steve-downey / compile-time-scheme / 28564470244

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implement real mendler_fold and mendler_para combinators

Replace the hand-rolled recursive dispatch in mendler_run with a genuine
Mendler-style paramorphism. The interpreter logic is now an algebra passed
to the generic mendler_para combinator, receiving an opaque recurse function
rather than calling itself by name.

Add mendler_fold (Mendler catamorphism with context) and mendler_para
(Mendler paramorphism with context) to recursion_schemes.hpp. Both are
constexpr and generic over any Fix<F> type.

Update all blog posts and reference documentation to reflect the new
combinator-based architecture.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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