docs: record the fourth property and the contacts command

An RDAP query discloses what the user is looking at, and property 1
covers only what is published, so the query rule needed stating in its
own right beside the other three. The section records the three leaks it
came from, because each one was the same shape: validation applied per
branch, forgotten on the next.

Also moves rdap.py's imports into one block at the top. Pure move, the
suite is 192 either side of it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wrfqr2xqQfhtXCscU7zrdz

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