test(node): keep the transfer probe in the repo

It lived in `QE/`, which is deliberately not versioned — credentials and test
artefacts go there — so a tool that found several defects no test in the suite
could reach existed on exactly one machine.

What it found, none of it reachable from pytest: a cap that was never enforced,
a queue that granted a slot and never told the peer waiting on it, leases that
outlived the session holding them, and `transfers show` reporting the module
defaults instead of the operator's own values.

Not collected: the filename does not match `test_*.py`, and that is the point.
It talks to a real hub with real credentials and takes minutes; what belongs in
the suite is already there.

It still needs two things from `QE/`, which stay out of the repo: `e2e.py`, the
second implementation of the client whose `Client` speaks MNP over a real
WebRTC DataChannel, and `demo.env`. Both are located at run time and their
absence is explained in a sentence rather than raised as an ImportError from
four frames down.

Verified from the new location against the live node: 4/4.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HCGdheDLxGReuKHga3BtST

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