Experimental: Replace pony_error() with error-flag returns#5002

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SeanTAllen wants to merge 2 commits intomainfrom

sean/error-flag-returns

Commits on Mar 10, 2026

Replace pony_error() with error-flag returns for Pony-to-Pony calls
SeanTAllen
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Remove exception infrastructure and Pony serialise package
SeanTAllen
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