ci(release): state the version contract inline

Assisted-by: GLM 5.3

.gitea/workflows/release.yml

@@ -5,9 +5,9 @@
 # even at its own <module>/vX.Y.Z tag and this workflow's smoke test can never pass for
 # it. A Go repository is one module at the root.
 #
-# The version contract these steps implement is in the `release` skill, and its point is
+# The version contract these steps implement: nothing is injected.  The toolchain records
-# that nothing is injected: the toolchain records the tag into the binary's build
+# the tag into the binary's build information, so the build simply has to happen at the
-# information, so the build simply has to happen at the tag, which the trigger guarantees.
+# tag, which the trigger guarantees.
 #
 # The gates run in their own job, once, before the matrix, minus the race detector: race
 # never runs on a push path or a tag, and the local gate raced this tree before the tag