Reorganize paperspec commands and pin dependency versions (#2)

Reviewed-on: #2

docs/rationale.md

@@ -112,7 +112,7 @@ Only the three text values, `text_hash`, `match_hash` and `align_key`, normalize
 ### The character data is pinned to one Unicode version
 
 Normalization and General Categories change between Unicode versions, and both enter every hash.
-The chapters pin Unicode 16.0, the reference tools refuse to run on another version, and moving to a later one is a change to every text-hashing format ([spec/01 §1.4](../spec/01-conventions.md#14-text-normalization-for-hashing)).
+The chapters pin Unicode 16.0, the reference implementation refuses to import on another version, and moving to a later one is a change to every text-hashing format ([spec/01 §1.4](../spec/01-conventions.md#14-text-normalization-for-hashing)).
 
 ### Hashes that leave the team are keyed