Add Zeitwerk eager loading check to CI

[trevorturk]

Summary

• Adds Zeitwerk::Loader.eager_load_all validation to CI pipeline
• Runs after linter, before test matrix for fast feedback
• Currently blocked by upstream ruby_llm ActiveRecord dependency issues

Problem

Without automated Zeitwerk eager loading validation, autoloading issues can slip into production causing crashes. These issues include:

• Inflector configuration errors
• Constant definition problems
• Missing conditional checks for optional dependencies

Solution

Add a simple validation step that runs Zeitwerk::Loader.eager_load_all after dependency installation. This structural validation completes in ~2 seconds and provides rapid feedback before expensive test suites run.

Upstream Dependencies

This PR is currently blocked and marked as draft because it depends on upstream fixes in ruby_llm:

• ruby_llm#504 - Fixes ActiveRecord dependency issues that cause NameError during eager loading
• ruby_llm#505 - Adds the same eager loading check to ruby_llm's CI

Once these PRs are merged and a new version of ruby_llm is released, this PR can be updated and marked ready for review.

Testing

Currently fails with:

uninitialized constant RubyLLM::ActiveRecord::ActsAs::ActiveSupport (NameError)

This is expected and will be resolved by ruby_llm#504.

🤖 Generated with Claude Code

[patvice]

Hey! Thanks for the PR -- I'm open to this if your downstream changes merged into RubyLLM

Only question is that Zeitwerk::Loader.eager_load_all is going to load all ruby files within a project. Right now it's failing in my CI due to ActiveSupport not be available when loading RubyLLM gem. That is not a hard dependency of RubyLLM or MCP gem, so I am wondering if there is not some work to do to exclude those files or had checks within.

Whatever RubyLLM provides as it solution for this, I'm happy to follow.

[patvice]

Looks like I commented to soon and #94 provides that solution.

Happy to merge this once RubyLLM does

[trevorturk]

Sounds good, thanks! Also note this is entirely optional and pedantic, so if it's annoying later on of course feel free to remove!