fix: split repoRoot into apiRoot + standardsRoot

- Definitions load from MokoStandards-API (repoRoot = API repo)
- Template files load from MokoStandards (standardsRoot = sibling dir)
- Set MOKOSTANDARDS_ROOT env var to override template source location

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

lib/Enterprise/RepositorySynchronizer.php

@@ -167,7 +167,10 @@ class RepositorySynchronizer
         $this->logger->logInfo("Starting synchronization for {$org}/{$repo}");
 
         // Resolve repo root (two levels up from this file: Enterprise/ → lib/ → api/ → root)
-        $repoRoot = dirname(dirname(dirname(__DIR__)));
+        // API repo root (definitions, sync code)
+        $repoRoot = dirname(dirname(__DIR__));
+        // MokoStandards repo root (templates, configs)
+        $standardsRoot = getenv('MOKOSTANDARDS_ROOT') ?: dirname($repoRoot) . '/MokoStandards';
 
         // Detect platform from repo metadata
         $repoInfo = $this->adapter->getRepo($org, $repo);
@@ -212,7 +215,7 @@ class RepositorySynchronizer
         }
 
         // Create PR with file updates driven by the definition
-        $result   = $this->createSyncPR($org, $repo, $platform, $filesToSync, $repoRoot, $force);
+        $result   = $this->createSyncPR($org, $repo, $platform, $filesToSync, $standardsRoot, $force);
         $prNumber = $result['number'] ?? null;
         $summary  = $result['summary'] ?? [];
 
@@ -280,7 +283,7 @@ class RepositorySynchronizer
             $defaultBranch = $repoInfo['default_branch'] ?? 'main';
 
             // Resolve repo root relative to this file's location
-            $repoRoot    = dirname(dirname(dirname(__DIR__)));
+            $repoRoot    = dirname(dirname(__DIR__));
             $baseDefPath = "{$repoRoot}/definitions/default/{$platform}.tf";
             if (!file_exists($baseDefPath)) {
                 $baseDefPath = "{$repoRoot}/definitions/default/default-repository.tf";