Add detailed tenancy references and guidelines to boost resources

resources/boost/skills/tenancy/references/impersonation.md

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+# User Impersonation Reference
+
+Use this when implementing tenant user impersonation.
+
+## Source Files
+
+- `src/Features/UserImpersonation.php`
+- `src/Database/Models/ImpersonationToken.php`
+- `assets/impersonation-migrations/*`
+
+## Setup
+
+```bash
+php artisan vendor:publish --provider="Stancl\Tenancy\TenancyServiceProvider" --tag=impersonation-migrations
+php artisan migrate
+```
+
+Enable feature:
+
+```php
+'features' => [
+    Stancl\Tenancy\Features\UserImpersonation::class,
+],
+```
+
+## Command
+
+```bash
+php artisan tenants:purge-impersonation-tokens
+```
+
+## Rules
+
+- Verify tenant match before logging in impersonated users.
+- Test guard, redirect URL, remember flag, token TTL, and invalid token behavior.
+- Purge expired tokens routinely.