#2938 feat(desktop): a transcript opens on its origin, sent by the automation, task, or agent it came from

Summary

Chain F, 2 of 3 (items 14–16). Stacked on #2933, which keeps the run on the agent.

What an agent was handed now opens its transcript as a message sent to it. It stands at the right like a sent message, under the sender line every teammate's message has. The card itself stays folded under its title and holds the prompt alone.

Transcript	Sender line	Pressing the sender
A task's agent	The task, by its document glyph and name, then "· started by ". The starter is never shown as the reader, matching today's message rule.	Opens the plan (the column's Plan tab). Its hover card is the task's sidebar card (planCardOf).
An automation's agent	The automation (ACT_KIND.AUTOMATION tile), then the pull request a GitHub event named, then "· Run by " for Run now.	Opens the automation's page. Its hover card is the existing AutomationCard. The pull request opens on GitHub.
A worker's tab	The agent that delegated it.	Opens that agent's tab and centres the delegation's row.

Special cases:

• Nothing to open. Where the window can't open the automation, the sender is plain text, with no press and no card. That covers a deleted automation ("Flaky test sweep (deleted)", the name F1 keeps), someone else's personal automation, and the Automations experiment being off.
• No Open button. Per Dean's tweak, the sender is the only link.
• Webhook body. It folds inside the card under its own "Webhook body" line. It is never in the sender line.
• Same-agent automations. Later runs still arrive as ordinary messages from the automation. Only the first message becomes the card.
• Nested origins. Only one hop: a worker names its parent agent, not the automation behind it.
• Find and Copy transcript. Both work unchanged. The card folds on the transcript's own Fold, which ⌘F already opens. Copy transcript still copies the whole brief.
• Agent page. The page now stands an AutomationDirectory for its agent's workspace, so the automation can be found and opened from there.

Renders: the real renderer in the show harness on Linux (fonts are SF Pro stand-ins, so ⌘ draws as a box), cropped to the transcript. The composer's lazily loaded editor isn't built in the harness, so it's cut off.

	Light	Dark
Code review on a pull request, card open
Run now
Webhook body folded inside the card
Deleted automation, plain
A teammate's task agent

CI runs on Linux only and could not verify this on the Mac.

Evidence

• pnpm check:affected: exit 0.
• pnpm exec vitest run --project desktop: 124 files and 944 tests passed, before the two lint-only test fixes.
• New tests. Each fails on main, where no .agent-origin card exists:
  • origin-senders.test.ts:
    • A task's agent opens on its plan sent by the task, with the teammate who started it; pressing the task opens the Plan tab.
    • The reader's own agent shows the task alone.
    • A worker's tab is sent by the parent agent; pressing it opens that agent's tab.
  • desktop-agent-page.test.ts:
    • An automation's agent shows the prompt alone, without Luke's lines; pressing the sender opens the automation's page.
    • A deleted automation is named plainly, and so is one whose experiment is off.
    • The GitHub subject link opens the pull request, and Run now reads "Run by you".
    • A webhook body stays inside the card's fold and out of the sender line.
• One existing test's selector now skips the origin card, since that card also has a sender line.

Invariants

• ./scripts/check.sh green. (CI)
• JSON Schema goldens unchanged.
• Every behavior change has, in this PR, the test that fails without it; no change-detector test added.
• Gateway envelope goldens unchanged.
• No new as type assertion.
• No Effect.run* outside the edges.
• No new raw async primitives (the worker's seek uses focusSeek).
• No discarded Effect.
• Test count: +8.
• No hand-rolled file replaced.
• No CLAUDE.md/AGENTS.md sentence names a changed part.
• PRIVACY.md unchanged. The webhook body is shown only in the run's transcript, which carve-out D10 allows, and the whole tab is already ph-no-capture.
• Package deps unchanged.
• Barrel/door rule unaffected.

Notes

• Copy-link workspace: told L12 that the origin card is PlanCard and that message ids are unchanged.

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