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wm: FOCUSED is now a plain window id — window 0 (home terminal) is an
ordinary focusable window in the z-order. The CONSOLE sentinel
(usize::MAX) and the focused()==0 special cases are gone; focus_console()
is an alias for focus(0). Desktop clicks focus window 0. The WM input
pump routes every key unconditionally: IRQ ring -> pump -> focused
window's owner; nothing polls the scancode rings directly any more.
tty: read_line() reads from the calling task's message queue (the old
global-ring read_line and the duplicate read_line_from_queue are merged);
raw mode (read_byte/try_read_byte) consumes the same queue;
interrupt_pressed drains the queue instead of the ring.
shell: task 0 owns home terminal window 0 and blocks on its queue like a
windowed shell; cat/hexdump stdin paths pass the home terminal handle.
sched: watchdog comments updated (shell parks on recv_blocking).
Verified in QEMU: F1 spawns terminals, F2 cycles focus home->term1->
term2, keystrokes land only in the focused window, ^C cancels a line,
edit runs raw over the queue and exits to a working prompt; test-disk
regression PASS.
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