Document fire-and-forget transaction mode

Add godoc to Create and CreateBulk explaining they return immediately
without waiting for block inclusion. Update package-level example to show
both fire-and-forget and wait-for-block patterns. Add Transaction Modes
section to README with code examples.

README.md

@@ -65,6 +65,57 @@ func main() {
 }
 ```
 
+## Transaction Modes
+
+`Create` and `CreateBulk` return **immediately** with the assigned transaction ID(s). They do **not** wait for block inclusion. Blocks are assembled asynchronously on a ~5-second cycle.
+
+### Fire and Forget
+
+Most use cases only need the transaction ID. No polling required.
+
+```go
+ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+defer cancel()
+
+resp, err := client.Transaction.Create(ctx, &models.TransactionCreateRequest{
+    TxnType: "my-transaction-type",
+    Payload: `{"message": "Hello Dragonchain"}`,
+})
+if err != nil {
+    log.Fatal(err)
+}
+fmt.Printf("Transaction ID: %s\n", resp.TransactionID)
+// Done — no need to wait for a block.
+```
+
+### Wait for Block
+
+If you need the block ID (e.g. for interchain verification or Daria), poll `Get` until `Header.BlockId` is populated.
+
+```go
+resp, err := client.Transaction.Create(ctx, &models.TransactionCreateRequest{
+    TxnType: "my-transaction-type",
+    Payload: `{"message": "Hello Dragonchain"}`,
+})
+if err != nil {
+    log.Fatal(err)
+}
+
+// Poll until the transaction is included in a block.
+ticker := time.NewTicker(2 * time.Second)
+defer ticker.Stop()
+for range ticker.C {
+    txn, err := client.Transaction.Get(ctx, resp.TransactionID)
+    if err != nil {
+        log.Fatal(err)
+    }
+    if txn.Header.BlockId != "" {
+        fmt.Printf("Block ID: %s\n", txn.Header.BlockId)
+        break
+    }
+}
+```
+
 ## Available Endpoints
 
 All API methods accept a `context.Context` as their first parameter for timeout and cancellation control.

dragonchain.go

@@ -2,21 +2,8 @@
 //
 // All API methods require a context.Context parameter for timeout and cancellation control.
 //
-// Example usage:
+// Example — fire and forget (most use cases):
 //
-//	package main
-//
-//	import (
-//	    "context"
-//	    "fmt"
-//	    "log"
-//	    "time"
-//
-//	    "git.dragonchain.com/dragonchain/prime-sdk-go"
-//	    "git.dragonchain.com/dragonchain/prime-sdk-go/models"
-//	)
-//
-//	func main() {
 //	client := sdk.NewDragonchainSDK(
 //	    "your-public-id",
 //	    "your-auth-key-id",
@@ -27,22 +14,38 @@
 //	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
 //	defer cancel()
 //
-//	    // Check system health
-//	    if err := client.System.Health(ctx); err != nil {
-//	        log.Fatal(err)
-//	    }
-//
-//	    // Create a transaction
-//	    txn := &models.TransactionCreateRequest{
+//	resp, err := client.Transaction.Create(ctx, &models.TransactionCreateRequest{
 //	    TxnType: "my-transaction-type",
-//	        Payload: map[string]interface{}{"message": "Hello Dragonchain"},
-//	    }
-//
-//	    resp, err := client.Transaction.Create(ctx, txn)
+//	    Payload: `{"message": "Hello Dragonchain"}`,
+//	})
 //	if err != nil {
 //	    log.Fatal(err)
 //	}
-//	    fmt.Printf("Created transaction: %s\n", resp.TransactionID)
+//	fmt.Printf("Transaction ID: %s\n", resp.TransactionID)
+//	// Done — no need to wait for a block.
+//
+// Example — wait for block inclusion (interchain / Daria):
+//
+//	resp, err := client.Transaction.Create(ctx, &models.TransactionCreateRequest{
+//	    TxnType: "my-transaction-type",
+//	    Payload: `{"message": "Hello Dragonchain"}`,
+//	})
+//	if err != nil {
+//	    log.Fatal(err)
+//	}
+//
+//	// Poll until the transaction is included in a block.
+//	ticker := time.NewTicker(2 * time.Second)
+//	defer ticker.Stop()
+//	for range ticker.C {
+//	    txn, err := client.Transaction.Get(ctx, resp.TransactionID)
+//	    if err != nil {
+//	        log.Fatal(err)
+//	    }
+//	    if txn.Header.BlockId != "" {
+//	        fmt.Printf("Block ID: %s\n", txn.Header.BlockId)
+//	        break
+//	    }
 //	}
 package sdk
 

transaction/transaction.go

@@ -16,6 +16,10 @@ func NewTransactionClient(c *client.Client) *TransactionClient {
 	return &TransactionClient{client: c}
 }
 
+// Create submits a new transaction and returns immediately with the assigned transaction ID.
+// It does NOT wait for the transaction to be included in a block. Block processing happens
+// asynchronously on a ~5-second cycle. If you need the block ID (e.g. for interchain
+// verification), poll Get until Header.BlockId is populated.
 func (tc *TransactionClient) Create(ctx context.Context, req *models.TransactionCreateRequest) (*models.TransactionCreateResponse, error) {
 	var resp models.TransactionCreateResponse
 	err := tc.client.Post(ctx, "/api/v1/transaction", models.ContentTypeJSON, req, &resp)
@@ -25,6 +29,10 @@ func (tc *TransactionClient) Create(ctx context.Context, req *models.Transaction
 	return &resp, nil
 }
 
+// CreateBulk submits multiple transactions and returns immediately with the assigned transaction IDs.
+// It does NOT wait for the transactions to be included in a block. Block processing happens
+// asynchronously on a ~5-second cycle. If you need block IDs, poll Get for each transaction
+// until Header.BlockId is populated.
 func (tc *TransactionClient) CreateBulk(ctx context.Context, req *models.TransactionBulkRequest) (*models.TransactionBulkResponse, error) {
 	var resp models.TransactionBulkResponse
 	err := tc.client.Post(ctx, "/api/v1/transaction/bulk", models.ContentTypeJSON, req, &resp)