Remove json tags from internal structs

JSON marshaling uses field names directly; explicit tags
are unnecessary at this level.

Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>

pkg/agent/approval.go

@@ -29,8 +29,8 @@ type (
 	}
 
 	ApprovalResult struct {
-		Approved bool   `json:"approved"`
-		Message  string `json:"message"`
+		Approved bool
+		Message  string
 	}
 
 	ResumeInput struct {