lcameraDev: add resolve-only deviceSelector API and deduplicate resolve paths.

Export lcameraDev_resolveDeviceSelectorCReq for attach-identity consumers,
factor live-camera snapshot helpers, and share resolveDeviceSelectorAgainstRecords
with get-or-create session acquisition.

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

commonLibs/lcameraDev/tests/selectorResolve_tests.cpp

@@ -45,6 +45,22 @@ TEST(FormatCameraListForDiagnosticsTest, ListsIndexedCameras)
 	EXPECT_NE(text.find("location=front"), std::string::npos);
 }
 
+TEST(ResolveDeviceSelectorAgainstRecordsTest, BakedUsbHdmiCameraMatchesExampleSelector)
+{
+	const std::vector<CameraIdentityRecord> records =
+		tests::bakedProfilesAsRecords(dellLaptopMachineTag);
+
+	const CameraIdentityRecord resolved =
+		resolveDeviceSelectorAgainstRecords(
+			"model-substr:HDMI;location:EXTERNAL",
+			records);
+
+	EXPECT_EQ(
+		resolved.id,
+		"\\_SB_.PCI0.XHC_.RHUB.HS01-1:1.0-32e4:9415");
+	EXPECT_EQ(resolved.locationLabel, "external");
+}
+
 TEST(ResolveSelectorAgainstRecordsTest, BakedUsbHdmiCameraMatchesExampleSelector)
 {
 	const std::vector<CameraIdentityRecord> records =