​docs(sdk): update AGENTS.md for OptimizerClient

[khushiwayal]

Hi everyone! I'm a first-year student and this is my first contribution to the Kubeflow repo.

I saw Issue #189 and wanted to help out. I've updated the AGENTS.md file under the Context Awareness section to include the rules for the new OptimizerClient. I added the required import paths, the backend execution options, and the rules for defining the Search Space so AI agents will generate the correct hyperparameter tuning code.

Fixes #189

Please let me know if I need to adjust any of the formatting!

[google-oss-prow]

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[github-actions]

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[Copilot]

Pull request overview

Updates AGENTS.md to better guide AI agents/contributors when generating Kubeflow Optimizer hyperparameter tuning code, aligning agent guidance with the Optimizer SDK surface.

Changes:

• Adds a new “OptimizerClient (Hyperparameter Tuning)” section under Context Awareness.
• Documents recommended imports and how to define search spaces using Search.

[Copilot]

The execution guidance is inaccurate: OptimizerClient currently only supports KubernetesBackend via KubernetesBackendConfig (no ContainerBackend/LocalProcessBackend backends exist under kubeflow/optimizer/backends).

Suggested change

	- **Execution:** It supports both local execution (`ContainerBackend`, `LocalProcessBackend`) and remote Kubernetes cluster execution (`KubernetesBackend`).
	- **Execution:** It currently supports only remote Kubernetes cluster execution via `KubernetesBackend` configured through `KubernetesBackendConfig` (local backends such as `ContainerBackend` and `LocalProcessBackend` are not available).

[Copilot]

Typo: "conventionso" should be "conventions".

Suggested change

	- Preserve existing logging and error-handling conventionso
	- Preserve existing logging and error-handling conventions