Adds the two missing cases that left lib/kernel/src/cli_install.dart:74 (default-environment constructor branch) and the builtin extension's stale-GUI activation warning uncovered. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Adds the two missing cases that left lib/kernel/src/cli_install.dart:74 (default-environment constructor branch) and the builtin extension's stale-GUI activation warning uncovered. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>