Merge feat/starlight-docs branch to main

[kmcginnes]

Merge the feat/starlight-docs feature branch into main. This branch serves as the intermediate integration branch collecting all Starlight documentation PRs. Once all sibling tasks are complete and the branch is stable, open a single PR from feat/starlight-docs → main to land everything at once.

Related Issues

• Part of Migrate documentation to Starlight (Astro) #1754

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