docs: correct the Accept header and the dependency claim

The spec named a strict Accept: application/rdap+json while the plan, and
so the code, sends application/rdap+json with application/json at q=0.9.
A spec review caught the disagreement. The wider header is the right
behaviour, since some registries serve plain application/json and a
strict header would lose a contact that was published, so the spec moves
to match the code and now records why.

Both documents also claimed requirements.txt stays empty. There is no
requirements.txt in this repository and there never has been, so the
claim was true only vacuously. They now say the tool declares no
dependencies, which is the thing actually being promised.

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

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