Blog/lfx-mentorship-spring-2026-unified-cli

[SargamPuram]

Related issue

This PR adds the graduation blog post for the Spring 2026 LFX Mentorship under the Unified CLI project:

• Ref [Feature] Unified CLI kyverno#15264 (Main LFX Mentorship Issue)
• Discussed and mentored by @realshuting and @fjogeleit.

Proposed Changes

This PR introduces a new blog post titled "I Made a Policy Engine Think It Was in Production" under src/content/blog/lfx-mentorship-spring-2026-unified-cli/.

The blog post details the 12-week journey of my LFX Mentorship:

1. Foundation Fixes: Resolving various CLI panics, silent test result swallowing, and resource lookup bugs for MutatingPolicy, GeneratingPolicy, and DeletingPolicy.
2. New Offline Capabilities: Implementing the in-memory fake dynamic client to enable offline testing of HTTP/Envoy authorization policies and cross-resource evaluation.
3. Offline Mocking (The Disguise): Creating resolveResourcesMockData to translate user mock resource declarations into unstructured []interface{} slices, allowing the CEL engine to process them seamlessly offline as if they were retrieved from a live Kubernetes informer cache.

The post also includes diagrams illustrating the timeline and architecture, as well as a custom cover thumbnail.

Checklist

• I have read the contributing guidelines.
• I have inspected the website preview for accuracy.
• I have signed off my issue.

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