hive-matrix-mcp: add send_redact tool to delete matrix events

hive-matrix-mcp/src/protocol.rs

@@ -92,6 +92,18 @@ pub enum DaemonOp {
     #[serde(rename = "mark_read")]
     MarkRead { room: String, event_id: String },
 
+    /// Redact `event_id` in `room` — ask the homeserver to strip the
+    /// event's content (matrix-spec `m.room.redaction`), optionally with
+    /// a human-readable `reason`. The agent must have a high enough power
+    /// level (its own events, or moderator rights for others'); the
+    /// server rejects otherwise.
+    #[serde(rename = "send_redact")]
+    SendRedact {
+        room: String,
+        event_id: String,
+        reason: Option<String>,
+    },
+
     /// List rooms the agent has joined. Returns each room's id +
     /// canonical alias (when present) + name + member count.
     #[serde(rename = "list_rooms")]
@@ -267,6 +279,33 @@ mod tests {
         matches!(back.op, DaemonOp::ListRooms);
     }
 
+    #[test]
+    fn send_redact_round_trips_with_optional_reason() {
+        let req = DaemonRequest {
+            account: None,
+            op: DaemonOp::SendRedact {
+                room: "!r:s".to_owned(),
+                event_id: "$e".to_owned(),
+                reason: Some("spam".to_owned()),
+            },
+        };
+        let line = serde_json::to_string(&req).unwrap();
+        assert!(line.contains("\"method\":\"send_redact\""), "wire: {line}");
+        let back: DaemonRequest = serde_json::from_str(&line).unwrap();
+        match back.op {
+            DaemonOp::SendRedact {
+                room,
+                event_id,
+                reason,
+            } => {
+                assert_eq!(room, "!r:s");
+                assert_eq!(event_id, "$e");
+                assert_eq!(reason.as_deref(), Some("spam"));
+            }
+            other => panic!("wrong variant: {other:?}"),
+        }
+    }
+
     #[test]
     fn unit_variant_op_parses_inside_envelope() {
         // A bare op with no fields still parses when wrapped.