Guidance: the way in

An agent needs a way into the Library (board #2497): by topic when it knows the area, and one entry point when it knows nothing.

• The root: one entry tagged index:root, the CLAUDE.md / llms.txt of the Library. virta guide shows it with every topic's index, so any topic is one hop away. It's also the MCP resource virta://guidance and registry/llms.txt in the export, and virta brief points to it.
• Topic indexes: an entry tagged index:topic and topic:<name> is that topic's start page. virta guide <topic> shows it, then the topic's entries.
• Scope: an entry applies scope:global, scope:topic (within its topics; the default for an entry with topics), or scope:<project> (one project). For a project, the narrower scope comes first: project, then topic, then global — a project's CLAUDE.md beats the practices, which beat model priors, made mechanical.
• Overrides are visible: a narrower entry that conflicts with a default says so, overrides:#n, and the default is listed as overridden by it for that project, never silently contradicted.

virta guide                      # the root, and every topic's index
virta guide coding               # one topic, in precedence order for this repo
virta guide coding --project tosijs-ui