Keep Studio empty-events state honest

[Copilot]

Canonical issue

Linked automatically by the system.

Outcome

Completed Studio runs with events[] = [] no longer imply transcript evidence when only pack identity exists. The empty Events rail remains honest while preserving the existing pack architecture/artifacts export path.

Scope

• Included:
  • Empty-events copy: studioEventsEmptyMessage() now branches on transcript presence instead of always mentioning transcript.
  • Studio wiring: OneLoopStudio passes hasTranscript into the empty-state helper.
  • Regression coverage: adds the pack-only completed-run case so this copy cannot drift back.

  if (input.hasTranscript) {
    return 'This run has no extracted events. Transcript and pack identity stay on this page.';
  }
  return 'This run has no extracted events. Pack identity stays on this page.';

• Explicitly excluded:
  • Pack workbench promotion/export behavior
  • Transcript or event extraction logic
  • Unrelated web workspace typecheck failures outside this change

Risk

• Risk level: low
• Failure mode: Studio reverts to misleading empty-state copy for pack-only completed runs.
• Rollback: revert the hasTranscript branch in studioEventsEmptyMessage() and the caller wiring in OneLoopStudio.

Verification

Head SHA: 130d78a

• Focused tests — cd apps/web && npm test -- --run src/lib/__tests__/studio-pipeline-status.test.ts src/lib/__tests__/action-surface.test.ts src/store/__tests__/dashboard-store.test.ts
• Required CI
• Review threads resolved

Production evidence

Not applicable for this change set: UI copy/state behavior only; no production receipt or deploy evidence was required for acceptance.

Agent handoff

• One canonical issue is linked
• No competing PR implements the same issue
• Acceptance criteria are satisfied
• Required checks pass on the current head
• Human decision is requested only for product, security, irreversible infrastructure, or production approval

• Fixes Fix Studio workbench dead-end when events[] is empty #1693

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Project	Deployment	Actions	Updated
v0-uvai	Ready	Preview, v0	Sep 8, 2026 11:23pm UTC