Macro tensor_map 

macro_rules! tensor_map {
    ($name:expr, { $($from:literal => $to:literal),* $(,)? } $(, $fallback:expr)?) => { ... };
}

Table-driven exact match with a fallback closure for prefix/layer rules.

Example (TimesFM head):

const HEAD: &[(&str, &str)] = &[("a.weight", "b.weight")];
let out = zsfm_gguf::map_with_table("a.weight", HEAD);
assert_eq!(out.as_deref(), Some("b.weight"));