raposza/tools: platform/raposza-target-3x/README.md

<!-- Copyright (c) 2026 bentzn --> <!-- SPDX-License-Identifier: Apache-2.0 --> # raposza-target-3x Translation implementation for Canton 3.4 and 3.5, over Ledger API v2. `Target3x` is discoverable through `ServiceLoader`, and its `connect()` returns `Lapi2Client`, the Ledger API v2 client. What a 3