v0.37.18

Claude Code's default model is now claude-sonnet-5.5

A task on the Claude Code base that names no model now runs claude-sonnet-5.5 instead of claude-sonnet-4.6. claude-sonnet-4.6 is still offered, and a harness with its own saved default keeps it.

If you're upgrading from before 0.37.17, read the 0.37.17 notes first. That release closes critical security issues.

Full Changelog: v0.37.17...v0.37.18