v0.26.23

Tip 19 reframed: isolated environments

Tip 19 is now "Isolated environments for long-running risky tasks" (was "Containers for long-running risky tasks"). It's tightened up and now presents two ways to get isolation:

1. Run Claude Code in a container (preset environment)
2. Go further: set up a whole machine Claude Code can fully control, computer use included - a new step-by-step guide