klog: kernel log ring + /dev/klog + klog shell command

- rsnix/src/klog.rs: RAM ring of the last 128 serial log lines (128
  chars each), fed by serial_println! so every boot/low-level message
  is captured for free.  Sequence numbers per line, wrap/drop
  accounting; the ring never allocates (const-constructible static).
- /dev/klog char device; shell 'klog' is a thin alias for cat
  /dev/klog with the same filters/redirection, so 'klog -t 5',
  'klog -g fat' and 'klog WRITING /disk/.../boot.log' all work.
  klog rejects positional args (usage) and input keywords.
- Shell user-facing output (banner, prompt, term_print/term_println,
  pipeline sink, halt/poweroff) now writes to serial directly instead
  of through serial_println!, keeping echo/cat output out of the boot
  log (a streaming cat /dev/mem would otherwise wrap the ring).
- serial_println! macro hooks klog::append_fmt via format_args! (no
  alloc at call sites); klog::dump formats the log for the device.

Verified in QEMU: 28 boot lines captured (seq 0..27), shell output
absent from the ring, klog WRITING persists a boot log (mtype-checked),
wrap verified with a temporary 140-line boot loop (128 kept / 40
dropped, seq 40..167, oldest-live correct; loop reverted); full
test-disk round trip still fsck-clean.

0 files changed, 0 insertions, 0 deletions