fix(velox): trace the dead touchpad to its own connector, and repair two lost todo headings

The touchpad fault was an interrupt line that never fired: the device
enumerated, hid-multitouch bound, and the handler sat correctly on amd_gpio
pin 8, but the count stayed at zero across all 24 CPUs under active use and
the i2c-HID reset timed out at every boot. A live USB reproduced it exactly,
which ruled out software. The fix was the touchpad's own connector — the
input-cover ribbon I reseated first fixed the phantom power button and left
this untouched, and the 4-pin connector beside the silkscreen is GND and VCC
only, so it could never have carried i2c. Both faults from the mainboard swap
are now closed.

Two task headings had been overwritten by inserts at the top of Open Work, and
I recovered both verbatim from the commits that introduced them. One displaced
task had ridden an archived parent into Resolved, so an open bug had been
sitting outside Open Work for weeks.

Filed the install placeholder passwords still live on this laptop as an [#A],
graded on severity alone rather than the frequency matrix: full-disk encryption
protected by a dictionary word does no work at all on a machine that travels.

Corrected the ARCHSETUP_DIR line in the reinstall runbook. It carried a tilde on
the right-hand side of an assignment, which zsh does not expand, so following it
would have produced an ISO with the installer silently absent.

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