a route composes its internal-network alias too, not only its public name

Every cutover done on novox tonight (drive, files, files-api, git,
keycloak, umami) dropped the <label>.<node>.internal alias HAL always
paired with the public hostname — found only when the operator tested it
by hand. Not a security boundary (a predecessor proxy served both as a
convenience, reaching a service over the VPN without a public TLS round
trip, not as access control), so restoring it is composing the same
convenience the same way the public name already is: <label> joined to
the node's own private address (r.At), independently of whether a public
domain exists to join the other half to.

composeName's signature changes (publicDomain, internalDomain) but its
shape does not — additive, label-gated, apex-aware, exactly mirroring the
public half it already did. A contribution the mesh writes both names
into is the entire fix; route-adapter and route-proxy pick up internal-
name whenever they're updated to serve it, not before, so this alone
changes nothing about what is live on any node yet.

internal/catalogue/routing_test.go

@@ -132,6 +132,72 @@ func TestALabelWithNoPublicDomainComposesNothing(t *testing.T) {
 	}
 }
 
+// withPrivateAddress is a workstation on the private network, at the given internal name — the
+// same fact a route's own consumers already receive as `${bound:...:at}`.
+func withPrivateAddress(at string) Node {
+	n := workstation()
+	n.At = at
+	return n
+}
+
+func TestALabelComposesWithTheNodesPrivateAddressToo(t *testing.T) {
+	// A predecessor proxy answered a route on both a public and a private-network hostname for the
+	// same convenience the mesh restores here: reaching a service over the VPN without a public TLS
+	// round trip. Composed independently of the public name, from the node's own `At`.
+	got, err := Resolve(shelf(proxy(), labelled("board", "git", 8080)),
+		[]string{"board"}, withPrivateAddress("anchor.internal"), World{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	given := received(t, mustDeclare(t, got))
+	if given[0].Values["internal-name"] != "git.anchor.internal" {
+		t.Fatalf("the label did not compose with the private address: %v", given[0].Values)
+	}
+}
+
+func TestThePublicAndInternalNamesComposeIndependently(t *testing.T) {
+	// A node with both a public domain and a private address gets both names from one label; a
+	// node with only one of the two gets only the matching one — neither composition depends on
+	// the other being possible.
+	both := withPrivateAddress("anchor.internal")
+	both.PublicDomain = "example.tld"
+	got, err := Resolve(shelf(proxy(), labelled("board", "git", 8080)),
+		[]string{"board"}, both, World{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	given := received(t, mustDeclare(t, got))
+	if given[0].Values["name"] != "git.example.tld" {
+		t.Fatalf("the public name did not compose alongside the internal one: %v", given[0].Values)
+	}
+	if given[0].Values["internal-name"] != "git.anchor.internal" {
+		t.Fatalf("the internal name did not compose alongside the public one: %v", given[0].Values)
+	}
+
+	publicOnly, err := Resolve(shelf(proxy(), labelled("board", "git", 8080)),
+		[]string{"board"}, withDomain("example.tld"), World{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	givenPublicOnly := received(t, mustDeclare(t, publicOnly))
+	if _, has := givenPublicOnly[0].Values["internal-name"]; has {
+		t.Fatalf("an internal name was composed with no private address to compose it from: %v",
+			givenPublicOnly[0].Values)
+	}
+}
+
+func TestTheApexLabelComposesToTheBarePrivateAddress(t *testing.T) {
+	got, err := Resolve(shelf(proxy(), labelled("board", "@", 4000)),
+		[]string{"board"}, withPrivateAddress("anchor.internal"), World{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	given := received(t, mustDeclare(t, got))
+	if given[0].Values["internal-name"] != "anchor.internal" {
+		t.Fatalf("the apex label did not compose to the bare private address: %v", given[0].Values)
+	}
+}
+
 func TestARoutedNameResolvesToTheServingNode(t *testing.T) {
 	// novox/hq ADR 0066 propagate: a granted route name is published into internal resolution,
 	// mapped to the node that serves it, alongside the `<node>.internal` names — so every