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feat(web): list background tasks in the session header

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The task registry has run every background bash, pwsh, pty-send, and
one-shot subagent since it landed, but only the model could read it: a
human at the Web client could not see that a build was running, tell a
finished task from a stuck one, or find its outcome anywhere but the
`run_in_background` tool card that printed an id and never updated.

Task state now reaches the browser as one whole-snapshot `session/tasks`
mux frame per session, pushed at every registry commit that changes what
that session can see. `TaskService` gains `onTasksChanged`, which is
owner-granular because owner-disposal removal is a change no per-task
record can express. The carrier reads the exact owner the listener hands
it, so a push stays correct while that scope tears down, and reads the
baseline through the non-resuming `ctx.agents.get` so listing never
revives a cold session. The client keeps a last-wins mirror on
`SessionListState`, and a new `dsh-client-ui-task` package renders it
beside the subagent catalog — rendering nothing at all until the session
has a task, so an ordinary conversation grows no new chrome.

Streamed per-task output and human-initiated cancellation are separate
phases; the note records why neither has to undo this channel, and why
no Web path may call the consuming `ctx.tasks.read()`.
This commit is contained in:
Yichen Jiang
2026-08-08 23:29:41 +08:00
parent 22609ea425
commit eab0aeb9db
93 changed files with 2130 additions and 68 deletions
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packages/client/README.md
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@@ -29,6 +29,7 @@ The browser side of the dsh web GUI: shell boot, browser-host communication, sha
| [`ui-slash/`](ui-slash/README.md) | Coordinates inline command and reference suggestions. |
| [`ui-skill/`](ui-skill/README.md) | Adds skill references to inline suggestions. |
| [`ui-subagent/`](ui-subagent/README.md) | Provides subagent navigation, child transcript states, and inline references. |
| [`ui-task/`](ui-task/README.md) | Lists this session's background tasks in the conversation header. |
| [`ui-model/`](ui-model/README.md) | Provides model selection in conversation surfaces. |
| [`ui-permission/`](ui-permission/README.md) | Configures default permissions and switches the current session's access. |
| [`ui-plan/`](ui-plan/README.md) | Presents active plan-mode status and its exit control. |