agent: add Wake command - co-process self-wake via agent socket

hive-sh4re/src/lib.rs

@@ -218,6 +218,13 @@ pub enum AgentRequest {
         #[serde(default)]
         ttl_seconds: Option<u64>,
     },
+    /// Deliver a message TO this agent from a co-process (e.g. a Matrix
+    /// daemon running in the same container). `from` identifies the sender
+    /// (e.g. `"matrix"`); `body` is a short summary. Unlike `Send`, the
+    /// recipient is always the agent that owns this socket — no `to` field.
+    /// Wakes whatever `Recv` the harness is parked on, triggering the next
+    /// claude turn.
+    Wake { from: String, body: String },
 }
 
 /// Responses on a per-agent socket.