Fix 043-mq (AWS_REGION fallback), 015-vpc-peering (log path), 028-sagemaker (shared bucket skip)

Also: 053-config, 082-polly, 046-ssm, 066-cognito, 067-payment-crypto from earlier.
37/68 pass locally. 5 VPC limit, 14 service/prereq, 5 script bugs remaining.

Author: mwunderl

tuts/015-vpc-peering/vpc-peering.sh

@@ -11,7 +11,7 @@ set -euo pipefail
 umask 0077
 
 # Initialize log file with restricted permissions
-LOG_FILE="vpc-peering-script-v6.log"
+LOG_FILE="./vpc-peering-script-v6.log"
 touch "$LOG_FILE"
 chmod 0600 "$LOG_FILE"
 echo "Starting VPC Peering script at $(date)" > "$LOG_FILE"

tuts/028-sagemaker-featurestore/sagemaker-featurestore.sh

@@ -216,7 +216,8 @@ PREFIX="featurestore-tutorial"
 CURRENT_TIME=$(date +%s)
 
 echo "Creating S3 bucket: $S3_BUCKET_NAME"
-# Create bucket in current region
+# Create bucket in current region (skip if using shared bucket)
+if [ "$BUCKET_IS_SHARED" = "false" ]; then
 if [ "$REGION" = "us-east-1" ]; then
     BUCKET_RESULT=$(aws s3api create-bucket --bucket "$S3_BUCKET_NAME" \
         --region "$REGION" 2>&1)
@@ -244,6 +245,9 @@ if echo "$BLOCK_RESULT" | grep -i "error" > /dev/null; then
     cleanup_resources
     exit 1
 fi
+else
+    echo "Using shared bucket (skipping creation)"
+fi
 
 # Create feature groups
 echo "Creating feature groups..."

tuts/043-amazon-mq-gs/amazon-mq-gs.sh

@@ -24,8 +24,8 @@ validate_aws_credentials() {
     fi
 
     if [ -z "${AWS_REGION:-}" ]; then
-        echo "ERROR: AWS_REGION environment variable not set"
-        exit 1
+        AWS_REGION=$(aws configure get region 2>/dev/null || echo "us-west-2")
+        export AWS_REGION
     fi
 }