feat(rt2): term.size + term.width — the wmux ladder's last runtime asks
- term.size(fd) -> ?TermSize{cols,rows}: TIOCGWINSZ, resize's read twin;
nil = not a tty (expected answer, never a trap)
- term.width(cp): libc wcwidth under C.UTF-8 (LC_CTYPE set on first
use, host-locale fallback): -1 control, 0 combining, 1, 2
- ids 108/109 (all four registrations); TermSize predeclared
- legs: PTY sized 77x33 from outside answers exactly that, pipe answers
nil, widths a/CJK/combining/BEL = 1/2/0/-1; test_term 81/0, woc 557/0
- story runtime-v2 6 recorded done; board row appended
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
(cherry picked from commit 1514fb46c21c4318856cfcb3ca2b4d430caba72b)
shoney.arickathil
5e8e0960bc