[docs] Update documentation for features from April 20, 2026

[github-actions]

Documentation Updates - April 20, 2026

This PR updates the documentation based on features merged in the last 24 hours.

Features Documented

• update-branch option for update-pull-request safe output (from feat: add update-branch support to safe-outputs update-pull-request #27244)
• ignore-missing-branch-failure option for push-to-pull-request-branch safe output (from Handle deleted PR branches in push-to-pull-request-branch with opt-in skip mode #27208)
• activity_report maintenance operation for the agentic maintenance workflow (from Add activity_report operation to agentic maintenance workflow #27212)

📝 Detailed Changes & References

Changes Made

• Updated docs/src/content/docs/reference/safe-outputs-pull-requests.md:

  • Added update-branch: false to the update-pull-request YAML example
  • Added paragraph explaining update-branch semantics and that it requires contents: write
  • Added ignore-missing-branch-failure: false to the push-to-pull-request-branch YAML example
  • Added paragraph explaining ignore-missing-branch-failure skip-on-missing-branch behavior

• Updated docs/src/content/docs/guides/ephemerals.md:

  • Added activity_report row to the maintenance operations table
  • Added activity_report bullet in the operation details section

• Updated docs/src/content/docs/guides/self-hosted-runners.md:

  • Added activity_report to the list of agentics-maintenance.yml jobs

Merged PRs Referenced

• feat: add update-branch support to safe-outputs update-pull-request #27244 - feat: add update-branch support to safe-outputs update-pull-request
• Handle deleted PR branches in push-to-pull-request-branch with opt-in skip mode #27208 - Handle deleted PR branches in push-to-pull-request-branch with opt-in skip mode
• Add activity_report operation to agentic maintenance workflow #27212 - Add activity_report operation to agentic maintenance workflow

Skipped Issues

• Add WorkQueueOps and BatchOps doc pages under design patterns #22001 - WorkQueueOps and BatchOps doc pages — requires authoring new design-pattern pages; out of scope for this automated run
• Meet the workflows points to specific versions, need to keep these up to date #20391 - Version links in "Meet the workflows" docs — requires infrastructure/tooling changes to automate version link updates
• Provider-based authentication for Claude, Copilot, Codex. #16498 - Provider-based auth for Claude, Copilot, Codex — requires broader feature documentation not yet fully implemented

Notes

PR #27220 (fallback-as-pull-request for push-to-pull-request-branch) was already documented as part of the merged PR itself — no further updates needed.

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• expires on Apr 21, 2026, 11:14 AM UTC