contracts: A25 — sync callbacks are handed to host modules by the application - #258
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…ation, never by importing the runtime Pins the A22 consequence explicitly: sync() is application machinery, and the host-module path to a synchronous guest callback is being handed the sync(exports.f) function by the deploying application — the StreamWriter handing pattern, verbatim.
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One-paragraph clarification of A25's placement rule, prompted by review: host impls import @polyengine/protocol at most (A22), so a host module that wants a synchronous guest callback is handed
sync(exports.f)by the application — same pattern as StreamWriter handing (A22). No behavior change; contract text only.Automerge armed.