Add fileref_source node for %include FILEREF(member) syntax; bump to 0.4.1

Extends include_statement to accept fileref_source (FILEREF or FILEREF(member.sas))
alongside the existing string_literal form. Defined as a lexed terminal to prevent
_option_token catch-all from consuming the member parens. Fixes 82% %include miss
rate on AHRQ corpus (79 statements, all in fileref form, previously zero resolved).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: BrandonGarate177

Cargo.toml

@@ -556,11 +556,21 @@ export default grammar({
 
     include_statement: $ => seq(
       $._pct_include,
-      field("source", $.string_literal),
+      field("source", choice(
+        $.string_literal,
+        $.fileref_source,
+      )),
       repeat($._option_token),
       ";",
     ),
 
+    // Fileref syntax: %include FILEREF; or %include FILEREF(member.sas);
+    // Defined as a single lexed terminal so the lexer matches FILEREF(member)
+    // atomically — longer match beats the plain identifier, preventing
+    // _option_token's catch-all regex from swallowing the parens first.
+    // Captured as @import.source in queries; member name is inside the parens.
+    fileref_source: $ => /[A-Za-z_][A-Za-z0-9_]*(\([A-Za-z_][A-Za-z0-9_.]+\))?/,
+
     // ── LIBNAME ───────────────────────────────────────────────────────────
 
     // Everything after libref kept flat — Ix query finds string_literal by position.

grammar.js

@@ -21,10 +21,14 @@
   (proc_step_header
     name: (identifier) @name)) @definition.module
 
-; %INCLUDE → import
+; %INCLUDE → import (string literal form)
 (include_statement
   source: (string_literal) @import.source) @import
 
+; %INCLUDE → import (fileref form: FILEREF or FILEREF(member.sas))
+(include_statement
+  source: (fileref_source) @import.source) @import
+
 ; LIBNAME → import (library path)
 (libname_statement
   (string_literal) @import.source) @import