HelpTocModel Class

Detailed Description

The tree has two layers:

• Filesystem nodes — folders and .md files. Their HelpLocation has a non-empty path.
• Heading nodes (H2 / H3) — children of their owning page, HelpLocation inherits the page's path and adds an anchor.

Determinism: order matches the input toc.json exactly. Selecting any index yields a HelpLocation via locationFor().