Mark the build modules moved, so a machine assigned them composes before the forge serves their entry (issue 1537)

modules/mesh-build-go/README.md

@@ -35,6 +35,11 @@ with `GOTOOLCHAIN=local`, `GOFLAGS=-mod=mod` and the module's cache directory. E
 environment built from scratch (`StepRunner`): `PATH`, `HOME` and what the step passes. Workspaces older than a day
 are removed.
 
+The account's ssh files (`files/forge`, `files/known_hosts`, `files/gitconfig`) are filled on the node by the
+provisioner's client from the module's entry of `forge-account` (the manifest says `moved`, ADR 0466 §4, ADR 0400 §5).
+The forge writes that entry only once the module has run and reported its key (ADR 0400 §2), so until then the client
+says it waits and the files are not written: a fetch cannot reach the forge before them (issue 1537).
+
 ## Test
 
 `build_go_test {workspace, level, packages?}` runs the tests of a fetched workspace by Go's convention, one level at a

modules/mesh-build-go/cmd/mesh-build-go/forge_test.go

@@ -23,6 +23,7 @@ const (
 )
 
 type forgeManifest struct {
+	Moved     bool             `json:"moved"`
 	Requires  []any            `json:"requires"`
 	State     []any            `json:"state"`
 	Resources []map[string]any `json:"resources"`
@@ -44,6 +45,16 @@ func readForgeManifest(t *testing.T) forgeManifest {
 	return m
 }
 
+// The forge files are filled on the node by the provisioner's client, never by the controller (ADR 0466 §4, ADR 0400
+// §5, issue 1537): the forge serves a module's entry only after the module has run and reported its key (ADR 0400
+// §2), so a controller filling them would refuse the machine until then, and the module could never run.
+func TestTheForgeFilesAreFilledOnTheNodeSoTheModuleCanRunBeforeItsEntry(t *testing.T) {
+	if !readForgeManifest(t).Moved {
+		t.Errorf("%s's manifest does not say \"moved\": true, so the controller fills its forge files and refuses "+
+			"every machine it is assigned to until the forge serves an entry it makes only after the module ran", forgeModule)
+	}
+}
+
 func forgeTemplate(t *testing.T, r map[string]any) string {
 	t.Helper()
 	name, _ := r["template"].(string)

modules/mesh-build-go/module.json

@@ -1,6 +1,7 @@
 {
   "module": "mesh-build-go",
   "version": "1",
+  "moved": true,
   "runs-as": "mesh-build-go",
   "capabilities": [
     "package-manager",