fix(hu-plugin-template): drop divergent plugin-event WIT variant, fix CI doc

Remove the extra plugin-event variant absent from the canonical wit/v0.1 contract, and reword the crate doc to describe the actual CI wasm plugin job instead of a nonexistent check-console step.

Author: YuanYuYuan

crates/hiroz-union/plugins/hu-plugin-template/src/lib.rs

@@ -1,6 +1,6 @@
 //! Minimal CLI plugin — mirrors the "Quick start" code in docs/tools/hu-plugins.md.
 //!
-//! This crate is compiled in CI (`check-console` step, `wasm32-wasip2` target)
+//! This crate is built in CI by the WASM plugin job (`wasm32-wasip2` target)
 //! to ensure the authoring guide stays valid as the WIT interface evolves.
 //! It is not shipped as part of the hiroz release.
 

crates/hiroz-union/plugins/hu-plugin-template/wit/hu-plugin.wit

@@ -63,16 +63,6 @@ interface types {
         interrupt,
     }
 
-    // v0.3 alias — kept so existing binaries that declare plugin-event in their
-    // manifest type still link against a v0.3 host. New plugins use tui-event.
-    variant plugin-event {
-        startup(list<string>),
-        key-action(string),
-        topic-selected(string),
-        tick,
-        interrupt,
-    }
-
     record plugin-manifest {
         name: string,
         version: string,