Seal the build agent the forge genesis raised, in place of the builder's npm-password (hq issue 121, ADR 0336)

The build agent declares neither the retired builder's npm-password own-secret
nor a serves setting, so the packages step handed its credential to nothing
and genesis's sdk step had no way to publish. The packages step now seals the
genesis-package-registry own-secret to build-agent: the forge on this node's
loopback, the port given for the package registry, its npm path, and the
mesh-builder account with its password. setFoundationSettings no longer gives
the builder a serves.port.

internal/bootstrap/ports.go

@@ -117,24 +117,6 @@ const busModulePort = 4222
 // PortsSetting is the controller's settings key for a module's given ports.
 const PortsSetting = "ports"
 
-// ServesSetting is the settings key that carries what a provider serves, inside the one binding a
-// module carries rather than resolves — the builder's package binding (novox/hq 04-ISSUES/085).
-//
-// **A port given at genesis has to be a setting wherever it is read, or something puts it back.**
-// The builder reaches the package registry through a binding written in its own manifest, because
-// at genesis no module yet provides `package-registry` and so there is nothing for the controller
-// to resolve it from. That binding used to be rewritten, as text, when the installer registered the
-// builder — which a later registration from the catalogue undid silently. Set as a node's setting
-// instead, it is held by the controller rather than by the manifest, so re-registering the builder
-// leaves it where it was.
-//
-// **A settings layer is the module's, not one resource's.** The controller lays it over every file
-// of that module which merges as JSON, so `serves` lands in the package binding only because that
-// binding is the builder's one mergeable file. A second mergeable file added to the builder would
-// be given a `serves` key too, meaning nothing to whatever reads it. Worth knowing before adding
-// one.
-const ServesSetting = "serves"
-
 // setFoundationSettings tells the controller the ports this node gave a foundation module — and,
 // on an adopted node, that the registry is reached from anywhere, as a node pulls from it before it
 // has a private-network address (novox/hq ADR 0100). Done after the module is registered and before
@@ -148,13 +130,8 @@ func setFoundationSettings(ctx context.Context, o Options, control controlPlane,
 	if o.Adopted && module == RegistryModule {
 		values["expose"] = map[string]string{strconv.Itoa(DefaultPorts().Registry): "anywhere"}
 	}
-	if packages := o.Ports.orDefaults().Packages; module == BuilderModule &&
-		packages != DefaultPorts().Packages {
-		// The one binding nothing resolves: the builder dials the forge by a number it carries.
-		// The rest of the binding — the provision, the forge it is from, the account it presents —
-		// is the manifest's and stays there.
-		values[ServesSetting] = map[string]int{"port": packages}
-	}
+	// No `serves` setting for the build agent: the port given for the package registry reaches it in
+	// the genesis document (novox/hq ADR 0336 §3), and from the binding once the registry binds.
 	if len(values) == 0 {
 		return nil
 	}