Fix vignette: replace inefficient do.call/lapply/file.info pattern

[Copilot]

The function-comparisons vignette used a flawed base R equivalent for dir_info() — it omitted full.names = TRUE, causing file.info to fail unless the working directory happened to be "path", and unnecessarily used do.call(rbind, lapply(...)) despite file.info being vectorized.

Change

• vignettes/function-comparisons.Rmd: Replace the base R equivalent for dir_info("path"):

# Before (broken without correct working directory, unnecessarily verbose)
do.call(rbind, lapply(list.files("path"), file.info))

# After (correct and concise)
file.info(list.files("path", full.names = TRUE))

Original prompt

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This section details on the original issue you should resolve

<issue_title>vignette infelicity</issue_title>
<issue_description>The vignette includes this

do.call(rbind, lapply(list.files("path"), file.info))

However, this assumes the current working directory is path; moreover, base::file.info is already vectorized, so instead I'd recommend:

file.info(list.files("path", full.names = TRUE))

Thank you for considering.</issue_description>

<agent_instructions>Can you implement the sugggestion</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes vignette infelicity #508

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