docs(node): the ack comment described scalars that are gone

The handshake ack's app-directories entry still said "the same three answers in
one shape" and "the scalars above are derived from these and kept for MNP 1.0
clients". Neither is true since the per-app ops were folded into one: there are
no scalars above, and a 1.0 client cannot reach this code at all — the floor
moved to 3.0 with the lease flag day.

A comment that contradicts the code beside it is worse than no comment, because
one of them is wrong and the reader cannot tell which. This is the same fault
the leaseless-bound comment had, one commit earlier.

What it says instead is what is actually load-bearing: `<app>_directories` is
the only form on the wire, and `chat_directory` below is safe as a second name
for one of them because `_app_directories_ctx` derives it on every build rather
than storing it alongside — which is precisely what the removed scalars did not
do.

daemon.py had the same stale reference three lines from the code that produces
these, pointing at `video_root` for the shape a per-group signed setting takes.

Comments only; no behaviour change. Node suite green.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YVoHVCcfBqud6ZjG4db3y7

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