fix: only suppress module-not-found errors in plugin loader

Previously both loadOrchestrator() and loadPluginServices() caught all
errors, masking real failures like syntax errors or missing transitive
dependencies. Now only MODULE_NOT_FOUND / ERR_MODULE_NOT_FOUND errors
are suppressed; all other exceptions are rethrown.

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

dist/index.js

@@ -2259,8 +2259,10 @@ async function loadOrchestrator() {
             },
         };
     }
-    catch {
-        // Orchestrator package not installed
+    catch (error) {
+        if (!isModuleNotFoundError(error)) {
+            throw error;
+        }
     }
 }
 exports.loadOrchestrator = loadOrchestrator;
@@ -2300,10 +2302,22 @@ async function loadPluginServices() {
         };
     }
     catch (error) {
+        if (!isModuleNotFoundError(error)) {
+            throw error;
+        }
         core.warning(`Orchestrator plugin not available: ${error.message}`);
     }
 }
 exports.loadPluginServices = loadPluginServices;
+function isModuleNotFoundError(error) {
+    if (error && typeof error === 'object' && 'code' in error) {
+        const code = error.code;
+        if (code === 'MODULE_NOT_FOUND' || code === 'ERR_MODULE_NOT_FOUND') {
+            return true;
+        }
+    }
+    return typeof error?.message === 'string' && /cannot find module/i.test(error.message);
+}
 
 
 /***/ }),