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

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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terminal 44x18 buffer=normal length=18 base=0 viewport=0
terminal 44x18 buffer=normal length=24 base=6 viewport=6
lifecycle started=1 stopped=0 progress=inactive
title "DSH snapshot"
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0| " DEEPSEEK HARNESS"
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3| <blank>
4| "Assistant "
style 0-8 fg=bright-magenta bold underline
5| "Model wait 0.0s "
5| <blank>
6| "You "
style 0-2 fg=bright-magenta bold underline
7| "Old prompt with a long line that exercises "
8| "wrapping and stays visible after compaction."
9| <blank>
10| "● Tool / bash / Run the coverage gate"
style 0-36 fg=green
11| "$ pnpm run test:coverage "
style 0-23 dim
12| "/workspace/project "
style 0-17 dim
13| "packages/ui/tui 100% "
style 0-19 dim
14| "… +1 lines (Ctrl+O to expand) "
style 0-28 dim
15| "1 test skipped "
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16| "coverage complete "
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17| "[exit 0] "
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18| "Model wait 0.0s "
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6| <blank>
7| "Context · workspace-context"
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8| "Additional instructions from: "
style 0-43 dim
9| "nested/AGENTS.md "
style 0-15 dim
10| " "
11| "Render workspace context XML clearly. "
style 0-36 dim
12| <blank>
13| "/workspace/project (tui-staging) deepseek-v"
19| <blank>
20| "… earlier context was compacted … "
style 0-32 dim
21| <blank>
22| "/workspace/project (tui-staging) deepseek-v"
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14| " dsh > "
23| " dsh > "
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15-17| <blank>

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terminal 104x30 buffer=normal length=30 base=0 viewport=0
lifecycle started=1 stopped=0 progress=inactive
title "DSH snapshot"
cursor hidden column=7 viewportRow=13 bufferRow=13
cursor hidden column=7 viewportRow=22 bufferRow=22
buffer
0| " DEEPSEEK HARNESS"
style 1-8 fg=bright-magenta bold
@@ -13,25 +13,41 @@ buffer
3| <blank>
4| "Assistant "
style 0-8 fg=bright-magenta bold underline
5| "Model wait 0.0s "
5| <blank>
6| "You "
style 0-2 fg=bright-magenta bold underline
7| "Old prompt with a long line that exercises wrapping and stays visible after compaction. "
8| <blank>
9| "● Tool / bash / Run the coverage gate"
style 0-36 fg=green
10| "$ pnpm run test:coverage "
style 0-23 dim
11| "/workspace/project "
style 0-17 dim
12| "packages/ui/tui 100% "
style 0-19 dim
13| "… +1 lines (Ctrl+O to expand) "
style 0-28 dim
14| "1 test skipped "
style 0-13 dim
15| "coverage complete "
style 0-16 dim
16| "[exit 0] "
style 0-7 dim
17| "Model wait 0.0s "
style 0-14 dim
6| <blank>
7| "Context · workspace-context"
style 0-26 dim
8| "Additional instructions from: nested/AGENTS.md "
style 0-45 dim
9| " "
10| "Render workspace context XML clearly. "
style 0-36 dim
11| <blank>
12| "/workspace/project (tui-staging) deepseek-v4-flash ↑0 ↓0 0% context"
18| <blank>
19| "… earlier context was compacted … "
style 0-32 dim
20| <blank>
21| "/workspace/project (tui-staging) deepseek-v4-flash ↑0 ↓0 0% context"
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13| " dsh > "
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14-29| <blank>
23-29| <blank>

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terminal 80x24 buffer=normal length=24 base=0 viewport=0
lifecycle started=1 stopped=0 progress=inactive
title "DSH snapshot"
cursor hidden column=7 viewportRow=20 bufferRow=20
cursor hidden column=7 viewportRow=21 bufferRow=21
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0| " DEEPSEEK HARNESS"
style 1-8 fg=bright-magenta bold
@@ -16,35 +16,36 @@ buffer
5| <blank>
6| "You "
style 0-2 fg=bright-magenta bold underline
7| "Old prompt with a long line that exercises wrapping before compaction. "
8| <blank>
9| "● Tool / bash / Run the coverage gate"
7| "Old prompt with a long line that exercises wrapping and stays visible after "
8| "compaction. "
9| <blank>
10| "● Tool / bash / Run the coverage gate"
style 0-36 fg=green
10| "$ pnpm run test:coverage "
11| "$ pnpm run test:coverage "
style 0-23 dim
11| "/workspace/project "
12| "/workspace/project "
style 0-17 dim
12| "packages/ui/tui 100% "
13| "packages/ui/tui 100% "
style 0-19 dim
13| "… +1 lines (Ctrl+O to expand) "
14| "… +1 lines (Ctrl+O to expand) "
style 0-28 dim
14| "1 test skipped "
15| "1 test skipped "
style 0-13 dim
15| "coverage complete "
16| "coverage complete "
style 0-16 dim
16| "[exit 0] "
17| "[exit 0] "
style 0-7 dim
17| "Model wait 0.0s "
18| "Model wait 0.0s "
style 0-14 dim
18| <blank>
19| "/workspace/project (tui-staging) deepseek-v4-flash ↑0 ↓0 0% context"
19| <blank>
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21-23| <blank>
22-23| <blank>