mesh-knowledge: give the bus test's bundle a fixed clock, so it passes on any day (issue 540)

The bundle dated a reservation from the real day while the proposal kept the
fixture's 2026-10-11, so the date rule refused it on every later day.

modules/mesh-knowledge/cmd/mesh-knowledge/kit_test.go

@@ -28,10 +28,15 @@ import (
 
 const bundleVar = "MESH_KNOWLEDGE_TEST_BUNDLE"
 
+// bundleDay is the bundle's clock: the day the fixture's proposals are dated (valid's Date), so a reservation and the
+// proposal after it are of one day whatever day the test runs on (issue 540).
+var bundleDay = time.Date(2026, 10, 11, 9, 0, 0, 0, time.UTC)
+
 func TestMain(m *testing.M) {
 	if os.Getenv(bundleVar) == "1" {
 		// The bundle the bus test starts: the knowledge base as the runtime launches it, its store in memory.
 		k := newKB(newMemStore())
+		k.Now = func() time.Time { return bundleDay }
 		serve(k, os.Getenv("MESH_KNOWLEDGE_STATUS"))
 		os.Exit(0)
 	}