Fix: Javadoc formatting in spec classes

Removed excessive newlines from Javadoc comments in several classes
in the io.a2a.spec package, and corrected a misplaced @param tag in
SubscribeToTaskRequest.

Author: kabir

spec/src/main/java/io/a2a/spec/GetAuthenticatedExtendedCardRequest.java

@@ -73,66 +73,32 @@ private Builder() {
         }
 
         /**
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          * Sets the JSON-RPC version.
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          *
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          * @param jsonrpc the JSON-RPC version
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          * @return this builder for method chaining
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          */
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         public GetAuthenticatedExtendedCardRequest.Builder jsonrpc(String jsonrpc) {
             this.jsonrpc = jsonrpc;
             return this;
         }
 
         /**
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          * Sets the request ID.
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          *
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          * @param id the request ID
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          * @return this builder for method chaining
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          */
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         public GetAuthenticatedExtendedCardRequest.Builder id(Object id) {
             this.id = id;
             return this;
         }
 
         /**
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          * Builds the instance.
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          *
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          * @return a new instance
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          */
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         public GetAuthenticatedExtendedCardRequest build() {
             if (id == null) {
                 id = UUID.randomUUID().toString();

spec/src/main/java/io/a2a/spec/GetAuthenticatedExtendedCardResponse.java

@@ -31,45 +31,21 @@ public GetAuthenticatedExtendedCardResponse(String jsonrpc, Object id, AgentCard
     }
 
     /**
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      * Constructs error response.
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      *
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      * @param id the request ID
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      * @param error the error
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      */
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     public GetAuthenticatedExtendedCardResponse(Object id, JSONRPCError error) {
         this(null, id, null, error);
     }
 
     /**
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      * Constructs successful response.
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      *
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      * @param id the request ID
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      * @param result the agent card result
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      */
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     public GetAuthenticatedExtendedCardResponse(Object id, AgentCard result) {
         this(null, id, result, null);
     }

spec/src/main/java/io/a2a/spec/GetTaskPushNotificationConfigParams.java

@@ -82,89 +82,43 @@ private Builder() {
         }
 
         /**
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          * Sets the task ID.
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          *
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          * @param id the task ID
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          * @return this builder for method chaining
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          */
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         public Builder id(String id) {
             this.id = id;
             return this;
         }
 
         /**
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          * Sets the push notification configuration ID.
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          *
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          * @param pushNotificationConfigId the configuration ID
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          * @return this builder for method chaining
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          */
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         public Builder pushNotificationConfigId(String pushNotificationConfigId) {
             this.pushNotificationConfigId = pushNotificationConfigId;
             return this;
         }
 
         /**
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          * Sets the tenant.
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          *
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          * @param tenant the tenant
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          * @return this builder for method chaining
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          */
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         public Builder tenant(String tenant) {
             this.tenant = tenant;
             return this;
         }
 
         /**
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          * Builds the parameters instance.
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          *
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          * @return a new GetTaskPushNotificationConfigParams
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          */
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         public GetTaskPushNotificationConfigParams build() {
             return new GetTaskPushNotificationConfigParams(id, pushNotificationConfigId, tenant == null ? "" : tenant);
         }

spec/src/main/java/io/a2a/spec/GetTaskPushNotificationConfigRequest.java

@@ -18,31 +18,15 @@
 public final class GetTaskPushNotificationConfigRequest extends NonStreamingJSONRPCRequest<GetTaskPushNotificationConfigParams> {
 
     /** The JSON-RPC method name. */
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     public static final String METHOD = "GetTaskPushNotificationConfig";
 
     /**
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      * Constructs request with all parameters.
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      *
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      * @param jsonrpc the JSON-RPC version
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      * @param id the request ID
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      * @param params the request parameters
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      */
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     public GetTaskPushNotificationConfigRequest(String jsonrpc, Object id, GetTaskPushNotificationConfigParams params) {
         super(jsonrpc, METHOD, id, params);
     }
@@ -67,14 +51,8 @@ public static Builder builder() {
     }
 
     /**
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      * Builder for constructing instances.
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      */
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     public static class Builder {
         private String jsonrpc;
         private Object id;
@@ -120,20 +98,10 @@ public GetTaskPushNotificationConfigRequest.Builder params(GetTaskPushNotificati
         }
 
         /**
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          * Builds the instance.
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          *
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          * @return a new instance
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          */
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         public GetTaskPushNotificationConfigRequest build() {
             if (id == null) {
                 id = UUID.randomUUID().toString();

spec/src/main/java/io/a2a/spec/GetTaskRequest.java

@@ -19,53 +19,25 @@
 public final class GetTaskRequest extends NonStreamingJSONRPCRequest<TaskQueryParams> {
 
     /** The JSON-RPC method name. */
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     public static final String METHOD = "GetTask";
 
     /**
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      * Constructs request with all parameters.
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      *
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      * @param jsonrpc the JSON-RPC version
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      * @param id the request ID
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      * @param params the request parameters
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      */
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     public GetTaskRequest(String jsonrpc, Object id, TaskQueryParams params) {
         super(jsonrpc, METHOD, id, params);
     }
 
     /**
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      * Constructs request with ID and parameters.
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      *
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      * @param id the request ID
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      * @param params the request parameters
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      */
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     public GetTaskRequest(Object id, TaskQueryParams params) {
         this(null, id, params);
     }
@@ -127,20 +99,10 @@ public GetTaskRequest.Builder params(TaskQueryParams params) {
         }
 
         /**
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          * Builds the instance.
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          *
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          * @return a new instance
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          */
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         public GetTaskRequest build() {
             if (id == null) {
                 id = UUID.randomUUID().toString();