Release v3.7.0

Added

• --dry-run on cratis ai install, cratis ai update and cratis ai uninstall. It reports the changes that would be made and writes nothing, so a run can be reviewed before it happens — which matters because the corpus is unpinned and an update takes whatever the source currently holds. The output is the same actions and conflicts a real run produces, plus dryRun, so --output json keeps working for scripting.