Signed-off-by: erick-alcachofa <erick@artichoke.dev>
Updates the README to reflect the completion of the front-end parser
infrastructure and shifts the roadmap toward semantic analysis.
Simultaneously synchronizes the formal EBNF grammar with recent
syntactic changes.
- Formalize 'Global Turbofish' (::<>) for all type instantiations.
- Implement '.field = value' syntax for named field initializers.
- Add 'type_initiated_literal' to support anonymous type construction.
- Support optional boundaries in slice syntax ([:], [n:], etc.).
- Update README with a technical checklist and usage instructions for
the artichoke-c frontend.
- Fix various EBNF syntax errors and missing angle brackets.