Jose Luis Montañes Ojados 65220f88c6 Add if statements, unary minus, and fix GC safe points ...

- Lexer: recognize 'if' as keyword (TOK_IF)
- Parser: add NODE_IF with if_statement union, parse if/cond/body,
  handle unary minus in parse_term as 0 - expr
- Eval: add NODE_IF evaluation, move GC to NODE_BLOCK level to avoid
  destroying temporary values during sub-expression evaluation

2026-02-16 05:12:28 +01:00

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