Migrate formatting/linting to Oxfmt & Oxlint

[threepointone]

Replace Prettier/Biome with Oxfmt and Oxlint across the repo. Added .oxfmtrc.json and .oxlintrc.json, removed .prettierrc and biome.json, and updated AGENTS.md to document the new formatter/linter and configurations. Updated inline lint pragmas in source/fixture files (e.g. biome-ignore -> oxlint-disable-next-line or jsx-a11y/media-has-caption) and adjusted package.json dev dependencies to use oxfmt/oxlint. Miscellaneous code/test script changes to align with the new tooling.

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Latest commit: 8005e52

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commit: 8005e52