Rewrites `README.md` from scratch for #135, so that a newcomer can follow each sentence on one reading. It leads with what the program is and how to use it, then the reference, then development. Where the old text and the code disagreed, it states what the code does; #140 lists each point. Test comments that cited moved text cite the new headings. Review scope: full reviews through the 16th, then only text changed since. Dropped: the permission to add `github.com/spf13/viper`. Model: fable-5-1 (rewrite); opus-5-5 (review, landing message)
This commit was merged in pull request #140.
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