[FEATURE] Built-in tool to wait for Kubernetes resource conditions #56

[Main discussion and idea from alexis-brettes (Nayero): https://discord.com/channels/1346225185166065826/1346225185841221644/1497163015047352361]

Add a built-in tool that blocks until a k8s resource reaches a given condition, using k wait under the hood. This removes the need for agents to poll repeatedly and saves a significant number of tokens.

When an agent deploys something and needs to wait for it to be ready, it currently has to call k get in a loop until the resource reaches the desired state. Each loop iteration is a full LLM turn, which wastes tokens and adds latency.

Current pattern:

[turn 1] kgp -n default  ->  Pending
[turn 2] kgp -n default  ->  Pending
[turn 3] kgp -n default  ->  Running

Proposed Solution

A tool that wraps k wait and returns only when the condition is met or the timeout expires:

k wait deployment/myapp -n default --for=condition=Available --timeout=300s

The tool would accept: resource type, resource name, namespace, condition, and timeout. It makes one blocking call and returns a clear success or failure message. No polling loop, no extra LLM turns.

This is related to kagent-dev/kagent#1541 but targets a specific and common use case: waiting for k8s resources rather than waiting for a fixed amount of time.