Sync mermaid diagram and fix README navigation

- Sync web app mermaid with README: fix x3→×3, S3 label, add color styles
- Fix 02-e2e-testing Next link to point to 03-iam-enforcement
- Add 03-vscode-debugging to repo layout in main README
- Update prerequisites: remove stale "module 03" VS Code reference
- Makefile: fix LAMBDA_DEBUG_MODE env var names (previous commit)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: whummer

01-serverless-app/website/index.html

@@ -426,7 +426,7 @@ <h2>What is this?</h2>
     OH -->|put_item| DDB[(DynamoDB\norders)]
     OH -->|scan| PDDB[(DynamoDB\nproducts)]
     OH -->|send_message| SQS[SQS Queue]
-    SQS -->|on failure x3| DLQ[SQS DLQ]
+    SQS -->|on failure ×3| DLQ[SQS DLQ]
     SQS --> OP[Lambda\norder-processor]
     OP -->|start_execution| SFN[Step Functions]
     SFN --> V[Validate\nLambda]
@@ -435,7 +435,11 @@ <h2>What is this?</h2>
     V -->|update status| DDB
     P -->|update status| DDB
     ECS -->|update status| DDB
-    ECS -->|put_object| S3[(S3 Receipts)]
+    ECS -->|put_object| S3[(S3\nReceipts)]
+
+    style DLQ fill:#fde8e8,stroke:#e8412a,color:#c0392b
+    style SFN fill:#e0d7ff,stroke:#4a1a8a,color:#4a1a8a
+    style ECS fill:#d7f0e0,stroke:#1a7a40,color:#1a7a40
         </div>
       </div>
 

02-e2e-testing/README.md

@@ -46,4 +46,4 @@ awslocal sqs get-queue-attributes \
 
 ---
 
-Next: [Module 03 — Lambda Debugging](../03-vscode-debugging/README.md)
+Next: [Module 03 — IAM Enforcement](../03-iam-enforcement/README.md)

Makefile

@@ -14,8 +14,8 @@ start: ## Start LocalStack in the background
 
 debug-start: ## Start LocalStack with Lambda debug mode enabled (port 19891)
 	LOCALSTACK_APPINSPECTOR_ENABLE=1 LOCALSTACK_APPINSPECTOR_DEV_ENABLE=1 \
-	  LAMBDA_DEBUG_MODE=1 \
-	  LOCALSTACK_DOCKER_FLAGS="-v $(PWD)/.localstack:/tmp/ls-debug" \
+	  LOCALSTACK_LAMBDA_DEBUG_MODE=1 \
+	  DOCKER_FLAGS="-v $(PWD)/.localstack:/tmp/ls-debug" \
 	  LAMBDA_DEBUG_MODE_CONFIG_PATH=/tmp/ls-debug/lambda_debug_mode.yaml localstack start -d
 
 hot-reload: ## Switch order-handler to hot-reload mode (edits take effect immediately)

README.md

@@ -4,7 +4,7 @@ Hands-on workshop: local serverless development with [LocalStack](https://locals
 
 **Duration:** ~3 hours  
 **Level:** Intermediate  
-**Prerequisites:** Docker, Python 3.10+, Terraform, VS Code (for module 03)
+**Prerequisites:** Docker, Python 3.10+, Terraform, VS Code (for Lambda debugging)
 
 ---
 
@@ -96,6 +96,7 @@ localstack-workshop/
 │   └── website/               # S3-hosted UI (HTML/JS, no build step)
 ├── 02-e2e-testing/        # pytest test suite
 ├── 03-iam-enforcement/    # IAM enforcement demo & fix policy
+├── 03-vscode-debugging/   # Lambda remote debugging with VS Code AWS Toolkit
 ├── 04-chaos-engineering/  # fault injection scripts & DLQ replay
 ├── 05-app-inspector/      # App Inspector walkthrough
 ├── 06-ai-integration/     # MCP server + LocalStack skills demo