docs(claude.md): document LLM-facing files and RTD layout

Add two sections to CLAUDE.md so future contributors (and AI coding
agents) know where llms.txt comes from and how html_baseurl per branch
should be set:

- LLM-Facing Files: how llms.txt is rendered from the Jinja template at
  build time, where the hook lives, and the rule for adding new
  top-level sections.
- Read the Docs Layout: canonical version slugs (rolling/1.5/1.4/...)
  vs URL-level redirect aliases (latest/lts/stable/codename), with the
  rule that html_baseurl points at the canonical not the alias.

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