include current wall clock in matrix_turn envelope

src/claude.rs

@@ -103,6 +103,10 @@ The room_id and other fields are explicit - use them in your tool calls.";
 struct MatrixTurn {
     #[serde(rename = "type")]
     kind: &'static str,
+    /// Current wall clock at turn-build time (unix seconds).
+    now: i64,
+    /// Current wall clock formatted YYYY-MM-DD HH:MM UTC.
+    now_human: String,
     room_id: String,
     room_name: String,
     room_notes_path: String,
@@ -137,8 +141,15 @@ fn build_turn(
         .map(|i| wire_event_from(i, read_markers))
         .collect();
 
+    let now = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .map(|d| d.as_secs() as i64)
+        .unwrap_or(0);
+
     MatrixTurn {
         kind: "matrix_turn",
+        now,
+        now_human: format!("{} UTC", format_ts(now)),
         room_id: source_room.as_str().to_owned(),
         room_name: room_name.to_owned(),
         room_notes_path: format!("../rooms/{source_room}/notes.md"),