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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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16
packages/host/apiproxy/src/api-proxy.ts
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@@ -14,6 +14,7 @@ import type {
import { createUserMessage, ReasoningEffortId } from '@deepseek-ai/dsh-llm'
import { errorChain } from '@deepseek-ai/dsh-llm'
import type { MessageId, MessageSource } from '@deepseek-ai/dsh-llm'
import { isAppendSurfaceEvent } from '@deepseek-ai/dsh-session'
import type { Session, SessionEvent, SessionHeader, SessionId, UserMessage } from '@deepseek-ai/dsh-session'
import type { SessionPersistence } from '@deepseek-ai/dsh-session-persistence'
import type { Workspace, WorkspaceRecord } from '@deepseek-ai/dsh-workspace'
@@ -57,14 +58,17 @@ import { openNativePath } from './native-path-opener.ts'
/** Page size when history is called without maxMessages. */
const DEFAULT_MAX_MESSAGES = 50
/** Surface message event types (the pagination counting unit). */
/** Human message event types (the pagination counting unit). */
const MESSAGE_TYPES = new Set(['user/message', 'assistant/message', 'steering/message'])
/**
* Message-boundary pagination: count maxMessages surface messages backwards from
* the window tail; the cut is the starting seq of the oldest message group
* (chunks group via sourceEventSeqs — never cut mid-message). The tail page
* naturally includes the in-progress partial.
* Message-boundary pagination: count maxMessages append-origin human messages
* backwards from the window tail. Replacement copies are model-only, so they
* consume no quota; the page stays one contiguous raw range, which keeps a
* compaction's log-only provenance on the same page as its replacement. The cut
* is the starting seq of the oldest message group (chunks group via
* sourceEventSeqs — never cut mid-message). The tail page naturally includes the
* in-progress partial.
*/
function paginate(
events: readonly SessionEvent[],
@@ -76,7 +80,7 @@ function paginate(
let cut = 0
for (let i = window.length - 1; i >= 0; i--) {
const event = window[i] as SessionEvent
if (!MESSAGE_TYPES.has(event.type)) continue
if (!MESSAGE_TYPES.has(event.type) || !isAppendSurfaceEvent(event)) continue
count++
const sources = (event as { sourceEventSeqs?: number[] }).sourceEventSeqs
const groupStart = sources !== undefined && sources.length > 0 ? Math.min(event.seq, ...sources) : event.seq