feat: Introduce mock ROM mode for testing without actual ROM files

- Added a new feature to the `z3ed` AI agent allowing testing in mock ROM mode, which creates a minimal valid ROM structure with embedded labels but no actual game data.
- Updated the `agent_test_suite.sh` script to default to mock ROM mode for easier testing.
- Introduced `--mock-rom` command line flag to enable mock ROM mode in various agent commands.
- Enhanced documentation to cover the usage and benefits of mock ROM mode for CI/CD and development testing.
- Implemented necessary changes in the codebase to support mock ROM initialization and label management.

src/cli/agent.cmake

@@ -97,6 +97,7 @@ set(YAZE_AGENT_SOURCES
   cli/service/resources/resource_context_builder.cc
   cli/handlers/overworld_inspect.cc
   cli/handlers/message.cc
+  cli/handlers/mock_rom.cc
   cli/flags.cc
   cli/service/rom/rom_sandbox_manager.cc
 )