chore: add PHPStan/Larastan to dev dependencies

Add larastan/larastan ^3.0 to require-dev and create phpstan.neon
config at level 5 covering all source directories. Adds a
`composer analyse` script shortcut.

Fixes #26

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

composer.json

@@ -12,6 +12,7 @@
         "lthn/php": "*"
     },
     "require-dev": {
+        "larastan/larastan": "^3.0",
         "laravel/pint": "^1.18",
         "orchestra/testbench": "^9.0|^10.0",
         "pestphp/pest": "^3.0"
@@ -35,6 +36,7 @@
         }
     },
     "scripts": {
+        "analyse": "phpstan analyse",
         "lint": "pint",
         "test": "pest"
     },

phpstan.neon

@@ -0,0 +1,33 @@
+includes:
+    - vendor/larastan/larastan/extension.neon
+
+parameters:
+    level: 5
+
+    paths:
+        - Boot.php
+        - Concerns
+        - Console
+        - Contracts
+        - Controllers
+        - Database
+        - Enums
+        - Events
+        - Exceptions
+        - Features
+        - Jobs
+        - Listeners
+        - Mail
+        - Middleware
+        - Models
+        - Notifications
+        - Routes
+        - Rules
+        - Scopes
+        - Services
+        - View
+
+    excludePaths:
+        - vendor
+
+    checkMissingIterableValueType: false