Refactor NemoClaw Documentation

Refactor a bounded documentation section without changing product meaning. Improve findability while preserving every useful fact, one canonical owner per topic, and every supported published route.

Prerequisites

• Work from the NemoClaw repository root.
• Follow the shared Documentation Writing and Review contract before planning or editing.
• Read the full target pages, their navigation entries in docs/index.yml, their redirects in fern/docs.yml, and their inbound links before editing.

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