Apply technical requirements (R1, R2, R9, R10, R13)

- R1: Add AWS_REGION to region fallback chain
- R2: Replace openssl rand with /dev/urandom
- R9: Remove Appendix/Generation details from READMEs
- R10: Remove internal references
- R13: Add REVISION-HISTORY.md

Author: mwunderl

tuts/090-amazon-comprehend-gs/README.md

@@ -45,15 +45,3 @@ Comprehend pricing is per unit (100 characters). This tutorial analyzes ~500 cha
 - [Sentiment analysis](https://docs.aws.amazon.com/comprehend/latest/dg/how-sentiment.html)
 - [Entity recognition](https://docs.aws.amazon.com/comprehend/latest/dg/how-entities.html)
 - [PII detection](https://docs.aws.amazon.com/comprehend/latest/dg/how-pii.html)
-
----
-
-## Appendix: Generation details
-
-| Field | Value |
-|-------|-------|
-| Generation date | 2026-04-14 |
-| Source script | New, 57 lines |
-| Script test result | EXIT 0, 5s, 5 steps, stateless API |
-| Issues encountered | None — stateless API, no resource management needed |
-| Iterations | v1 (direct to publish) |

tuts/090-amazon-comprehend-gs/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 090-amazon-comprehend-gs
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+

tuts/091-amazon-translate-gs/README.md

@@ -45,15 +45,3 @@ Translate pricing is per character. This tutorial translates ~600 characters, co
 - [Translating text using the API](https://docs.aws.amazon.com/translate/latest/dg/get-started-api.html)
 - [Supported languages](https://docs.aws.amazon.com/translate/latest/dg/what-is-languages.html)
 - [Automatic source language detection](https://docs.aws.amazon.com/translate/latest/dg/auto-detect.html)
-
----
-
-## Appendix: Generation details
-
-| Field | Value |
-|-------|-------|
-| Generation date | 2026-04-14 |
-| Source script | New, 60 lines |
-| Script test result | EXIT 0, 5s, 5 steps, stateless API |
-| Issues encountered | None — stateless API, no resource management needed |
-| Iterations | v1 (direct to publish) |

tuts/091-amazon-translate-gs/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 091-amazon-translate-gs
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+

tuts/103-amazon-textract-gs/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 103-amazon-textract-gs
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+

tuts/103-amazon-textract-gs/amazon-textract-gs.sh

@@ -15,7 +15,7 @@ export AWS_DEFAULT_REGION="$REGION"
 ACCOUNT_ID=$(aws sts get-caller-identity --query 'Account' --output text)
 echo "Region: $REGION"
 
-RANDOM_ID=$(openssl rand -hex 4)
+RANDOM_ID=$(cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 8 | head -n 1)
 BUCKET_NAME="textract-tut-${RANDOM_ID}-${ACCOUNT_ID}"
 
 handle_error() { echo "ERROR on line $1"; trap - ERR; cleanup; exit 1; }

tuts/104-amazon-polly-gs/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 104-amazon-polly-gs
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+

tuts/105-amazon-rekognition-gs/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 105-amazon-rekognition-gs
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+

tuts/105-amazon-rekognition-gs/amazon-rekognition-gs.sh

@@ -15,7 +15,7 @@ export AWS_DEFAULT_REGION="$REGION"
 ACCOUNT_ID=$(aws sts get-caller-identity --query 'Account' --output text)
 echo "Region: $REGION"
 
-RANDOM_ID=$(openssl rand -hex 4)
+RANDOM_ID=$(cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 8 | head -n 1)
 BUCKET_NAME="rekognition-tut-${RANDOM_ID}-${ACCOUNT_ID}"
 
 handle_error() { echo "ERROR on line $1"; trap - ERR; cleanup; exit 1; }