Resolve device selector on detach and add YuvStimProducer state tests.

Detach finds the shared producer via lcameraDev_resolveDeviceSelectorCReq
then removes buffers by attach identity; unit tests cover quale guards.

Co-authored-by: Cursor <cursoragent@cursor.com>

stimBuffApis/lcameraBuff/lcameraBuffInternal.h

@@ -25,6 +25,7 @@ struct LcameraDevDllState
 	lcameraDev_mainFn *lcameraDev_main;
 	lcameraDev_exitFn *lcameraDev_exit;
 	lcameraDev_getOrCreateDeviceCReqFn *lcameraDev_getOrCreateDeviceCReq;
+	lcameraDev_resolveDeviceSelectorCReqFn *lcameraDev_resolveDeviceSelectorCReq;
 	lcameraDev_releaseDeviceCReqFn *lcameraDev_releaseDeviceCReq;
 	lcameraDev_configureSessionModeCReqFn *lcameraDev_configureSessionModeCReq;
 };