ci: state where the nightly race and fuzz sweeps run

Assisted-by: GLM 5.3

.gitea/workflows/race.yml

@@ -1,11 +1,11 @@
-# Race, Go. Dispatched by hand, run nightly on a schedule, and run as part of
-# the release gates.
+# Race, Go. Dispatched by hand and swept nightly on a schedule.
 #
 # The race detector roughly doubles both time and memory, which the shared runner box
-# cannot afford on every push. Locally it belongs to `just gates`, which runs it once per
-# task; here it is an explicit decision rather than a routine. The schedule is the
-# nightly sweep: a failing race on development is known by morning without anyone
-# remembering to dispatch it.
+# cannot afford on every push. Locally it belongs to `just gates`, which runs it once
+# per task; here it is an explicit decision rather than a routine. The nightly
+# schedule runs on the repository's default branch, so it sweeps the released
+# line; development carries its race gate on every push through `just gates`
+# and the hand dispatch when a change asks for one.
 #
 # Every step is one command, so the step that fails is the gate that failed.
 name: Race