Uncommitted 238-case --log test matrix #152

Finding (as written in the restart doc, ChatGPT batch 3): the 238-case --log matrix exists but is not committed.

Suggested fix: commit the matrix as a test (parametrised, with its expected outputs), run it in CI, and record its size in the test name or docstring.

Source: ChatGPT audit batch 3 (core), 2026-11-04; restart doc "Batch 3 FILE items".