Function array_vshard_for_name 

pub fn array_vshard_for_name(array_name: &str) -> u32

Compute a vShard ID from an array name alone.

Array-specific name-only fallback used by array_sync paths that route before a coordinate or tile extent is known. Uses the same DJB multiply-31 hash as VShardId::from_collection_in_database, but without the database scope — array-sync messages carry their own scoping in the op-log header and route per-array by name.