feat(core): NodeEvent with counted drop reporting

tines-core/src/node.rs

@@ -11,8 +11,8 @@
 //! transport frames are dropped by the [`Exchange`].
 
 use crate::{
-    consts, BeliefPolicy, ConfidenceEvent, Exchange, NodeId, Observation, ObservationId, Payload,
-    Store, StoreError, Tick, Topic, Transport, TrimPolicy,
+    consts, BeliefPolicy, Exchange, NodeEvent, NodeId, Observation, ObservationId, Payload, Store,
+    StoreError, Tick, Topic, Transport, TrimPolicy,
 };
 
 /// Errors returned by [`Node::observe`].
@@ -165,15 +165,20 @@ impl<S: Store, T: Transport> Node<S, T> {
         stored
     }
 
-    /// Drains the buffered [`ConfidenceEvent`]s the [`Exchange`] has collected
-    /// as a peer acknowledged holding one of our broadcasts, oldest-first.
+    /// Drains the [`NodeEvent`]s the [`Exchange`] has collected: confirmed
+    /// deliveries first (oldest-first), then one [`NodeEvent::Dropped`] per
+    /// counted drop.
     ///
     /// The returned [`heapless::Vec`] is capped at
-    /// [`consts::EVENT_QUEUE_CAP`] entries and is empty once drained (a second
-    /// drain yields nothing). Index it directly — [`ConfidenceEvent::peer`]
-    /// names who received our broadcast and [`ConfidenceEvent::id`] is the
-    /// broadcast's content-ID.
-    pub fn drain_events(&mut self) -> heapless::Vec<ConfidenceEvent, { consts::EVENT_QUEUE_CAP }> {
+    /// [`consts::EVENT_QUEUE_CAP`] confirmed deliveries plus the entire
+    /// [`consts::DROP_TABLE_CAP`]-entry drop table and its overflow slot. Index
+    /// it directly — a [`NodeEvent::Delivered`] names the peer that held our
+    /// broadcast and the broadcast's content-ID; a [`NodeEvent::Dropped`] names
+    /// the peer and reason a dropped frame was rejected with.
+    pub fn drain_events(
+        &mut self,
+    ) -> heapless::Vec<NodeEvent<T::Addr>, { consts::EVENT_QUEUE_CAP + consts::DROP_TABLE_CAP + 1 }>
+    {
         self.exchange.drain_events()
     }