Add 0.4 changelog entry for manifest navigation ordering

[KayleeWilliams]

Follow-up to #120, which merged without a docs/changelog/0-4.mdx entry.

Adds an "Agent-readability artifacts" section documenting the navigation-order sorting of manifest.pages (and sitemap.xml), the llms-full.txt legacy-groups-mode parity, and the deliberately unchanged BYOP generateAgentArtifacts input order.

No changeset: the package changeset (.changeset/manifest-pages-nav-order.md) already landed with #120; this PR is release-notes prose only.

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• docs/changelog/0-4.mdx

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