Minor FFI hardening fixes#443

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kinetiknz wants to merge 7 commits intomasterfrom

get_indice_table

Commits on Mar 13, 2026

ffi: Perform cache insert before initializing `indices`.
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ffi: Reject out-of-range channel count and sample rate at the C boundary.
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ffi: Add null checks for out-pointers in get_indice_table and is_fragmented.
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ffi: Initialize AVIF output structs to defaults before populating.
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ffi: Reject timescales that don't fit in u32 instead of truncating.
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ffi: Assert that the read callback does not return more bytes than requested.
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ffi: Document that thread safety is the caller's responsibility.
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