feat: Implement message handling commands for agent tool

- Added functionality for listing, reading, and searching messages in the ROM.
- Introduced new commands: `message-list`, `message-read`, and `message-search` with appropriate parameters and descriptions.
- Enhanced the CLI to support these commands, including JSON and text output formats.
- Updated system prompts and function schemas to reflect the new message handling capabilities.

src/cli/agent.cmake

@@ -80,6 +80,7 @@ set(YAZE_AGENT_SOURCES
   cli/service/resources/resource_catalog.cc
   cli/service/resources/resource_context_builder.cc
   cli/handlers/overworld_inspect.cc
+  cli/handlers/message.cc
   cli/flags.cc
   cli/service/rom/rom_sandbox_manager.cc
 )