Address PR review comments

- go/session.go: guard against nil PermissionDecision from handler
- go/README.md: fix non-compiling permission handler example
- python/README.md: fix PermissionDecision* import path

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: SteveSandersonMS

go/README.md

@@ -595,6 +595,8 @@ Provide your own `PermissionHandlerFunc` to inspect each request and apply custo
 
 ```go
 import (
+    "fmt"
+
     copilot "github.com/github/copilot-sdk/go"
     "github.com/github/copilot-sdk/go/rpc"
 )
@@ -605,9 +607,8 @@ session, err := client.CreateSession(context.Background(), &copilot.SessionConfi
         // Type-switch on the discriminated PermissionRequest variants to
         // access per-kind fields:
         if shell, ok := request.(*copilot.PermissionRequestShell); ok {
-            return &rpc.PermissionDecisionReject{
-                Feedback: pointer(fmt.Sprintf("Refusing shell: %s", shell.FullCommandText)),
-            }, nil
+            feedback := fmt.Sprintf("Refusing shell: %s", shell.FullCommandText)
+            return &rpc.PermissionDecisionReject{Feedback: &feedback}, nil
         }
         return &rpc.PermissionDecisionApproveOnce{}, nil
     },

go/session.go

@@ -1151,6 +1151,15 @@ func (s *Session) executePermissionAndRespond(requestID string, permissionReques
 		})
 		return
 	}
+	if decision == nil {
+		// Handler returned (nil, nil); treat as user-not-available rather
+		// than sending null on the wire.
+		s.RPC.Permissions.HandlePendingPermissionRequest(context.Background(), &rpc.PermissionDecisionRequest{
+			RequestID: requestID,
+			Result:    &rpc.PermissionDecisionUserNotAvailable{},
+		})
+		return
+	}
 	if _, ok := decision.(*rpc.PermissionDecisionNoResult); ok {
 		return
 	}

python/README.md

@@ -575,11 +575,11 @@ Provide your own function to inspect each request and apply custom logic (sync o
 
 ```python
 from copilot import PermissionRequest, PermissionRequestResult
-from copilot.generated.session_events import (
+from copilot.generated.rpc import (
     PermissionDecisionApproveOnce,
     PermissionDecisionReject,
-    PermissionRequestShell,
 )
+from copilot.generated.session_events import PermissionRequestShell
 
 
 def on_permission_request(