Chaos Mesh client wrapper

[CodeBuildder]

Context

Thin wrapper around Chaos Mesh CRD API abstracting PodChaos, NetworkChaos, etc. Parent: #24.

Acceptance Criteria

• Client can create, read, and delete Chaos Mesh CRs via the k8s API
• Wrapper raises typed errors for missing CRDs or RBAC permission failures
• Unit tests mock the k8s API and verify correct CR payloads
• Integration test: create a PodChaos CR → verify it reaches Running phase

Dependencies

Blocked by: none | Blocks: none

Notes

No model tier. Existing work is the base.