Write down how to drive the board's three memory words

`Peek`, `Poke` and `Hexdump` are the reason this port exists and nothing here said
how to reach them. Two things are not guessable.

The boot layout: the editor now comes up as ONE EMPTY OUTPUT BUFFER and no shell
pane, because a shell is not a layout preference on bare metal but an
impossibility - nothing to fork, no pty. That is a pardes-side change; what belongs
here is that it is what `zig build interact -Dpardes` puts on the screen.

The chord: there is no mouse on a serial line, so execution is
`i <cmd> ESC` then `x` then TAB - write the command into the buffer, select the
line, execute the selection (pardes.zig:7669). `o` opens a fresh line for the
next one. Nothing about that is discoverable from the screen, and every other
spelling I tried failed in a way that looked like the port was broken: `:` opens
the tag command line in NORMAL mode, so typing there moves the cursor instead of
inserting, and the tag's editable region is seeded with the builtin words, so text
typed at its start merges into `Save` and the chord executes the wrong word.

Every number in the new section is off the die, including the one that matters:
`Peek 0x50110001` answers `peek: MisalignedAddress` on the message row instead of
trapping, and a trap here is a watchdog reset that takes the session with it.

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