bxcore, brokerd, loopd: an invalid-arguments denial says why

Co-Authored-By: ornith-1.5-35b-a3b <agent@wntrmute.dev>

crates/brokerd/src/broker.rs

@@ -251,7 +251,10 @@ pub fn handle(mut stream: UnixStream, broker: &Broker) {
     let now = Timestamp::now();
     let grants = broker.grants();
     let answer = match broker.ledger().decide(request, &grants, now) {
-        Decided::Denied(reason) => Some(ToolResponse::Denied { reason }), // 3a. denied
+        Decided::Denied(denial) => Some(ToolResponse::Denied {
+            reason: denial.reason,
+            detail: denial.detail,
+        }), // 3a. denied
         Decided::Allowed { decision, seq } => Some(run(broker, decision, seq)), // 3b. allowed
         Decided::Ask { ask, seq, state } => {
             pending(&mut stream, broker, id, ask, seq, state, now) // 3c. ask
@@ -334,7 +337,10 @@ fn pending(
     // 5. Answer from the verdict.
     match outcome {
         Ok(verdict) => match verdict {
-            Verdict::Denied(reason) => Some(ToolResponse::Denied { reason }),
+            Verdict::Denied(reason) => Some(ToolResponse::Denied {
+                reason,
+                detail: None,
+            }),
             Verdict::Run(decision) => {
                 let decision = *decision;
                 if !alive(stream) {
@@ -350,6 +356,9 @@ fn pending(
                 Some(run(broker, decision, seq))
             }
         },
-        Err(reason) => Some(ToolResponse::Denied { reason }),
+        Err(reason) => Some(ToolResponse::Denied {
+            reason,
+            detail: None,
+        }),
     }
 }