docs(deploy): document CodeBuild as alternative deployment path

Author: razkenari

docs/DEPLOYMENT.md

@@ -6,7 +6,9 @@ This guide walks you through deploying the Fullstack AgentCore Solution Template
 
 ## Prerequisites
 
-Before deploying, ensure you have:
+> **Note:** If you prefer not to install local tooling, see [Option A: Deploy via CodeBuild](#option-a-deploy-via-codebuild) — requires only Python 3.8+ and AWS CLI.
+
+For local deployment (Option B), ensure you have:
 
 - **Node.js 20+** installed (see [AWS guide for installing Node.js on EC2](https://docs.aws.amazon.com/sdk-for-javascript/v2/developer-guide/setting-up-node-on-ec2-instance.html))
 - **AWS CLI** configured with credentials (`aws configure`) - see [AWS CLI Configuration guide](https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-quickstart.html)
@@ -144,7 +146,13 @@ The CDK stack auto-creates a security group for the AgentCore Runtime. This same
 ## Deployment Steps
 
 ### TL;DR version
-Here are the commands to deploy backend and frontend:
+
+**No local tooling (just Python + AWS CLI):**
+```bash
+python scripts/deploy-with-codebuild.py
+```
+
+**Full local setup (Node.js + Docker + CDK):**
 ```bash
 cd infra-cdk
 npm install
@@ -154,16 +162,33 @@ cd ..
 python scripts/deploy-frontend.py
 ```
 
-### Deploy Without Local Tooling (via CodeBuild)
+### Option A: Deploy via CodeBuild
+
+Requires only Python 3.8+ and AWS CLI — no Node.js, Docker, or CDK needed.
 
-If you don't have Node.js, Docker, or CDK installed locally, you can deploy entirely in the cloud using a temporary CodeBuild project. Requires only Python 3.8+ and AWS CLI:
+1. Edit `infra-cdk/config.yaml` (see [Configuration](#configuration) above)
+2. Run:
 
 ```bash
 python scripts/deploy-with-codebuild.py
 ```
 
+The script packages your source, creates (or reuses) a CodeBuild project, and runs the full CDK + frontend deploy in the cloud. Build logs stream to your terminal.
+
+To remove the persistent CodeBuild resources when done:
+
+```bash
+python scripts/cleanup-codebuild-project.py
+```
+
 See `scripts/README.md` for details and required IAM permissions.
 
+---
+
+### Option B: Deploy Locally (CDK + Docker)
+
+This path requires the full set of prerequisites listed above (Node.js, Docker, CDK, Python).
+
 ### 1. Install Dependencies
 
 Install infrastructure dependencies:
@@ -280,7 +305,13 @@ cd infra-cdk
 cdk destroy --force
 ```
 
-**Warning**: This will delete all data including S3 buckets created during deployment and ECR images.
+If you deployed via CodeBuild (Option A), also remove the persistent build resources:
+
+```bash
+python scripts/cleanup-codebuild-project.py
+```
+
+**Warning**: `cdk destroy` will delete all data including S3 buckets created during deployment and ECR images.
 
 ## Troubleshooting