Integrate WASM Runtime

Description

Integrate a WebAssembly runtime (e.g., Wasmer or Wasmtime) into the Spacedrive core. This will be the foundation for running sandboxed plugin code.

Implementation Steps

1. Research and select the most suitable WASM runtime for the project's needs (performance, security, ease of use).
   • Selected: Wasmer 4.2
2. Add the selected runtime as a dependency to the project.
   • Added to core/Cargo.toml with wasmer-middlewares
3. Create a PluginManager service that can load and execute a simple WASM module.
   • Implemented in core/src/infra/extension/manager.rs
4. Develop a basic "hello world" plugin to test the integration.
   • Test extension exists at extensions/test-extension/
   • Compiles to test_extension.wasm (254KB)

Remaining Work

• Complete WASM memory interaction helpers (read_string_from_wasm, write_json_to_wasm)
• Integrate with guest allocator for memory management
• Add hot-reload support for development

Acceptance Criteria

• A WASM runtime is successfully integrated into the Spacedrive core.
• The PluginManager can load and run a WASM module from a file.
• The "hello world" plugin executes successfully and returns the expected output.

Implementation Files

• core/src/infra/extension/manager.rs - PluginManager
• core/src/infra/extension/README.md - Architecture and status
• extensions/test-extension/ - Working test extension