🤖 feat: implement Helm parity phases 1-2 for CoderControlPlane #405

Job	Run time
Detect changed paths	30s
Codex Comments	33s
test	55s
lint	1m 14s
Terraform (fmt/validate/tflint/trivy)	0s
Lint GitHub Actions	0s
E2E (Kind + CNPG + Templates)	23s
Publish GHCR :main	-1s
	3m 34s

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