feat: add a dedicated tainted node pool for sandbox workers#13
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Adds a `sandbox` Karpenter NodePool to karpenter-resources, the node substrate for the Managed Agents self-hosted sandbox workers. The pool carries an `agents.stxkxs.io/sandbox` taint and label, so sandbox worker pods land on dedicated nodes — agent tool execution is kept off the shared `default` pool. Consolidation is `WhenEmpty` (not `WhenEmptyOrUnderutilized`): a node is reclaimed once it drains its last session, never disrupted while a session is still running. It reuses the `default` EC2NodeClass and is sized for bursty, ephemeral work (`c`/`m` instances, fast 30s empty-node consolidation). The default NodePool and the per-environment overlays are unchanged — the overlays patch the `default` pool by name, so `sandbox` passes through untouched.
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Summary
sandboxKarpenter NodePool tokarpenter-resources— the node substrate for the Managed Agents self-hosted sandbox workers.agents.stxkxs.io/sandboxtaint + label, so sandbox worker pods land on dedicated nodes, kept off the shareddefaultpool.WhenEmpty— a node is reclaimed once it drains its last session, never disrupted mid-session. Reuses thedefaultEC2NodeClass; sized for bursty ephemeral work.Test plan
task validate— yamllint clean;kustomize buildsucceeds for the karpenter-resources dev / staging / production overlays