Read a nameless file's content to tell whether it is text

A file whose name gives no type, such as a shebang script or a Makefile,
was refused as not text. When mimetypes knows nothing, the first 4 KB
decide: no NUL and valid UTF-8 (a character cut by the window allowed)
is text. A name that does say something, even application/octet-stream,
is still taken at its word.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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