chore: remove unused .claude-plugin directory

[johnnygreco]

Summary

• Remove the skills/data-designer/.claude-plugin/plugin.json file, the last remaining Claude Code marketplace plugin artifact in the repo

[greptile-apps]

Greptile Summary

This PR removes skills/data-designer/.claude-plugin/plugin.json, the last remaining artifact from a Claude Code marketplace plugin integration. The change is purely cosmetic/housekeeping and has no impact on runtime behavior.

• Deletes the unused plugin.json metadata file (name, version, description, author, keywords, etc.)
• No other files in the repository reference .claude-plugin or plugin.json, so the removal is complete and leaves no dangling references

Confidence Score: 5/5

• Safe to merge — single-file deletion of an unused metadata artifact with no downstream dependencies.
• The PR deletes exactly one JSON metadata file that is not imported, required, or referenced anywhere else in the codebase. There is zero risk of breakage.
• No files require special attention.

Important Files Changed

Filename	Overview
skills/data-designer/.claude-plugin/plugin.json	Deleted leftover Claude Code marketplace plugin metadata file; no references to this file or directory remain elsewhere in the repository.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["skills/data-designer/"] --> B[".claude-plugin/ ❌ removed"]
    A --> C["Other existing contents"]
    B --> D["plugin.json ❌ deleted"]

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