fix(justfile): remove Rust cross build-riscv recipe from Ada project

Author: hyperpolymath

Justfile

@@ -96,9 +96,3 @@ crg-badge:
       D) color="orange" ;; E) color="red" ;; F) color="critical" ;; \
       *) color="lightgrey" ;; esac; \
     echo "[![CRG $$grade](https://img.shields.io/badge/CRG-$$grade-$$color?style=flat-square)](https://github.com/hyperpolymath/standards/tree/main/component-readiness-grades)"
-
-
-# [AUTO-GENERATED] Multi-arch / RISC-V target
-build-riscv:
-	@echo "Building for RISC-V..."
-	cross build --target riscv64gc-unknown-linux-gnu