Initialize Target Platform

Overview

This skill authors a new target-platform profile YAML — the write-side of the contract in ../../context/target-platform-contract.md. It uses ../../references/bsp-platforms-catalogue.md as the canonical product / flash-config catalogue and ../../references/platform_template.yaml as the field schema.

Flow is linear: pick a reference product + flash config, then optionally add custom-carrier details. The two contract cases — reference-only vs reference + custom carrier — are distinguished only by whether the user provides custom-carrier details; there is no up-front mode prompt.