Adds a GitHub Actions workflow and Bun script to automatically comment on issues when lifecycle labels (needs-info/needs-repro/invalid/stale/autoclose) are applied, explaining what’s needed and the auto-close timeline, and refactors lifecycle labels/timeouts/messages into a shared config used by both the sweep and comment scripts. This improves issue triage transparency and keeps timeouts/messages consistent across automation. Concerns: the workflow triggers on every label event (relying on a script no-op), could generate duplicate or noisy comments if labels are toggled/reapplied, and the automation depends on Bun/GitHub API permissions and message wording being appropriate for all cases.