chore: improve licensing

src/model/taxonomy.rs

@@ -1,12 +1,9 @@
+// SPDX-License-Identifier: Prosperity-3.0.0
+// Copyright Scientific Computing Studio
+// Source: https://git.scient.ing/education/coursebank
+
 //! The pedagogical vocabulary: levels, cognitive processes, error types, and
 //! workflow states.
-//!
-//! These are enums rather than strings on purpose. A typo in
-//! `cognitive_process` should fail to parse, not silently create a new category
-//! that then splits your coverage report in two. Just as importantly, the
-//! relation between a level and the processes that belong to it is encoded here
-//! in one place, so "level 3, cognitive_process: recall" is a validation error
-//! rather than a label that quietly contradicts itself.
 
 use std::fmt;