Function decode_known_chain_tips 

fn decode_known_chain_tips(
    chain_tip_hashes: Vec<Vec<u8>>,
) -> Result<HashSet<Hash>, Status>

Decodes the chain tip hashes from a NonFinalizedStateChangeRequest into a set of block::Hashes.

Each hash is expected to be 32 bytes in display order, matching the encoding used when the server streams BlockAndHash messages back to the caller.

Errors

Returns an invalid_argument status if there are more hashes than the non-finalized state can hold chains (MAX_NON_FINALIZED_CHAIN_FORKS), or if any hash is not exactly 32 bytes long.