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Add a multi-SKIP case so the gfi-sweep summary-only rule can actually fail #1001

Description

@justinmclean

Summary

In the good-first-issue-sweep Step 3 eval suite, the field that checks SKIP issues are shown
as a count summary is true in all four cases, three of them vacuously. Add a case with
several SKIP issues so the rule has something to fail on.

Background

skip_count_shown_as_summary_only encodes a real presentation rule: SKIP issues must appear as
a count line, not as a list of titles and reasons. But of the four existing cases, only
case-2-mixed has any SKIP issues at all — and it has one. The output-spec says that when
there are no SKIP issues the field is true "vacuously satisfied", so the other three expect
true for free.

That means a model that always answers true passes the whole suite on this field, including
one that helpfully lists every skipped issue with its reason. The project's own guidance in
docs/education/eval-driven-development.md names this pattern under "All your cases expect the
same value".

The fix is a new case whose input has enough SKIP issues that listing them is the tempting
behaviour — five or six, with distinct-looking skip reasons.

Where to look

  • tools/skill-evals/evals/good-first-issue-sweep/step-3-present-proposals/fixtures/ — add a
    new case-5- directory here.
  • .../fixtures/case-2-mixed/report.md — the closest existing input to model yours on; it shows
    the classification-list format the step receives.
  • .../fixtures/case-2-mixed/expected.json — the eight fields your expected.json needs.
  • .../fixtures/output-spec.md — the definition of each field, including the vacuous-true rule.
  • tools/skill-evals/evals/good-first-issue-sweep/README.md — the case table to extend, and the
    case count to bump.

Acceptance criteria

  • A new case supplies at least five SKIP issues with distinct skip reasons, plus at least
    one READY issue so the rest of the output is exercised.
  • Its expected.json sets all eight fields from the output-spec.
  • The suite README lists the new case and its count is updated.
  • The suite still assembles: PYTHONPATH=tools/skill-evals/src python3 -m skill_evals.runner tools/skill-evals/evals/good-first-issue-sweep/ runs without error.

Estimated effort

~1-2 hours for someone new to the codebase; most of it is writing a realistic input.

Getting started

[How to contribute](https://github.com/apache/airflow-steward/blob/main/CONTRIBUTING.md#your-first-contribution)

This issue was drafted with the help of an AI-assisted tool and reviewed by a Magpie maintainer before posting. If anything here is unclear or looks wrong, say so on the issue: a real person is reading.

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