Document \by_value\ FFI annotation - #598
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Pony's FFI passes all structs as pointers. ponyc PR #6062 adds a \by_value\ annotation that generates a wrapper so C functions expecting structs by value work without hand-written C shims.
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Document the
\by_value\FFI annotation from ponylang/ponyc#6062.Changes:
docs/c-ffi/calling-c.mdwith documentation of the new feature — passing structs by value, returning structs by value, and combining bothby_valueentry todocs/appendices/annotations.mdwith cross-references to the calling-c page\by_value\content\by_value\restrictionsMerging blocked on ponyc 0.73.0 release (ponylang/ponyc#6063).