Card: the JSON locks only exist in revisions from before the tables

README.md

@@ -55,9 +55,8 @@ converts the tables to and from the JSON lock the runners read. Results and
 traces record that revision for reproduction. Model repository revisions remain
 immutable even when this dataset is updated.
 
-`fleet-lock.json` and `prototype-fleet.lock` are the same fleets as JSON, written
-by tmic next to the tables until the Transformers CI runner reads the tables. Do
-not edit them by hand.
+Revisions from before the tables hold the same fleets as JSON (`fleet-lock.json`,
+`prototype-fleet.lock`); tmic and the runner still read those for old pins.
 
 ```bash
 run-model-contracts --fixtures-only --fleet control