- Enhanced plugin metadata API with find_method() and get_methods()
- Implemented generic plugin method calling system (execute_plugin_method_generic)
- Fixed TLV encoding: use Bytes tag for string data in write()
- Fixed read() method: provide default size argument when called without args
- Replaced hardcoded execute_plugin_file_method with dynamic system
- Full end-to-end test successful: FileBox plugin write/read working
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Co-Authored-By: Claude <noreply@anthropic.com>