cloud: add cloud release notes for release-20260908

[doc-claw-bot]

What is changed, added, or deleted? (Required)

Add the September 8, 2026 TiDB Cloud release note entry for the new TiDB Cloud Premium changefeed API endpoints.

Which TiDB version(s) do your changes apply to? (Required)

• v8.5

What is the related PR or file link(s)?

None

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

Summary by CodeRabbit

• Documentation
  • Added September 8, 2026 release notes for TiDB Cloud Essential.
  • Documented that instances with the June 30 enhancements display CLOUD.202603.x on the console’s instance overview page.
  • Documented new TiDB Cloud Premium v1beta2 changefeed API endpoints for creating, viewing, pausing, resuming, scaling, and deleting CDC changefeeds targeting Kafka, MySQL, Amazon S3, and Alibaba Cloud OSS.

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📝 Walkthrough

Walkthrough

The release notes add a September 8, 2026 entry for the TiDB Cloud Essential console version display and TiDB Cloud Premium changefeed API v1beta2 endpoints.

Changes

TiDB Cloud release notes

Layer / File(s)	Summary
Document Essential version display tidb-cloud/releases/tidb-cloud-release-notes.md	Documents that TiDB Cloud Essential instances with the June 30 enhancements display CLOUD.202603.x on the console instance overview page.
Document Premium changefeed APIs tidb-cloud/releases/tidb-cloud-release-notes.md	Documents v1beta2 APIs for creating, listing, getting, deleting, pausing, resuming, and scaling TiDB Cloud Premium changefeeds.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to e5229

This updates TiDB Cloud release notes for the Essential console version display and Premium changefeed APIs. No current merge-readiness risk remains.

Suggested reviewers: qiancai

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the TiDB Cloud release notes update and the September 8, 2026 release.
Description check	✅ Passed	The description states the main change, identifies the applicable TiDB version, and includes the related-links and change-type sections. It omits the AI agent involvement section and the first-time co…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[LGTM Timeline notifier]

Timeline:

• 2026-09-09 04:08:41.101472007 +0000 UTC m=+1857156.272566111: ☑️ agreed by lilin90.