Validate sourced physical material property cards and elastic stability (#934)

Adds the read-only material.properties.validate command: schema_version 1 engineering material cards in SI units are checked for numerical consistency and elastic stability, with derived isotropic moduli, missing conditions and sources needing review. Nothing is assigned or saved.

Thanks @0xlillith.

crates/doc/src/lib.rs

@@ -30,6 +30,7 @@ pub mod motion;
 mod name_lookup;
 pub mod naming;
 mod params;
+pub mod physical_material;
 mod piece_names;
 mod profile_refs;
 pub mod progress;