[will-lamerton]

Atlas Cloud has ended its sponsorship. Atlas Cloud stays a supported provider. This PR only removes the sponsor material.

• Removes the Atlas Cloud sponsor block from README.md, README.zh-CN.md and README.zh-TW.md. The Sponsors heading and the "become a sponsor" link stay.
• Removes the coding-plan promo from the provider docs page and rewrites its intro in the plain style the other provider pages use.

The provider template, model-ID handling, VS Code option and docs page are all unchanged. Docs only, so no changeset.

🤖 Generated with Claude Code

[github-actions]

No changeset found

This PR does not add a changeset, so it will not appear in the changelog or trigger a release.

If the change is user-facing, add one:

pnpm changeset

Pick a bump (patch / minor / major) and write the changelog entry in our usual voice ("Added X... Thanks to @you. Closes #123."), then commit the generated .changeset/*.md file.

If this PR is docs-only or a chore that needs no release note, you can ignore this — or run pnpm changeset --empty to record that intentionally.

[github-actions]

nc-review: nothing to raise

@will-lamerton — nothing to raise from the automated review.

The PR removes the Atlas Cloud sponsor block (logo, blurb, coding-plan promo) from all three README files and rewrites the provider docs intro in the same plain OpenAI-compatible-router style used by openrouter.md, orcarouter.md and requesty.md. The provider itself is untouched (still listed in docs/configuration/providers/index.md, the VS Code dropdown, the model-id normalizer, and the test suite), the Sponsors heading and 'Become one' link are deliberately kept, and no sponsor reference is left orphaned — the only remaining 'sponsor' mention is the CHANGELOG history entry, which is correct to leave alone. Docs-only change, no changeset needed; the change is warranted by the sponsorship ending and is correctly scoped.

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