klog/tty/pager: no more truncated lines — full lines flow, terminal wraps

- klog: MAX_LINE 128 -> 512 (lens widened u8 -> u16) — long serial_println
  lines (panics, boot messages) are no longer cut at 128 bytes; they
  print in full and the terminal wraps them at the screen edge
- tty: LINE_BUF_SIZE 256 -> 1024 — typed command lines longer than 256
  chars were silently dropped at the buffer limit; now they echo and
  submit in full (the terminal already wraps the echo mid-typing)
- pager (-p): screenfuls now count wrapped rows, not lines — a line
  wider than the terminal occupies ceil(len/cols) rows, so the pause
  lands at a real screen boundary instead of overflowing it

0 files changed, 0 insertions, 0 deletions