abra does NOT write STACK_NAME to the app's .env file — it derives it at runtime by replacing dots with underscores (e.g. gite-e1cb78.ci.commoninternet.net → gite-e1cb78_ci_commoninternet_net). Build #691 failed with 'STACK_NAME not found' because the env file read was looking for a key that doesn't exist. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>