ok
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`S name` is the string analogue of `[CHAR] x` and `['] name`: parses the
next whitespace-delimited token, state-smart.
Interpret: leaves ( c-addr u ) pointing into the input buffer.
Compile: appends run-time push of the copied bytes (identical code
to writing S" name" inline).
One line in boot.fth, leverages the existing PARSE-NAME + SLITERAL.
Zero runtime overhead inside : definitions.