E2E expansion phase 5: stateful safe-output variants #16260

Goal

Add high-value variants of existing safe outputs where correctness depends on live GitHub state, event context, permissions, branch identity, or cross-repository behavior.

Candidate tests

• Suggested test: copilot/add-labels-target-restriction #15092 — add-labels target restrictions; prove a model-supplied item cannot escape the configured target.
• Suggested test: copilot/push-to-pull-request-branch-no-fallback #14833 — branch push without fallback; verify direct PR-branch updates with fallback-as-pull-request: false.
• Suggested test: copilot/dispatch-workflow-issue-comment-ref-resolution #12713 — dispatch ref resolution from a PR comment; assert the PR head, not the default branch, is dispatched.
• Suggested test: copilot/dispatch-workflow-ref-override #10528 — dispatch-workflow per-call ref override; verify the worker runs at the requested ref.
• Suggested test: copilot/create-pull-request-auto-merge-strategy #10527 — create-PR auto-merge strategy; verify GitHub records the configured merge method.
• Suggested test: copilot/submit-pull-request-review-commit-id #9966 — review commit attribution; assert the review is pinned to the intended commit SHA.
• Suggested test: copilot/create-pull-request-with-labels #9241 — create-PR labels through field input; verify array-valued labels survive the tool transport.
• Suggested test: copilot/add-discussion-comment-dispatch #9063 — discussion comments under workflow dispatch; exercise explicit discussion targeting and permissions.
• Suggested test: copilot/create-pull-request-issues-disabled #7084 — cross-repo PR fallback when issues are disabled; validate fallback routing to the configured repository.
• Suggested test: copilot/create-pull-request-same-org-fork #17504 — same-organization fork PR creation; verify the head repository is disambiguated correctly.

Completion criteria

Assert both the intended state change and the important negative/security behavior. Reuse current PR, discussion, and side-repository fixtures where possible.

Re-ranked from all open suggested new test issues on 2026-10-24.