Routes may share one lease (affinity = "route") and skip crossbar's queue (queue = false)

route.go gains Route.Affinity/Queue with PerRoute(), Queues() and affinity
validation (checkRoutes moved here; config.go calls it once). limiter.Track
counts a request without holding or refusing it; a release hands the slot to a
waiter only while in flight <= parallel. The proxy leases a PerRoute() route
under an empty fingerprint (the row keeps the real one) and uses Track when
Queues() is false.

Implemented by Ornith (OpenCode); owner review removed a release-on-first-flush
workaround for a race in the owner's given test (see implementer log).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/config/config_v23_test.go

@@ -0,0 +1,75 @@
+package config_test
+
+// v2.3 task 02: the affinity and queue route keys.
+
+import (
+	"strings"
+	"testing"
+
+	"git.wntrmute.dev/kyle/crossbar/internal/config"
+)
+
+const affinityBase = `
+listen = "127.0.0.1:1"
+[hosts.a]
+base_url = "http://a:1"
+models = { "m" = { } }
+[routes.plain]
+hosts = ["a"]
+[routes.convo]
+hosts = ["a"]
+affinity = "conversation"
+[routes.boxmaker]
+hosts = ["a"]
+affinity = "route"
+queue = false
+[routes."bm-*"]
+hosts = ["a"]
+affinity = "route"
+queue = false
+[routes.queued]
+hosts = ["a"]
+queue = true
+`
+
+func TestAffinityAndQueueKeys(t *testing.T) {
+	c, err := config.Parse(strings.NewReader(affinityBase))
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, tc := range []struct {
+		route            string
+		perRoute, queues bool
+	}{
+		{"plain", false, true}, // defaults: conversation affinity, queueing on
+		{"convo", false, true},
+		{"boxmaker", true, false},
+		{"bm-agent-1", true, false}, // a template's keys reach its concrete routes
+		{"queued", false, true},
+	} {
+		r, _, ok := c.Route(tc.route)
+		if !ok {
+			t.Fatalf("route %q not found", tc.route)
+		}
+		if r.PerRoute() != tc.perRoute || r.Queues() != tc.queues {
+			t.Errorf("%s: PerRoute %v Queues %v, want %v %v", tc.route, r.PerRoute(), r.Queues(), tc.perRoute, tc.queues)
+		}
+	}
+}
+
+func TestAffinityRejectsUnknownValues(t *testing.T) {
+	for _, bad := range []string{`"session"`, `"Route"`, `1`} {
+		text := strings.Replace(affinityBase, `affinity = "conversation"`, "affinity = "+bad, 1)
+		_, err := config.Parse(strings.NewReader(text))
+		if err == nil || !strings.Contains(err.Error(), "routes.convo.affinity") {
+			t.Errorf("affinity = %s: err %v, want one naming routes.convo.affinity", bad, err)
+		}
+	}
+}
+
+func TestQueueMustBeABool(t *testing.T) {
+	text := strings.Replace(affinityBase, "queue = true", `queue = "no"`, 1)
+	if _, err := config.Parse(strings.NewReader(text)); err == nil {
+		t.Error(`queue = "no" parsed; want an error`)
+	}
+}