v0.9.0-rc.3

Changelog

• 5c7b4eb: fix(burrowd): bound each database-wait attempt so startup retries fast (#213) (@incognick)
• e7004e6: feat(cli): fold env scan into env list --discover (#214) (@incognick)
• 6f0d078: feat(cluster): bootstrap RAM preflight sets a 2GB minimum with a memory breakdown (#215) (@incognick)