Split out parsing stuff as well, and test it

crates/bls/Cargo.toml

@@ -1,6 +1,9 @@
+# This crate explicitly does not have uefi/uefi-raw dependencies,
+# so that the contents can be unit-testable on non-UEFI target hosts.
+# Do not add uefi or uefi-raw as dependencies.
 [package]
 name = "edera-sprout-bls"
-description = "Sprout BLS Utilities"
+description = "Sprout BLS Utilities (UEFI-free)"
 license.workspace = true
 version.workspace = true
 homepage.workspace = true