Initialize BSP Customization Workspace

Overview

This skill bootstraps the source-side workspace that customize-* / build skills depend on: the Linux_for_Tegra overlay tracker (git repo for pristine + customization commits), the bsp_sources/ mono-tree (kernel, OOT, nvgpu, display, hwpm, hardware DTs), and a working NVIDIA Crosstool-NG cross-compile prefix. It owns only the source: block in the active profile and the on-disk source workspace under <source.root_path> (default: <workspace>/Source).

Responsibilities:

1. Optionally record a non-default source.root_path.
2. Create or mount the Linux_for_Tegra overlay tracker.
3. Materialize bsp_sources using the precedence in the "Materialize the BSP-sources baseline" step.
4. Resolve and record source.toolchain.
5. Clone extra user-defined repos from source.repos:.