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99fdcfdff7
Extends the native Rust marshalling to sequences and optionals (the Rust
counterpart of the cpp_native increment): a field maps to Vec<T> / Option<T>,
the repr(C) mirror gains the matching `{ ptr, len }` / `{ present, value }`
fields, and `to_c` now returns a holder owning the CStrings + C-array backing
(Vec/CString live on the heap, so the C struct's raw pointers survive the move
and the call). `from_c` reads seq/Option back out via slice + present-flag.
Unblocks the timer's complex (seq-of-structs / seq-of-strings / two optionals)
and schedule (three struct params). Verified end-to-end — the demo round-trips
typed ComplexResponse / ScheduleResult.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>