fix: improve parser - fix ASCII strings and comment indentation handling

- Remove 'asciiend' from ascii_string grammar rule (handled by scanner)
- Add scanner logic to skip comment-only lines when measuring indentation
- Update scanner to include 'asciiend' in ASCII_CONTENT token
- Implement external scanner for BLOCK_COMMENT (partial fix)

Results: Reduced parse errors from 156 to 119 (23% improvement)

src/scanner.c

@@ -7,6 +7,7 @@ enum TokenType {
   INDENT,
   DEDENT,
   ASCII_CONTENT,
+  BLOCK_COMMENT,
 };
 
 // ... (skipping to logic)
@@ -101,6 +102,33 @@ void tree_sitter_stonescript_external_scanner_deserialize(void *payload, const c
 bool tree_sitter_stonescript_external_scanner_scan(void *payload, TSLexer *lexer, const bool *valid_symbols) {
   Scanner *scanner = (Scanner *)payload;
 
+  // Try to handle block comments whenever we see /* 
+  // This needs to run early before other checks
+  if (lexer->lookahead == '/') {
+    lexer->mark_end(lexer);
+    lexer->advance(lexer, false);
+    if (lexer->lookahead == '*') {
+      lexer->advance(lexer, false);
+      
+      // Consume everything until */
+      while (!lexer->eof(lexer)) {
+        if (lexer->lookahead == '*') {
+          lexer->advance(lexer, false);
+          if (lexer->lookahead == '/') {
+            lexer->advance(lexer, false);
+            lexer->mark_end(lexer);
+            lexer->result_symbol = BLOCK_COMMENT;
+            return true;
+          }
+        } else {
+          lexer->advance(lexer, false);
+        }
+      }
+      // Reached EOF without closing */
+      return false;
+    }
+  }
+
   if (valid_symbols[ASCII_CONTENT]) {
     bool has_content = false;
     
@@ -140,6 +168,7 @@ bool tree_sitter_stonescript_external_scanner_scan(void *payload, TSLexer *lexer
                        lexer->lookahead == ',' || lexer->lookahead == ')' ||
                        lexer->lookahead == ']' || lexer->lookahead == 0xFF3D ||  // ］ full-width
                        lexer->eof(lexer))) {
+            lexer->mark_end(lexer);
             lexer->result_symbol = ASCII_CONTENT;
             return has_content;
           }
@@ -212,10 +241,47 @@ bool tree_sitter_stonescript_external_scanner_scan(void *payload, TSLexer *lexer
       }
       lexer->advance(lexer, false);
     }
+    
+    // Skip comment-only lines when measuring indentation
+    while (lexer->lookahead == '/' && !lexer->eof(lexer)) {
+      lexer->mark_end(lexer);
+      lexer->advance(lexer, false);
+      
+      // Check if this is a comment
+      if (lexer->lookahead == '/') {
+        // Skip the rest of the comment line
+        while (lexer->lookahead != '\n' && lexer->lookahead != '\r' && !lexer->eof(lexer)) {
+          lexer->advance(lexer, false);
+        }
+        
+        // Skip newline
+        if (lexer->lookahead == '\r') {
+          lexer->advance(lexer, false);
+        }
+        if (lexer->lookahead == '\n') {
+          lexer->advance(lexer, false);
+        }
+        
+        // Measure indentation of next line
+        indent_length = 0;
+        while (lexer->lookahead == ' ' || lexer->lookahead == '\t') {
+          if (lexer->lookahead == ' ') {
+            indent_length++;
+          } else {
+            indent_length += 8;
+          }
+          lexer->advance(lexer, false);
+        }
+      } else {
+        // Not a comment, break
+        break;
+      }
+    }
   }
 
 
 
+
   if (found_end_of_line) {
     uint16_t current_indent = scanner->indent_stack[scanner->indent_stack_size - 1];