Add NIGHTOWL_APP_ID config so issue.new webhooks include app_id and a
per-app dashboard view_url, matching the backend's issue.resolved/ignored
/reopened payload shape. AlertNotifier now enriches issues with status +
priority. PruneCommand prunes nightowl_logs. Drop REVIEW.md, add
CONTRIBUTING, LICENSE, ISSUE_TEMPLATE, FUNDING.yml, README rewrite.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>