feat: create GitHub PR flywheel siphon for learning

[atxtechbro]

This PR creates a GitHub PR flywheel siphon that extracts learning material from any GitHub repository.

Key Features

• Monitors any GitHub repository for PR activity
• Creates detailed GitHub issues with complete PR data (diff, comments, metadata)
• Includes a learning module template in each issue
• Configurable through a simple text file

Core Assumptions

1. GitHub Platform: Uses GitHub's PR system
2. PR Quality: PRs contain meaningful descriptions for learning context
3. Public Access: Repository is accessible with standard permissions

How It Works

The system creates a flywheel effect:

• PR activity in any repository → Learning material in this repo
• Learning material → Improved understanding
• Improved understanding → Better PRs
• Better PRs → Better learning material

This follows Unix philosophy principles: do one thing well, write programs to work together, and store data in flat text files.

[atxtechbro]

Important clarification about this system's flexibility:

While initially conceived for monitoring a dotfiles repository, this implementation is actually repository-agnostic and can be used with any GitHub repository you want to learn from.

What the system actually assumes:

1. The target is a GitHub repository using pull requests
2. PRs contain meaningful descriptions (for learning context)
3. The repository is public or accessible with the provided token

What it does NOT assume:

• The repository doesn't need to contain dotfiles specifically
• The content type doesn't matter - could be any codebase you want to learn from
• No assumptions about specific file structures or naming conventions

This makes the system much more powerful as a learning tool. You could point it at:

• Open source projects with interesting patterns
• Your own repositories of various types
• Any GitHub repo with well-documented PRs that you want to learn from

The name 'dotfiles' in the workflow is just an artifact of the initial use case, but the implementation itself is a general-purpose PR data collector for learning from any GitHub repository.