The job description still advertised "Read a file's frontmatter as a dict",
but the answer is now rendered `key: value` lines — the dict only survives in
metadata. An LLM choosing between `frontmatter_read` and a whole-file `read`
would expect a dict it can index into and get prose instead.
This is the wording-alignment point raised on #397, applied here before
review rather than after.
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