Add pr-scout spec-audit workflow

[asmacdo]

I created a GH action to check for SPEC, and make sure PR is aligned with it. Using here.

https://github.com/asmacdo/pr-scout

Failed at first, so I added ignore to the pr-scout config. Since nothing changes, pr-scout just passes.

[github-actions]

pr-scout: spec-audit

⚠️ Code changed but spec was not updated

Code change summary

The following new functionality has been introduced:

• Automated PR Scout Analysis: A new GitHub Actions workflow named "pr-scout" will now automatically run on every pull request.
• AI-Powered Specification Audit: This workflow uses the pr-scout action to perform a "spec-audit" on the pull request. This audit is powered by OpenAI, utilizing an OpenAI API key and model passed via secrets.
• Pull Request Interaction: The pr-scout action has write permissions for pull requests, allowing it to potentially add comments or status updates directly to pull requests based on its audit findings.

[asmacdo]

@yarikoptic I'm going to merge so I can use this on my worktree PR, we can revert tomorrow if its not helpful.