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/tests/hilSmoCallbacksStub.h

@@ -0,0 +1,20 @@
+#ifndef LCAMERA_BUFF_TESTS_HIL_SMO_CALLBACKS_STUB_H
+#define LCAMERA_BUFF_TESTS_HIL_SMO_CALLBACKS_STUB_H
+
+#include <user/compute.h>
+#include <user/smoHooks.h>
+#include <memory>
+#include <vector>
+
+namespace lcamera_buff_tests {
+
+const smo::stim_buff::SmoCallbacks& hilSmoCallbacksStub();
+
+std::shared_ptr<smo::compute::ClBuffer> createUseHostPtrBufferStub(
+	void* hostPtr,
+	size_t size,
+	cl_mem_flags flags);
+
+} // namespace lcamera_buff_tests
+
+#endif // LCAMERA_BUFF_TESTS_HIL_SMO_CALLBACKS_STUB_H