fix: template interpolation and Cache::fake() in tests

- interpolateVariables: use string concatenation for triple-brace
  placeholders instead of PHP string interpolation which only
  produces single braces
- AgentToolRegistryTest: replace Cache::fake() (not available) with
  Cache::flush() since array driver is already in-memory

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Jobs/ProcessContentTask.php

@@ -111,10 +111,12 @@ class ProcessContentTask implements ShouldQueue
     private function interpolateVariables(string $template, array $data): string
     {
         foreach ($data as $key => $value) {
+            $placeholder = '{{{' . $key . '}}}';
+
             if (is_string($value)) {
-                $template = str_replace("{{{$key}}}", $value, $template);
+                $template = str_replace($placeholder, $value, $template);
             } elseif (is_array($value)) {
-                $template = str_replace("{{{$key}}}", json_encode($value), $template);
+                $template = str_replace($placeholder, json_encode($value), $template);
             }
         }
 

tests/Unit/AgentToolRegistryTest.php

@@ -105,7 +105,7 @@ function makeApiKey(int $id, array $scopes = [], ?array $toolScopes = null): Api
 
 describe('forApiKey caching', function () {
     beforeEach(function () {
-        Cache::fake();
+        Cache::flush();
     });
 
     it('returns the correct tools on first call (cache miss)', function () {
@@ -213,7 +213,7 @@ describe('cache TTL', function () {
     });
 
     it('stores entries in cache after first call', function () {
-        Cache::fake();
+        Cache::flush();
 
         $registry = new AgentToolRegistry;
         $registry->register(makeTool('plan.create', []));
@@ -231,7 +231,7 @@ describe('cache TTL', function () {
 
 describe('flushCacheForApiKey', function () {
     beforeEach(function () {
-        Cache::fake();
+        Cache::flush();
     });
 
     it('removes the cached entry for the given key id', function () {