tests: add parser/vm bitops tests; docs: update cheatsheet and language guide for bitwise ops and shift; note Arrow(>>) removal

- Add src/tests/parser_bitops_test.rs and vm_bitops_test.rs
- Update tokenizer unit test to expect SHIFT_RIGHT
- Update quick-reference and language guide to document &,|,^,<<,>> and Arrow deprecation

Known: one unrelated test failing (consolebox println TLV vs typebox) pre-existing.

src/tokenizer.rs

@@ -677,7 +677,7 @@ mod tests {
         let mut tokenizer = NyashTokenizer::new(">> == != <= >= < >");
         let tokens = tokenizer.tokenize().unwrap();
         
-        assert_eq!(tokens[0].token_type, TokenType::ARROW);
+        assert_eq!(tokens[0].token_type, TokenType::SHIFT_RIGHT);
         assert_eq!(tokens[1].token_type, TokenType::EQUALS);
         assert_eq!(tokens[2].token_type, TokenType::NotEquals);
         assert_eq!(tokens[3].token_type, TokenType::LessEquals);