Lisa is smoother across Home, mobile, and long-running work

Lisa Home is now available to everyone, with daily brief loading that feels more automatic and less like a setup chore. We also added thread archiving, expanded Lisa's automation/tool coverage, improved prompt caching and retry behavior, tightened mobile controls, and made Lisa runtime health checks more resilient.

We're still formatting this release note for the site. Check back soon for the full write-up.