docs(helm): align teardown release and namespace with install (NVBug 6622509)

[kheiss-uwzoo]

Summary

• Fix the Helm README full-teardown path so it uses the same REL / NS values as the recommended install (retriever / default), instead of the chart name nemo-retriever and a retriever namespace that the quickstart never creates.
• Stop hiding helm uninstall failure with 2>/dev/null || true. Confirm the target release first, then verify it is gone before deleting leftover NIM resources.
• Scope NIMCache / NIMService / PVC cleanup to the named CRs this chart creates. Keep namespace-wide kubectl delete ... --all only as an explicit warning, not the advertised command.

NVBugs: https://nvbugspro.nvidia.com/bug/6622509

This is a docs-only change to nemo_retriever/helm/README.md. No chart templates, values, or runtime behavior.

Why

Literal execution of the old teardown block uninstalled a release that did not exist, suppressed the Helm error, and left the actual retriever release (and GPU / NIMCache / PVC workloads) running. nemo-retriever is the chart name, not the Helm release name.

Test plan

• Recommended install and full teardown share REL=retriever and NS=default.
• helm uninstall is not wrapped in 2>/dev/null || true.
• NIM CR delete uses the four core chart names plus optional names in prose, not --all.
• Install with the documented recommended command, run the new teardown steps, and confirm the Helm release, service Deployment, named NIM CRs, and intended PVCs are gone (cluster verification; not run in this PR).
• If you installed into a non-default namespace, confirm the procedure tells you to replace NS and to run helm list --all-namespaces when the target is empty.

PR scope check (nrl-pr-scope / focused-git-pr)

Check	Result
Base	main
Commits	1 — docs(helm): align teardown release and namespace with install (NVBug 6622509)
Files	1 — nemo_retriever/helm/README.md
Red flags	None for this task (Helm README is the intended file; no templates, values.yaml, or workflows)

Overlap: draft #2595 also edits this README (copy-paste ellipsis). This PR rewrites the keep-on-uninstall example and drops the leftover ... in that block.

pre-draft: leakage, mkdocs --strict, ::a, ::p, ::r on the diff vs main

Base: upstream/main
Files: nemo_retriever/helm/README.md

Check	Result
Leakage (page roles + see [ CTAs)	PASS — helm README is an allowed path; no see [ CTAs in the file. The leakage script vs stale origin/main also scanned leftover untracked custom-metadata.md (not in this diff).
Allowed paths	PASS — 1 documentation file
mkdocs --strict	N/A for this file (not in MkDocs nav). Strict build failed on untracked leftover pages custom-metadata.md / user-defined-stages.md that are not in this diff.
::a audit	PASS — chart name nemo-retriever (Chart.yaml); example release retriever; keepOnUninstall default true; core CR names match templates (95%)
::p polish	Applied — numbered teardown steps; shared REL / NS on install and teardown
::r style	95% — new prose has no contractions, uses refer to / do not, and introduces command blocks with complete sentences. Unchanged README contractions and em dashes were left in place.

Code drift (not in this docs PR): nemo_retriever/helm/templates/nims/*.yaml do not set app.kubernetes.io/instance, so label-scoped NIM CR deletion is not available without an eng change. Teardown deletes by the chart's fixed CR names instead.

PR: this draft

[greptile-apps]

Greptile Summary

The documentation now aligns the recommended Helm installation and teardown release identity and replaces namespace-wide cleanup with explicit, inspectable resource deletion.

• Defines consistent REL=retriever and NS=default values for installation and teardown.
• Verifies the Helm target before cleanup and no longer suppresses uninstall failures.
• Covers all default core and optional NIM resources, supported name overrides, and corresponding PVCs.
• Warns against namespace-wide deletion when unrelated resources may be present.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
nemo_retriever/helm/README.md	The revised Helm commands resolve the previously reported teardown omissions and add safer target verification and resource-scoping guidance.

_{Reviews (3): Last reviewed commit: "docs(helm): include optional NIM names i..." | Re-trigger Greptile}