update docs and examples to use child context logger

Author: zhongkechen

README.md

@@ -354,8 +354,8 @@ The SDK provides a `DurableLogger` via `ctx.getLogger()` that automatically incl
 protected OrderResult handleRequest(Order order, DurableContext ctx) {
     ctx.getLogger().info("Processing order: {}", order.getId());
 
-    var result = ctx.step("validate", String.class, () -> {
-        ctx.getLogger().debug("Validating order details");
+    var result = ctx.step("validate", String.class, stepCtx -> {
+        stepCtx.getLogger().debug("Validating order details");
         return validate(order);
     });
 

examples/src/main/java/software/amazon/lambda/durable/examples/CallbackExample.java

@@ -47,13 +47,13 @@ public String handleRequest(ApprovalRequest input, DurableContext context) {
         var callback = context.createCallback("approval", String.class, config);
 
         // Step 2.5: Log AWS CLI command to complete the callback
-        context.step("log-callback-command", Void.class, () -> {
+        context.step("log-callback-command", Void.class, ctx -> {
             var callbackId = callback.callbackId();
             // The result must be base64-encoded JSON
             var command = String.format(
                     "aws lambda send-durable-execution-callback-success --callback-id %s --result $(echo -n '\"approved\"' | base64)",
                     callbackId);
-            context.getLogger().info("To complete this callback, run: {}", command);
+            ctx.getLogger().info("To complete this callback, run: {}", command);
             return null;
         });
 

examples/src/main/java/software/amazon/lambda/durable/examples/ChildContextExample.java

@@ -31,7 +31,7 @@ public String handleRequest(GreetingRequest input, DurableContext context) {
         // Child context 1: Order validation — step + wait + step
         var orderFuture = context.runInChildContextAsync("order-validation", String.class, child -> {
             var prepared = child.step("prepare-order", String.class, () -> "Order for " + name);
-            context.getLogger().info("Order prepared, waiting for validation");
+            child.getLogger().info("Order prepared, waiting for validation");
 
             child.wait("validation-delay", Duration.ofSeconds(5));
 
@@ -41,7 +41,7 @@ public String handleRequest(GreetingRequest input, DurableContext context) {
         // Child context 2: Inventory check — step + wait + step
         var inventoryFuture = context.runInChildContextAsync("inventory-check", String.class, child -> {
             var stock = child.step("check-stock", String.class, () -> "Stock available for " + name);
-            context.getLogger().info("Stock checked, waiting for confirmation");
+            child.getLogger().info("Stock checked, waiting for confirmation");
 
             child.wait("confirmation-delay", Duration.ofSeconds(3));