test(detector): cover the report branch for a detector with no blind …

[evkir]

…spots

Codecov found the only uncovered statement in eval_corpus: the else in render_report that says so when blind_subclasses comes back empty.

Two wrong answers were available. Deleting the branch, which a working detector reaches by definition and which W3 exists to make reachable. Or covering it with a mock, which proves the formatter can be called rather than that the product ever arrives there.

So it is exercised through the production path: a scorer that flags everything empties the blind list, and evaluate and render_report do the rest. The opposite case is asserted in the same commit, because a test that only ever sees one side of a branch cannot tell that the branch exists.

Mutation-tested, three mutants, all killed: both branches made to print the same text, the blind-subclass filter made to return nothing ever, and the else emptied. The second fails four tests, which is the right shape -- the blind list is quoted in the report, in the baseline pin, and in the subclass tally.

What this changes

How it was measured

Checklist

• ruff format --check cyberai/ tests/ and ruff check cyberai/ tests/ pass
• pytest -W ignore::DeprecationWarning -m "not slow and not smoke" passes
• New behaviour is covered by a test that fails without the change
• I have read CLA.md and I hereby sign the CLA

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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