jackfirth / resyntax / #425

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Pull #790

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Introduce a string piece supertype

The pieces making up a string replacement's contents are now called
string pieces, with a string-piece struct supertype underneath both
kinds and a public string-piece? predicate. The pieces aren't
exclusively tied to replacements --- syntax-replacement uses their
spans directly when narrowing replacement focus --- so the
replacement-string-span operation is now string-piece-span, and
contracts say string-piece? instead of enumerating the two kinds.

Also converts copied-string from define-tuple-type to a plain struct,
matching inserted-string.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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