Add the admin messages, approval ids as numbers, and two turn events

Implemented-By: OpenCode session (model recorded in docs/implementer-log.md)

crates/bxctl/src/chat.rs

@@ -51,6 +51,8 @@ fn code_name(code: ErrorCode) -> &'static str {
         ErrorCode::NoSuchSession => "no such session",
         ErrorCode::SessionExists => "session exists",
         ErrorCode::Inference => "inference",
+        ErrorCode::Forbidden => "forbidden",
+        ErrorCode::NoSuchApproval => "no such approval",
     }
 }
 
@@ -193,6 +195,8 @@ impl Printer {
                 writeln!(out, "[cache loss: {got} of {expected}]")?;
             }
             TurnEvent::Queued { .. } | TurnEvent::Progress { .. } => {}
+            // Printed from task 20 on; until then these events are not sent.
+            TurnEvent::ApprovalPending { .. } | TurnEvent::ToolDenied { .. } => {}
         }
         out.flush()
     }