[docs] Update documentation for features from 2026-06-09

[github-actions]

Summary

Documentation-only update covering two reference pages: explains how gh-aw automatically derives the GitHub App installation owner from the workflow's effective checkout target when the field is omitted, and documents the new object form of hide-older-comments that accepts a match list so comments from additional named workflows can be minimised in the same pass.

Changes

docs/src/content/docs/reference/auth.mdx

• Added a new "Omitting owner" section.
• Describes the compile-time and runtime resolution path gh-aw uses to infer the GitHub App installation owner from the workflow's effective checkout target when owner is not explicitly set.

docs/src/content/docs/reference/safe-outputs.md

• Added documentation for the object form of hide-older-comments.
• Documents the match list field, which allows comments from additional named workflows to be minimised alongside the current workflow in a single pass.

Impact

Dimension	Assessment
Breaking change	No
Runtime behaviour	None — docs only
API / schema change	None
Test coverage required	No

Notes

• Single commit (43c4d19b7); no diff-stat data was provided, confirming the change is confined to the two documentation files above.
• No code, configuration, or schema files were modified.

Generated by PR Description Updater for issue #38098 · 85.6 AIC · ⌖ 12.7 AIC · ⊞ 19.6K · ◷