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Add managed_pathways_service for Pathways-on-Cloud

This change introduces Managed Pathways Service for GKE. It includes:
tpu_manager.py uses kubectl to deploy a Pathways proxy JobSet on a GKE cluster, sets up port forwarding, and configures JAX environment variables to connect to the proxy.

run_connect_example.py is an example script to start the proxy. Prerequisite: A Pathways cluster is up and running with Resource Manager and worker pods deployed successfully, e.g., using pw-cluster.yaml.

TESTED: on proxy 2 clients each requesting 2 x v5e-32 simultaneously.

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@copybara-service copybara-service bot force-pushed the test_801034430 branch 6 times, most recently from af9ca4c to c1a1ddf Compare August 29, 2025 23:05
This change introduces Managed Pathways Service for GKE. It includes:
`tpu_manager.py` uses `kubectl` to deploy a Pathways proxy JobSet on a GKE cluster, sets up port forwarding, and configures JAX environment variables to connect to the proxy.

`run_connect_example.py` is an example script to start the proxy. Prerequisite: A Pathways cluster is up and running with Resource Manager and worker pods deployed successfully, e.g., using pw-cluster.yaml.

TESTED: on proxy 2 clients each requesting `2 x v5e-32` simultaneously.
PiperOrigin-RevId: 801034430
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