RD-3: the validator accepts a foundation part's own findings stream

A foundation part keeps its old sections for good, its findings stream
among them; the trunk refused the new indexer manifest's
mesh-delivery-indexer-findings as outside the predefined forms.

Builds: design 47 G §529, A-30, A-146 (hq 618ad2b7)

Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h

modules/mesh-delivery-indexer/judge/rules.go

@@ -5571,12 +5571,15 @@ var streamsKeptUntilMoved = map[string][]string{
 	"mesh-delivery-forge-bridge": {"forge"},
 }
 
-// PredefinedFormProblems refuses each stream a module declares that streamsKeptUntilMoved does not name for it.
+// PredefinedFormProblems refuses each stream a module declares that streamsKeptUntilMoved does not name for it, but a
+// foundation part's.
 func PredefinedFormProblems(m catalogue.Manifest) []string {
 	var out []string
 	for _, s := range m.Streams {
 		// A stream that keeps its history is one of the bus's predefined forms (novox/hq ADR 0592 §6).
-		if !s.KeepsHistory() && !slices.Contains(streamsKeptUntilMoved[m.Module], s.Name) {
+		// A foundation part keeps its old sections for good, its streams among them: its findings stream
+		// `<module>-findings` (design 47 G §529, A-30, A-146).
+		if !s.KeepsHistory() && !slices.Contains(Foundation, m.Module) && !slices.Contains(streamsKeptUntilMoved[m.Module], s.Name) {
 			out = append(out, fmt.Sprintf("%s keeps the stream %q, outside the bus's predefined forms: keep it as a state, "+
 				"a log or an object store, which the runtime reads for the module's tools and others read by `reads`", m.Module, s.Name))
 		}

modules/mesh-delivery-indexer/judge/rules_test.go

@@ -5111,6 +5111,11 @@ func caseTwoModulesCannotDeclareOneStream(t *testing.T) {
 	if got := PredefinedFormProblems(catalogue.Manifest{Module: "mesh-mail", Streams: a.Streams}); len(got) != 0 {
 		t.Fatalf("a stream kept until it moves was refused: %v", got)
 	}
+	// A foundation part keeps its old sections for good: its findings stream is accepted (design 47 G §529, A-30, A-146).
+	findings := []catalogue.StreamDeclaration{{Name: "mesh-delivery-indexer-findings", Events: []string{"finding-written.*"}}}
+	if got := PredefinedFormProblems(catalogue.Manifest{Module: "mesh-delivery-indexer", Streams: findings}); len(got) != 0 {
+		t.Fatalf("a foundation part's findings stream was refused: %v", got)
+	}
 }
 
 // A seat name meaning two protocols is the failure nobody could diagnose afterwards.