Fix SKIP_WIDGET_RENDERER to work at gem load time

[rileyseaburg]

Summary

• Moves the SKIP_WIDGET_RENDERER check to the beginning of widget_renderer.rb so it runs during Bundler.require
• When SKIP_WIDGET_RENDERER=true, provides a stub class with the same interface instead of crashing
• This fixes the production crash where instances fail to start because the native library isn't found

Root Cause

The previous fix added the env var to manifests, but the check was in an initializer that runs after Bundler.require in config/application.rb. The gem was crashing during the bundle require phase before the initializer could run.

[Copilot]

Pull request overview

This PR moves the SKIP_WIDGET_RENDERER environment variable check to the beginning of widget_renderer.rb to fix a production crash where the native library loading fails before the initializer can run. When the env var is set to 'true', a stub class is provided instead of attempting to load the native library.

Key Changes

• Early environment variable check before requiring dependencies
• Stub class implementation when renderer should be skipped
• Addition of available? method to both stub and native implementations

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[Copilot]

The stub implementation defines render_widget(template, data) but the actual usage in the codebase calls WidgetRenderer.generate_js(json). The stub should define generate_js to match the actual interface of the native implementation.

Suggested change

	end
	end
	def self.generate_js(json)
	# Return nil to signal caller should use JS/ERB fallback
	nil
	end