docs: Add Gemini consultation on PSR-4 controller casing

Confirmed Controllers/ (uppercase) is required for PSR-4 autoloading
on case-sensitive Linux filesystem. Repo already correct.

Signed-off-by: Claude (Chronicler #63) <claude@firefrostgaming.com>

docs/consultations/gemini-blueprint-casing-2026-04-06.md

@@ -0,0 +1,71 @@
+# Gemini Consultation: Blueprint Controller Casing
+
+**Date:** April 6, 2026  
+**Chronicler:** #63  
+**Topic:** PSR-4 autoloading and folder casing for Blueprint extensions
+
+---
+
+## Question Summary
+
+We found a discrepancy between:
+- Dev Panel backup: `controllers/` (lowercase)
+- Git repo: `Controllers/` (uppercase)
+
+Namespace in PHP: `Pterodactyl\BlueprintFramework\Extensions\modpackchecker\Controllers;`
+
+---
+
+## Gemini's Response
+
+### The Clear Answer
+
+The folder in your repository must be `Controllers/` (uppercase C).
+
+### The Reasoning
+
+PHP's modern autoloading relies strictly on the PSR-4 standard. Under PSR-4, the physical directory structure must perfectly mirror the namespace structure.
+
+Because your namespace explicitly declares an uppercase 'C':
+
+```php
+namespace Pterodactyl\BlueprintFramework\Extensions\modpackchecker\Controllers;
+```
+
+The autoloader will instruct the server to look for a directory named exactly `Controllers`.
+
+Crucially, your Pterodactyl panel runs on Linux. The Linux filesystem is strictly case-sensitive. If PHP asks Linux for `Controllers/ModpackAPIController.php` but the folder is named `controllers/` (lowercase), Linux will report that the path does not exist, and the application will crash.
+
+### The Gotchas
+
+1. **The "It Works on Windows" Trap:** If any initial development, testing, or file extraction happened on a Windows machine, the code might have actually executed fine. Windows is generally case-insensitive. But the moment that codebase is pushed to your Linux server, the exact same code will trigger a `500 Server Error: Class '...ModpackAPIController' not found`.
+
+2. **Git Casing Blindness:** Git sometimes ignores folder case changes if you just rename it in your file explorer. If you simply rename `controllers` to `Controllers` on a Windows machine, Git might not register the change, and the lowercase folder will still push to the server.
+
+### Git Fix (if needed)
+
+```bash
+git mv controllers temp_controllers
+git mv temp_controllers Controllers
+git commit -m "Fix PSR-4 autoloading: Capitalize Controllers folder"
+```
+
+---
+
+## Resolution
+
+Our repo (`firefrost-services`) already has `Controllers/` with correct uppercase casing. No changes needed.
+
+The Dev Panel backup had lowercase `controllers/` — this explains potential autoloading issues. When deploying from repo, we'll have correct casing.
+
+---
+
+## Action Items
+
+- [x] Confirmed repo has correct casing
+- [ ] Deploy from repo to Dev Panel (will fix casing automatically)
+- [ ] Document this in README troubleshooting section
+
+---
+
+*Consultation complete. Thank you, Gemini!* 💙🔥❄️