Bootstrap geth Rust workspace

crates/geth-discovery/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "geth-discovery"
+version = "0.1.0"
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+
+[dependencies]
+serde.workspace = true
+geth-types = { path = "../geth-types" }

crates/geth-discovery/src/lib.rs

@@ -0,0 +1,18 @@
+use geth_types::NodeId;
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct PeerCard {
+    pub node: NodeId,
+    pub endpoints: Vec<String>,
+    pub signed_by: String,
+}
+
+pub trait DiscoveryBackend {
+    fn candidates(&self) -> Vec<PeerCard>;
+}
+
+#[must_use]
+pub fn discovery_is_untrusted_note() -> &'static str {
+    "discovery returns candidate peers only and never grants trust or authorization"
+}