v0.1.21

Changelog

• 364d2b5 docs: changelog for v0.1.21
• 30e04eb feat(cli): release pinning + monorepo path filters for auto-deploy
• a1c2b83 feat(cli): teploy remove — retire an app (containers, route, state)
• 3d60444 feat(deploy): rule-based failure diagnosis — 'Likely cause' + 'Try' on failed deploys
• d5fc593 feat(deploy): zero-config first run — deploy with no teploy.yml offers inline init