Enable shell completion for configured command aliases

internal/hook/aliases.go

@@ -49,7 +49,14 @@ func WriteAliasFiles(entries []AliasEntry) error {
 		return err
 	}
 	writeFishAliasFile(entries) // best-effort — never blocks the caller on failure
-	return nil
+	alias := ""
+	for _, entry := range entries {
+		if entry.Host == "" {
+			alias = entry.Name
+			break
+		}
+	}
+	return SyncCommandCompletion(alias)
 }
 
 func writeShAliasFile(entries []AliasEntry) error {