ci: add HOL skill-publish validate workflow

[internet-dot]

This repo already has enough skill metadata to validate in CI.

A couple of repo-specific details I checked first:

• Connect external CLIs like Gemini CLI, Codex CLI, and Claude Code directly into your workflow
• Automatically works around MCP's 25K limit for large prompts and responses
• Multi-Model Code Review Workflow

This adds one workflow for . and leaves the runtime code alone.
It only runs the schema and trust checks for the skill metadata in validate mode.

If you would rather place the workflow under a different filename or point it at a different skill directory, I can adjust the branch.

[gemini-code-assist]

Note

Gemini is unable to generate a review for this pull request due to the file types involved not being currently supported.

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 45755bdb9d

ℹ️ About Codex in GitHub

Codex has been enabled to automatically review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

When you sign up for Codex through ChatGPT, Codex can also answer questions or update the PR, like "@codex address that feedback".

[chatgpt-codex-connector]

Point skill-dir to an actual skill package

The workflow validates skill-dir: ., but this repository does not contain the required SKILL.md and skill.json files at the root (or elsewhere); I checked the tree with rg --files | rg 'SKILL\.md|skill\.json' and found none. hashgraph-online/skill-publish documents skill-dir as required and expects those files, so this step will fail for every push/PR and can block CI until the path is changed to a real skill package directory (or the workflow is scoped to repos/paths that have one).

Useful? React with 👍 / 👎.