Review a configuration change for unintended effects

Given [CONFIG DIFF], [ENVIRONMENTS] and [SERVICE CONTRACT], review each changed setting for type, scope, default, secret exposure and downstream effect. Produce a table of expected behaviour by environment, validation commands, rollback steps and unanswered questions. Do not deploy or assume the change is safe because syntax parses. Include tests for missing variables and stale processes. Check that example values cannot be mistaken for production secrets and that the rollback restores both the file and any runtime state affected by the setting.