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b6c19b415d
libp2p was pulled in solely for its `minprotobuf` field codec, dragging in its full transitive tree (secp256k1, nimcrypto, websock, etc.). Swap it for nim-protobuf-serialization, whose low-level `codec` module gives the same protobuf wire primitives without the networking stack. The wire/snapshot codecs build messages by hand at the field level and rely on a backward-compatible decode path the type-driven `Protobuf.encode/decode` API cannot express. To keep that code intact, `protobufutil.nim` is a thin `ProtoBuffer` shim over the new `codec` module, preserving the exact field-level behaviour the codecs depend on (plain varints, length-delimited bytes/strings with no UTF-8 validation, unknown-wire-type fields skipped as protoc does). Dependency closure (nimble.lock, nix/deps.nix) regenerated accordingly: libp2p and its 8 exclusive transitive deps dropped, protobuf_serialization and its npeg dependency added. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>