Remove .pre suffix use .epoch and .fuel instead

crates/plugin_runtime/README.md

@@ -154,6 +154,8 @@ Plugins in the `plugins` directory are automatically recompiled and serialized t
 
 - `plugin.wasm.pre` is the plugin compiled to Wasm *and additionally* precompiled to host-platform-agnostic cranelift-specific IR. This should be about 700KB for debug builds and 500KB in release builds. Each plugin takes about 1 or 2 seconds to compile to native code using cranelift, so precompiling plugins drastically reduces the startup time required to begin to run a plugin.
 
+> TODO: Rework precompiled plugins.
+
 For all intents and purposes, it is *highly recommended* that you use precompiled plugins where possible, as they are much more lightweight and take much less time to instantiate.
 
 ### Instantiating a plugin

crates/plugin_runtime/build.rs

@@ -88,7 +88,7 @@ fn precompile(path: &Path, engine: &Engine, engine_name: &str) {
         .precompile_module(&bytes)
         .expect("Could not precompile module");
     let out_path = path.parent().unwrap().join(&format!(
-        "{}.{}.pre",
+        "{}.{}",
         path.file_name().unwrap().to_string_lossy(),
         engine_name,
     ));