[lavaman131]

In Chat's workflow run card, "+N earlier" was static text, so clicking it did nothing on any run, live or ended. That includes the reported case of a finished run. It is now a real button that unfolds the run's whole stage list in a bounded list that scrolls inside the card.

What changes

• Run card (apps/web/src/chat/run-card.tsx, run-card.css)
  • "+N earlier" is a <button> with aria-expanded and aria-controls. Its accessible name is "Show N earlier stages" (the visible text stays "+N earlier"), and it becomes "Show fewer" once expanded.
  • Expanded, the stages go into a list named "All stages of ". The list is capped at min(15rem, 40dvh), scrolls internally with overscroll-behavior: contain, and is focusable so the keyboard can scroll it (the shared theme focus ring applies).
  • Stages still pass through displayStages over the whole run before folding, so parentIds links and the stopped-descendant rule hold on both sides of the fold.
  • A row whose earlier stages were all unreported still gets the button. Expanded, it says how many weren't reported.
• How omitted stages are handled (apps/server/src/harness/atomic/full.ts)
  • The truncation happened at the source: the Atomic harness listed only a run's latest 12 stages and counted the rest in earlierStages. Its in-memory fold has every stage only while the session lives, so there is nothing durable to fetch on expand.
  • The harness now keeps the latest 64 stages. That is the same cap the agent connection already enforces for a reported card (MAX_STAGES in packages/agent-link), so stored and broadcast cards stay within existing report limits.
  • Stages beyond 64 are still counted in earlierStages, and the expanded card says "N earlier stages were not reported".
  • The protocol and agent connection are unchanged. apps/connector is unchanged.
• Docs: docs/hosted-agent.md and docs/agent-connection.md describe the expand behavior and earlierStages.
• Test seeding: SeedState and the e2e seedChannel can store workflowRuns.

Tests (written red first)

• apps/web/src/chat/run-card.test.tsx:
  • the folded view and button markup
  • expanding shows every stage plus the unreported count
  • collapsing and short runs
  • nested stages keep their parents and stopped descendants on both sides of the fold
  • a run whose earlier stages were all unreported still offers the button
• apps/server/src/harness/atomic/full.test.ts: a 70-stage run lists its latest 64 and counts 6 earlier.
• e2e/run-card.e2e.ts (harness project, AGENT=on), at 1280×800 and on a 390×844 touch phone:
  • opens a finished run with 18 stages and 3 unreported, then taps or clicks "+15 earlier"
  • checks all 18 stages and the unreported note show in a list that scrolls, with no horizontal overflow
  • checks the list sits inside the card, the card inside Chat and the viewport, and the composer stays in view
  • End scrolls to the last stage without moving the card
  • "Show fewer" folds it back
  • the whole sequence is repeated after a reload
  • On the old card this test failed with "element(s) not found" for the button.

Verification

• GIT_CONFIG_GLOBAL=/dev/null bun test apps/web apps/server packages: 6016 pass, 8 skip, 0 fail
• bun run types: passed
• bun run ci: passed, with no design-contract hash renewals
• bun run e2e --project=harness: 36 passed. run-card.e2e.ts with --repeat-each=6 --retries=0: 12 passed.