Fix Blade compilation error in guidelines by escaping Antlers syntax

[darinlarimore]

Summary

• The core.blade.php guideline file contains Antlers template examples using {{ }} syntax, which Blade's compiler interprets as PHP echo statements
• Running boost:install --guidelines (or boost:install without flags) throws a ParseError: syntax error, unexpected identifier "limit", expecting ")" because Blade tries to compile {{ collection:blog limit="5" }} as PHP
• Fixed by prefixing all {{ }} occurrences with @ so Blade outputs them as literal text

Error reproduced

Illuminate\View\ViewException

syntax error, unexpected identifier "limit", expecting ")"
(View: .../vendor/chrisvasey/statamic-boost/resources/boost/guidelines/core.blade.php)

➜  30▕ <?php echo e(collection:blog limit="5"); ?>

Test plan

• Run php artisan boost:install --guidelines and confirm it completes without error
• Verify the generated guidelines output contains the correct Antlers syntax examples (without @ prefix in the final output)

🤖 Generated with Claude Code

[junioradwise]

I tested this and this solves the issue i raised in: #22

[podrabinek]

I need this fix too.