Run the test suite without -v so a failure shows in the build log (closes #414)

The Docker build cuts each step's log off at 2 MiB. script/test ran
go test -v, whose output for the whole suite passed that limit before
any failure was printed, so a red build showed no failing test. Without
-v, go test prints only the output of failing tests and one result
line per package. -race and the 90s per-package timeout are unchanged.

Model: opus-5-5

script/test

@@ -27,13 +27,17 @@
 # binaries build or run at once, each with at most eight parallel tests. Under
 # -race every test binary and every link costs a few hundred MB, so the
 # defaults (one per core) add up to several GB on a many-core host.
+#
+# No -v: the Docker build cuts each step's log off at 2 MiB, and verbose output
+# from the whole suite passes that before a failure is printed. Without it, go
+# test prints only the output of failing tests and one result line per package.
 set -eu
 
 ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
 
 main() {
     cd "$ROOT"
-    go test -v -race -p 4 -parallel 8 -timeout 90s ./...
+    go test -race -p 4 -parallel 8 -timeout 90s ./...
 }
 
 main "$@"