Operator: Helm chart, Tilt integration, and showcase agent validation

[fmallmann]

Parent Issue

Part of #27

Description

Package the operator for deployment, integrate into local dev environment, and validate with a real showcase agent.

Scope

Helm chart

• CRD installed via Helm chart (following agent-runtime-operator pattern)
• Operator Deployment with RBAC (ServiceAccount, ClusterRole, ClusterRoleBinding)
• Configurable values: image, namespace, resource limits, testworkflow template names
• Webhook configuration for CRD validation (if implemented in Operator: Reconciler implementation, status reporting, and tests #29)

Docker image

• Dockerfile for the operator binary (multi-stage build)
• make docker-build and make docker-push targets

Tilt integration

• Add operator to Tiltfile for local development (build image, deploy chart, live reload)
• Operator starts automatically alongside existing infrastructure (testkube, agents, LGTM)

Update deploy/local/ examples

• Replace manual ConfigMap, TestWorkflow, and TestTrigger with Experiment CR
• Keep existing examples as reference or remove if fully superseded

Showcase agent validation

• Create an Experiment CR targeting showcase-cross-selling agent
• Deploy via Tilt and verify full pipeline executes end-to-end:
  • Operator reconciles CR into ConfigMap + TestWorkflow + TestTrigger
  • TestWorkflow runs all phases (run → evaluate → publish → visualize)
  • Metrics published to OTLP endpoint and visible in Grafana
• Document any issues or adjustments needed for real-world agent compatibility

Acceptance Criteria

• Helm chart installs CRD + operator with correct RBAC
• tilt up deploys operator alongside existing infrastructure
• deploy/local/ updated to use Experiment CR
• Experiment CR for showcase-cross-selling agent reconciles successfully
• Full pipeline executes and metrics appear in Grafana
• Docker image builds via Makefile

References

• Issue Testbench Operator: Reconcile Experiment CRD to TestWorkflows #27 Helm chart and deployment sections
• agent-runtime-operator for Helm chart structure
• showcase-cross-selling for validation target
• Existing chart/ directory for template patterns