docs(agents): document stale Helm subchart cleanup #2165

Job	Run time
Resolve PR metadata	9s
build-cli / Resolve build plan	3s
gpu-e2e	-1s
e2e	-1s
build-gateway	-1s
kubernetes-e2e	-1s
build-supervisor	-1s
Core E2E result	-1s
kubernetes-ha-e2e	-1s
Kubernetes HA E2E result	-1s
GPU E2E result	-1s
build-cli / Rust cli (amd64) / cli (amd64)	12m 38s
build-cli / Build ${{ inputs.component }} (${{ matrix.arch }})	0s
build-cli / Merge ${{ inputs.component }} manifest	0s
	12m 41s

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