: one page =
* all raw events owned by a whole number of messages (including their chunk / tool events),
* never cut mid-message. The tail page (beforeSeq absent) additionally carries the in-flight
* Reads a window of history events; page boundaries align to append-origin human-message
* boundaries: one page = all raw events owned by a whole number of such messages (including
* their chunk / tool events), never cut mid-message. Model-only replacement copies consume no
* `maxMessages`, so a compaction's provenance stays on the page of its replacement. The tail
* page (beforeSeq absent) additionally carries the in-flight
* partial — chunk events already emitted for the last unfinalized message.
* Each entry pairs the raw SessionEvent with the host-computed view (tool events whose
* presenter produced one, evaluated against the registry at pagination time); the client