docs: document the queried key, mark server as unbuilt

The contacts spec's manifest example carried a "server" field that no code
ever wrote, while resolve() writes a "queried" key the spec never defined.
They are not the same fact under two names: "queried" is what was asked
about, the name the label walk landed on, and "server" is who was asked,
the RDAP endpoint the bootstrap selected.

Document "queried" as shipped, and record "server" as specified but not
built, with the condition that would earn it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Xj1ayFRSUQ2u7cwb3S4axE

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