fix(lexer): handle backslash-escaped metacharacters#230
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Backslash outside quotes is a quoting mechanism in bash: \< means literal <. The lexer now strips the backslash and emits only the escaped character, enabling [ "a" \< "b" ] string comparisons. Removes 3 skip markers from spec tests (test_string_lt, test_string_gt, neg_string_compare_equal).
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Summary
\<and\>now correctly produce literal<and>tokens, enabling string comparison in[test commandsTest plan
test_string_lt,test_string_gt,neg_string_compare_equalnow passcargo test --all-features)cargo clippycleancargo fmtclean