describe-changes@v1: with concatenate mode: append

✨ PR Description

Purpose: Update Hello Theme repository with improved reliability features and modernized build configurations for CI/CD workflows.
Main changes:

• Added WordPress environment retry logic with 5 attempts and automated failure recovery
• Implemented hardcoded "hello-theme" naming convention for build artifacts replacing package.json-based naming
• Updated GitHub Actions dependencies including peter-evans/create-pull-request from v5 to v6
• Fixed version regex pattern in functions.php update script

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