feat(qvl): add GQL parser (ISO 39075) - Sprint 2 WIP
Add Graph Query Language parser components:
- gql/ast.zig: AST types (Query, Match, Create, Return, etc.)
- gql/lexer.zig: Tokenizer with ISO 39075 keywords
- gql/parser.zig: Recursive descent parser
- gql.zig: Module entry point with parse() function
Supports:
- MATCH, CREATE, DELETE, RETURN statements
- Node and Edge patterns with properties
- Variable length paths (*1..3 quantifiers)
- WHERE clauses with AND/OR logic
- Property comparisons (=, <>, <, <=, >, >=)
Note: Tests need Zig API updates (ArrayList changes)
Part of Sprint 2: GQL Parser.
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