discv5-theory: document topic-distance hint and split lookup/registration responses into matches + auxiliary#3
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This was referenced May 15, 2026
…lookup responses The Lookup Responses section says the registrar "may also return additional ENRs selected from its view of the service table" but doesn't specify how the selection is made. Add a recommended algorithm: when the wire-format request carries a list of topic-distances at which the requester's service table has free space, the registrar selects at most one ENR per requested distance from the corresponding bucket of its own B(s), up to an implementation-defined total cap. One-per-distance keeps responses compact and spreads coverage across the requester's free buckets rather than overrepresenting a single distance. Companion to the wire-spec definition of the topic-distance list in REGTOPIC and TOPICQUERY.
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Some additions to theory complementing the wire-spec changes in #2.