fix: set buflisted and trigger filetype detection on loaded buffers

Buffers loaded via bufload() weren't visible to FormatBuffers (which
checks buflisted) and LSP wasn't attaching (no FileType event fired).

💘 Generated with Crush

Assisted-by: AWS Claude Opus 4.5 via Crush <crush@charm.land>
taigrrcommitted parent ba887640d93d3ce536975da0f52ae503eef7d791c2c66daBrowse files
1 file changed+6−0

Rendering diff…