agent-platform release v4.55.0

The klaus-gateway ServiceMonitor carries the tenant label: klausGateway.serviceMonitor (giantswarm/giantswarm#36711, giantswarm/klaus-gateway#316). The chart’s monitor was on and carried the chart’s own labels only, so Mimir routed its scrape to no tenant and every klaus_gateway_* series was lost on every installation (seen on gazelle, chart 1.19.1). klausGateway.serviceMonitor.labels sets observability.giantswarm.io/tenant: giantswarm and klausGateway.serviceMonitor.enabled is auto, resolved to the boolean the chart takes from the same answer as every other monitor of this chart. Pin first: components.klaus-gateway.versionRange is >=1.20.0 <2.0.0 and examples/customer-bom.yaml pins 1.20.0, the release that opens the labels key; an older chart’s schema refuses it. verify-klausgateway-otlp asserts the resolution and the label; verify-components-charts names 1.20.0 as UNRELEASED until it exists.