Implement recording functionality in agent test commands

- Added RecordingState structure to manage recording session details.
- Implemented SaveRecordingState and LoadRecordingState functions to handle recording state persistence.
- Enhanced HandleTestRecordCommand to support starting and stopping recording sessions with various options.
- Integrated gRPC calls for starting and stopping recordings in GuiAutomationClient.
- Updated ProposalRegistry to include sandbox directory and ROM path in ProposalMetadata.
- Implemented JSON parsing for Tile16Proposal to handle proposal creation from JSON input.
- Updated CMakeLists.txt to ensure proper linking of emulator targets.

src/cli/service/gui/gui_automation_client.h

@@ -134,6 +134,21 @@ struct ReplayTestResult {
   std::vector<std::string> logs;
 };
 
+struct StartRecordingResult {
+  bool success = false;
+  std::string message;
+  std::string recording_id;
+  std::optional<absl::Time> started_at;
+};
+
+struct StopRecordingResult {
+  bool success = false;
+  std::string message;
+  std::string output_path;
+  int step_count = 0;
+  std::chrono::milliseconds duration{0};
+};
+
 enum class WidgetTypeFilter {
   kUnspecified,
   kAll,
@@ -303,6 +318,15 @@ class GuiAutomationClient {
     const std::string& script_path, bool ci_mode,
     const std::map<std::string, std::string>& parameter_overrides = {});
 
+  absl::StatusOr<StartRecordingResult> StartRecording(
+      const std::string& output_path,
+      const std::string& session_name,
+      const std::string& description);
+
+  absl::StatusOr<StopRecordingResult> StopRecording(
+      const std::string& recording_id,
+      bool discard = false);
+
   /**
    * @brief Check if client is connected
    */