Eclipse-mitigation wrapper for macula_resolve_address.

Phase 4.4 — see PLAN_MACULA_NET_PHASE4_4_RESOLVE_QUORUM.md.

Wraps a list of find_fn callbacks (each backed by a different DHT endpoint) into a single find_fn that fans out in parallel, requires M of N to return byte-equal records, and reports disagreement as {error, eclipse_suspected}.

Signature-based comparison: two records "agree" iff their Ed25519 signatures are byte-equal — the strongest possible check short of full payload equality, and equivalent in practice because the signing operation is deterministic over the canonical CBOR encoding of the payload.