Deprecate a3u-gcs blueprint as its no longer maintained

[bytetwin]

Readme after changes

[gemini-code-assist]

Summary of Changes

Hello @bytetwin, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request formally deprecates the a3u-gcs blueprint by updating its README.md file. The change informs users that the blueprint is no longer maintained and will be removed by a specific date, while also guiding them towards a recommended alternative blueprint for their needs. This ensures users are aware of the blueprint's status and can transition to supported solutions.

Highlights

• Blueprint Deprecation: The a3u-gcs blueprint has been officially deprecated due to lack of maintenance and will be removed by December 15, 2025.
• Alternative Recommendation: Users are now recommended to use the A3 Ultra Slurm Blueprint as an alternative to the deprecated a3u-gcs blueprint.
• README Update: The README.md for the a3u-gcs blueprint has been updated to prominently display its deprecated status and provide guidance on the recommended alternative.

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[gemini-code-assist]

Code Review

This pull request deprecates the a3u-gcs blueprint by adding a prominent warning message to its README.md file. The change is clear and achieves its goal. I have provided a couple of minor suggestions to improve the readability of the deprecation notice and to adhere to common file formatting conventions.

[gemini-code-assist]

The ![deprecated-badge] already indicates that the blueprint is deprecated. The following text "This blueprint is deprecated" is redundant. Consider rephrasing to improve conciseness and readability.

Suggested change

	> ![deprecated-badge] This blueprint is deprecated and is no longer maintained. The blueprint will be removed by Dec 15, 2025
	> ![deprecated-badge] This blueprint is no longer maintained and will be removed by Dec 15, 2025