purejq 0.3.1

Robustness release — same jq semantics (777 conformance tests pass unchanged), no input can crash the parser.

An adversarial fuzz sweep (120k calls) found three inputs that escaped jq's error model; all now raise a clean JqParseError:

• malformed \u escapes ("\uZZZZ") raised ValueError
• Unicode-but-not-ASCII characters after . (e.g. .ä) raised AttributeError
• deeply nested programs ([[[[…, {a:{a:…) raised RecursionError and could overflow the C stack under a raised recursion limit

The parser now caps structural nesting at a fixed depth that trips under CPython's default recursion limit on every platform, with a backstop catch for long flat pipe/operator chains.