raposza/tools: platform/raposza-runtime/README.md

<!-- Copyright (c) 2026 bentzn --> <!-- SPDX-License-Identifier: Apache-2.0 --> # raposza-runtime Process supervision, embedded PostgreSQL, the free-port guard, health and lifecycle ordering. **Nothing here knows what Canton is.** A class that names a Canton version, an edition, a HOCON key or a par