Work on implementing the protocol.

src/protocol/introspection.rs

@@ -0,0 +1,32 @@
+//! Required introspection payloads.
+
+use alloc::{string::String, vec::Vec};
+use rkyv::{Archive, Deserialize, Serialize};
+
+/// Reserved procedure id for protocol introspection.
+pub const INTROSPECTION_PROCEDURE_ID: &str = "";
+
+/// Endpoint-wide introspection payload.
+#[derive(Archive, Serialize, Deserialize, Debug, Clone, PartialEq, Eq)]
+pub struct EndpointIntrospection {
+    /// Hosted leaves and their supported procedures.
+    pub leaves: Vec<LeafIntrospectionSummary>,
+}
+
+/// Shared per-leaf discovery record.
+#[derive(Archive, Serialize, Deserialize, Debug, Clone, PartialEq, Eq)]
+pub struct LeafIntrospectionSummary {
+    /// Local leaf name.
+    pub leaf_name: String,
+    /// Canonical procedure identifiers supported by the leaf.
+    pub procedures: Vec<String>,
+}
+
+/// Leaf-specific introspection payload.
+#[derive(Archive, Serialize, Deserialize, Debug, Clone, PartialEq, Eq)]
+pub struct LeafIntrospection {
+    /// Local leaf name.
+    pub leaf_name: String,
+    /// Canonical procedure identifiers supported by the leaf.
+    pub procedures: Vec<String>,
+}