ci: add RHCOS version confirmation from job artifacts

[petr-muller]

Document how to confirm actual RHCOS version by inspecting .status.nodeInfo.osImage from nodes.json in gather-extra artifacts. Add Step 3b to test-failure and install-failure analysis skills with real examples from CI jobs.

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Summary by CodeRabbit

Release Notes

• Documentation

  • Added guidance for confirming the RHCOS variant and version used by a cluster through available job artifacts.
  • Enhanced prow job analysis workflows with new steps for identifying RHCOS versions and detecting heterogeneous clusters.

• Chores

  • CI plugin version updated: 0.0.49 → 0.0.50

[coderabbitai]

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between c6d52ea and 6ea65c2.

📒 Files selected for processing (6)

• .claude-plugin/marketplace.json
• docs/index.html
• plugins/ci/.claude-plugin/plugin.json
• plugins/ci/references/jobs.md
• plugins/ci/skills/prow-job-analyze-install-failure/SKILL.md
• plugins/ci/skills/prow-job-analyze-test-failure/SKILL.md

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Walkthrough

The ci plugin gains a new "Step 3b: Confirm RHCOS Version" in both the install-failure and test-failure analysis skills, along with a matching reference section in jobs.md. The step fetches nodes.json from gather-extra, parses osImage fields to classify RHCOS 9 vs 10, and detects heterogeneous clusters. The plugin version is bumped from 0.0.49 to 0.0.50 across three manifest files.

Changes

CI Plugin RHCOS Confirmation and Version Bump

Layer / File(s)	Summary
RHCOS version confirmation guidance plugins/ci/references/jobs.md, plugins/ci/skills/prow-job-analyze-install-failure/SKILL.md, plugins/ci/skills/prow-job-analyze-test-failure/SKILL.md	Adds a "Confirming RHCOS version from artifacts" reference section and Step 3b to both analysis skills: fetch nodes.json from gather-extra, parse .status.nodeInfo.osImage to determine RHCOS 9 vs 10, flag heterogeneous clusters with mixed values, and skip non-blocking if the file is absent.
Plugin version bump to 0.0.50 plugins/ci/.claude-plugin/plugin.json, .claude-plugin/marketplace.json, docs/index.html	Bumps the ci plugin version field from 0.0.49 to 0.0.50 in the plugin manifest, marketplace registry, and the embedded docs index.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• openshift-eng/ai-helpers#416: Modifies prow-job-analyze-install-failure skill documentation, directly overlapping with the install-failure skill extended in this PR.
• openshift-eng/ai-helpers#341: Adds analysis steps to prow-job-analyze-test-failure/SKILL.md, the same file extended with Step 3b in this PR.
• openshift-eng/ai-helpers#283: Touches plugins/ci/.claude-plugin/plugin.json and .claude-plugin/marketplace.json for the ci plugin version metadata, the same files bumped here.

Suggested labels

approved, lgtm

Suggested reviewers

• brandisher
• stbenjam

🚥 Pre-merge checks | ✅ 10

✅ Passed checks (10 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically summarizes the main change: adding documentation on confirming RHCOS version from job artifacts, which is the core objective of this pull request.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
No Real People Names In Style References	✅ Passed	The PR includes "Plow" and "Coughlan" only as codenames within example osImage strings (e.g., "Red Hat Enterprise Linux CoreOS 9.8...-(Plow)"), showing actual system output. These are not used as s...
No Assumed Git Remote Names	✅ Passed	PR contains no hardcoded git remote names like "origin" or "upstream" in commands, skills, or documentation. New documentation uses prow-job-artifact-search without assuming specific git remote n...
Git Push Safety Rules	✅ Passed	PR contains only static documentation and configuration files (JSON, Markdown, HTML) with no git push commands, force pushes, or pushes to main/master branches.
No Untrusted Mcp Servers	✅ Passed	The PR contains only documentation updates and version bumps. No MCP server installations from untrusted sources, npm packages, or suspicious configurations were introduced.
Ai-Helpers Overlap Detection	✅ Passed	No overlapping ai-helpers functionality detected. PR adds NEW Step 3b to existing skills for RHCOS version confirmation from artifacts; no duplicate commands/skills exist.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

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[cblecker]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cblecker, petr-muller

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