fix(activity): simplify outcome summaries and show three actions

[waleedlatif1]

Summary

• Remove aggregate failure counts from activity summaries while retaining individual failure details and stopped/skipped counts.
• Show three distinct action types before the remaining-action count, using the existing overflow handling across agents.

Type of Change

• Bug fix

Testing

831 targeted tests passed across activity rendering, tool descriptions, and transcript display. Cleanup review, type-check, lint, all 46 audits (including API boundary validation), and generated-artifact checks passed.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated
docs	Skipped		Sep 15, 2026 11:16pm UTC

[cubic-dev-ai]

No issues found across 3 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with the intended summary behavior covered across helper-level and rendered activity tests.

Summary

This PR simplifies grouped activity outcomes and increases the number of distinct actions shown before the overflow count.

• Removes aggregate failed counts while retaining stopped and skipped counts.
• Keeps individual failed tool entries available in expanded activity history.
• Raises the visible distinct-action limit from two to three.
• Updates helper and rendered-stream tests for the new summaries.

_{Reviews (1) · Last reviewed commit: "fix(activity): simplify outcome summarie..."}