open-cypher 0.3.0

Changed

• parse_recovering now preserves valid top-level clauses around malformed
  regions, inserting spanned ClauseKind::Error placeholders. Consumers must
  handle error clauses inside recovered queries instead of checking only for
  StatementKind::Error. Strict parsing and the public function signatures
  are unchanged.
• Recovery preserves the complete token stream and reports at most 32
  diagnostics. It respects unclosed delimiters and terminal RETURN clauses;
  retry-budget exhaustion leaves an error suffix. Ambiguous UNION inputs,
  multi-statement inputs, and inputs without recoverable clauses still fall
  back to a whole-input error statement. Expression-level repair is not included.

Internal

• Added clause-recovery regression tests, including retry-budget boundaries,
  and refreshed the verified-equivalent mutation ledger.
• Added clause-salvage and retry-budget benchmarks, plus recovery fuzz seeds
  and assertions for clause span validity, containment, and ordering.