Add learning plugin for educational code understanding

[ibihim]

Summary

Add new learning plugin with two commands for helping engineers understand code and concepts through structured educational approaches.

Commands

/learning:explain <file|package|concept>

Provides deep, first-principles explanations using WHAT/WHY/HOW structure:

• WHAT: High-level overview and mental models
• WHY: Problem being solved and design decisions
• HOW: Implementation details and mechanisms

Works with:

• Code files (e.g., pkg/reconciler/controller.go)
• Packages (e.g., pkg/cache)
• Technical concepts (e.g., eventual consistency)

/learning:build-from-scratch <topic or technology>

Creates Liz Rice-style "Build Your Own X" walkthroughs:

• Starts with simplest working example
• Builds incrementally (one concept per step)
• Provides runnable code at every step
• Shows how complexity emerges from simple fundamentals
• Connects to real-world production systems

Output in .work/learning-build-from-scratch/{topic}/

Changes

• Added plugins/learning/ directory with plugin structure
• Created plugin.json metadata
• Created two command definitions following man page format
• Created comprehensive README with usage examples
• Registered plugin in marketplace.json
• Auto-generated documentation (PLUGINS.md, docs/data.json)

Testing

• ✓ Validated with make lint (all checks passed)
• ✓ Plugin follows all repository conventions
• ✓ Command definitions follow man page format
• ✓ Proper frontmatter and required sections

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

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

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• OWNERS

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[openshift-ci]

Hi @ibihim. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[theobarberbany]

/ok-to-test

[stbenjam]

I think we are not wanting to get AI's to generate any content as if they were a specific human. Especially without permission, but this is probably a general rule we should establish in the repo regardless. Instead, I'd suggest frame it as what qualities you like about how she presents the material. It's also better for the AI to understand