Take the build agent and the toolchain images out of the catalogue's prose, and refuse the word where it comes back outside the one module still naming it (issue 1295, E6)

checks/words/buildagent_test.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"os"
+	"strings"
+	"testing"
+)
+
+// The build agent and the toolchain images are gone (novox/hq ADR 0524 §5, issue 1295 and E6 of milestone R4g): no text a module
+// can show names them. Where the word stands for a reason that is another lane's or still waits for its change, buildagent-allowed
+// names the module's directory with that reason and the date it is dated from; the list only shrinks: a directory on it that no
+// longer names the word is refused, so the line is taken out.
+var gone = []string{"build-agent", "build agent", "toolchain image"}
+
+func allowedModules(t *testing.T) map[string]string {
+	t.Helper()
+	raw, err := os.ReadFile("buildagent-allowed")
+	if err != nil {
+		t.Fatal(err)
+	}
+	out := map[string]string{}
+	for _, line := range strings.Split(string(raw), "\n") {
+		entry, why, _ := strings.Cut(line, "#")
+		if entry = strings.TrimSpace(entry); entry != "" && !strings.HasPrefix(line, "#") {
+			if strings.TrimSpace(why) == "" {
+				t.Fatalf("%q is allowed without a reason", entry)
+			}
+			out[entry] = strings.TrimSpace(why)
+		}
+	}
+	return out
+}
+
+func TestNoTextOfTheCatalogueNamesTheBuildAgentOutsideTheModulesAllowed(t *testing.T) {
+	texts, _, err := collect("../..")
+	if err != nil {
+		t.Fatal(err)
+	}
+	allowed := allowedModules(t)
+	seen := map[string]bool{}
+	for _, f := range check(gone, texts) {
+		module := f
+		if rest, ok := strings.CutPrefix(f, "modules/"); ok {
+			module = "modules/" + strings.SplitN(rest, "/", 2)[0]
+		}
+		if _, ok := allowed[module]; ok {
+			seen[module] = true
+			continue
+		}
+		t.Errorf("%s (the build agent and the toolchain images are gone: say what stands in their place)", f)
+	}
+	for module, why := range allowed {
+		if !seen[module] {
+			t.Errorf("buildagent-allowed names %s (%s), which names the word no more: take the line out, so it cannot come back", module, why)
+		}
+	}
+}