feat: plugin code, updates

languages/shellspec/brackets.scm

@@ -0,0 +1,25 @@
+; Quote pairs
+("'" @open "'" @close)
+("\"" @open "\"" @close)
+
+; Command substitution
+("$(" @open ")" @close)
+("${" @open "}" @close)
+
+; Parentheses
+("(" @open ")" @close)
+
+; Square brackets
+("[" @open "]" @close)
+
+; Curly braces
+("{" @open "}" @close)
+
+; ShellSpec block structure (if using End keyword)
+(simple_command
+  (command_name) @_cmd
+  (#match? @_cmd "^(Describe|Context|It|Specify|Example)$")) @open
+
+(simple_command
+  (command_name) @_end
+  (#eq? @_end "End")) @close