v2.0.6

Parentheses grouping and comprehensive edge case tests for QueryParser

• Parenthesized expressions: (A AND B) OR C via recursive parsing
• All comparison operators handle nil values gracefully (push false)
• Whitespace handling: tabs, newlines, carriage returns everywhere
• String escaping: mixed quotes, Unicode characters
• Numeric edge cases: Int min/max, negative values
• Property access: deep nesting, array bounds
• Spatial edge cases: zero/negative tolerance, degenerate bboxes
• Boolean logic: triple not, long chains (1000 conditions)
• Keywords as property values (and, or, not, exists, in)
• Case-insensitive keywords (AND, AND, OR)
• OSM-like multi-condition spatial queries
• Missing property comparisons safely return false