Read the facts snapshot with mesh-sdk's go/facts, formats 1 and 2, and keep writing format 1 (issue 1390, 3 of 4)

The merge gate, the build seat's check and the facts writer import the snapshot's type from mesh-sdk (go/facts), whose reader takes formats 1 and 2 and refuses a newer one. The writer keeps writing format 1 (writtenFormat); moving it to 2 is a release of its own (novox/hq ADR 0456). A test shows the writer writes format 1, carries no grants or bindings, and the reader takes both formats and refuses a newer one.

cmd/mesh-controller/facts_test.go

@@ -8,7 +8,7 @@ import (
 	"testing"
 
 	"git.novox.be/novox/mesh-sdk/go/catalogue"
-	snapshot "github.com/novox/mesh-controller/internal/facts"
+	snapshot "git.novox.be/novox/mesh-sdk/go/facts"
 )
 
 // The facts snapshot (novox/hq to-be 45 §9): composed from the store, every machine under a pseudonym
@@ -68,6 +68,9 @@ func TestTheFactsCarryNoSecretNoAddressAndNoName(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
+	if f.Format != 1 {
+		t.Fatalf("the writer wrote format %d: it keeps format 1 until its own release moves it (issue 1390)", f.Format)
+	}
 	body, err := f.Encode()
 	if err != nil {
 		t.Fatal(err)