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Completes the 'loop, next, break, do' TODO entry — break and next
were landed in the previous commit; this adds the remaining two forms:
- loop { body } — infinite loop; the only exit is break. Simpler than
while/until since there is no condition expression to evaluate.
- do { body } while expr; / do { body } until expr; — post-condition
loop: body always executes at least once, condition is checked at the
bottom of each iteration. Condition tokens are collected until ';'
(mirrors _expression_get but stops at semicolon instead of '{'), then
replayed each iteration using the same temp-stack/temp-iterator
technique as while/until. Both break and next are supported.
Token changes: TT_LOOP and TT_DO added to the keyword enum in token.h,
registered in get_tt() and tt_get_name() in token.c.
Add examples/loop_do.fy; expected output: 5 / 12 / 11 / 5.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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