A run keeps the inputs its flow declared at submit

Run.declared (migration 2e7ca7d10044) snapshots the declarations on submit
and import. The run detail's Inputs panel reads them, and a run from before
falls back to the flow's current declarations.

docs/concepts/runs.md

@@ -183,7 +183,8 @@ cached stages. Cancel active runs before retrying them.
 
 The **Runs** screen filters by flow, status or sweep. Each run shows its
 parameters, per-node timings and logs, traceback, metrics, artifacts and
-result.
+result. Its inputs are listed as the flow declared them when the run was
+submitted, and the ones it took from the flow are marked as defaults.
 
 Select two or more runs to compare curves and the parameters that differ.
 Plot against step, elapsed seconds or another metric from the same runs.