fix(naming): config.ml merges every [defaults] block, like lang.ml

config.ml and lang.ml both parse the INI format through the same reader,
Colitur_kernel.Overlay_ini.parse_sections, but resolved a repeated
[section] header oppositely: lang.ml folds over every section sharing
a name, while config.ml used List.find_opt and silently discarded every
[defaults] block after the first. Two modules parsing one file format
must not disagree about what a duplicate section header means.

of_string now folds a single accumulator across every section named
[defaults], in file order, matching lang.ml's of_string shape. A
scalar key (lang/template/format) repeated across two blocks resolves
to the later value, consistent with the existing within-section
last-wins rule; overlay keeps accumulating across every block, not
only the first; and unknown_sections still excludes every [defaults]
block, merged or not, since merging it is the point.

config.mli's lang doc comment is extended to say the last-wins rule
holds across block boundaries too, cross-referencing lang.ml's own
duplicate-section policy so the two do not drift again unnoticed.

0 files changed, 0 insertions, 0 deletions