pub fn compute_routing_id(context_id: &str) -> [u8; 32]Expand description
Computes the 32-byte routing ID for a broadcast context.
routing_id = SHA-256(context_id) where context_id is the raw bytes
of the lowercase hex-encoded context ID string, per spec section 5.14.6.
Normalizes to lowercase before hashing so that mixed-case IDs produce
the same routing ID.