[quality] test: add 33 unit tests for pkg/k8s GPU health helpers

[clubanderson]

Test Improvement

Adds 33 unit tests for 5 pure helper functions in the GPU health subsystem (pkg/k8s) that previously had zero test coverage.

Tests added:

Function	Tests	What's verified
deriveGPUNodeStatus	7	healthy/degraded/unhealthy transitions, critical vs non-critical checks, ≥3 failures threshold, empty input
isStuckPod	6	ContainerStatusUnknown, terminating >5min, terminating <5min (not stuck), pending >10min, pending <10min (not stuck), healthy running
checkOperatorPod	6	Running pod passes, CrashLoopBackOff fails, Pending/ImagePullBackOff fails, pod on wrong node (not-found), nil pods, empty pods
unstructuredNestedMap/Slice	8	Valid paths, deep nesting, missing keys, wrong types, nil input
IsGPUResourceName / SumGPURequested	6	All known vendors, unknown resources, multi-vendor sum, nil/empty inputs

Why this matters:

• These functions drive the GPU health dashboard — bugs silently misclassify node health
• deriveGPUNodeStatus has non-obvious critical-check logic that was completely untested
• isStuckPod determines operator alerts for GPU nodes; wrong thresholds = missed issues
• unstructuredNestedMap/Slice parse CRD data — nil panics crash handlers

Fixes #19555

---

Filed by quality agent (ACMM L4/L6 — full mode)

[kubestellar-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign clubanderson for approval. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[netlify]

✅ Deploy Preview for kubestellarconsole ready!

Name	Link
🔨 Latest commit	1c39e98
🔍 Latest deploy log	https://app.netlify.com/projects/kubestellarconsole/deploys/6a3c884c422e810008dad7be
😎 Deploy Preview	https://deploy-preview-19556.console-deploy-preview.kubestellar.io
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[github-actions]

🐝 Hi @clubanderson! I'm kubestellar-hive[bot], an automation bot for this repo.

Trusted users — org members and contributors with write access — can mention @kubestellar-hive in a comment to trigger repo automation.
On issues, that mention queues an automated fix attempt. On pull requests, it records extra context for existing automation.
This is not an interactive Q&A bot, so mentions should be treated as requests for automation rather than a conversation.

Automation may take a moment to start, and follow-up happens through workflow activity rather than chat replies.

[github-actions]

👋 Hey @clubanderson — thanks for opening this PR!

🤖 This project is developed exclusively using AI coding assistants.

Please do not attempt to code anything for this project manually.
All contributions should be authored using an AI coding tool such as:

• Claude Code (Opus 4.5 / 4.6) — recommended
• GitHub Copilot
• Cursor
• Other AI coding assistants

This ensures consistency in code style, architecture patterns, test coverage,
and commit quality across the entire codebase.

---

This is an automated message.

[Copilot]

Pull request overview

Adds a focused unit-test suite for GPU health helper logic in pkg/k8s, improving confidence in node health classification and pod/operator status edge cases that feed the GPU dashboard.

Changes:

• Add unit tests for deriveGPUNodeStatus covering critical-check failures, non-critical thresholds, and empty input.
• Add unit tests for isStuckPod and checkOperatorPod covering common stuck/CrashLoopBackOff/Pending/not-found scenarios.
• Add unit tests for unstructuredNestedMap / unstructuredNestedSlice for valid paths, missing keys, wrong types, and nil input.