Method peek_char

src/lib/parse/Tokenizer.cpp:113–116

// ── Internal scanning ─────────────────────────────────────────────────────────

char Tokenizer::peek_char() const {
    if (pos_ >= source_.size()) return '\0';
    return source_[pos_];
}

char Tokenizer::consume_char() {
    char c = source_[pos_++];