Failures now launch an interactive Claude session instead of the
non-interactive assist (REASON/COMMAND parser). The user debugs
with full terminal access and types /exit to return to setup.
The original assist mode is available via --assist-mode flag or
NANOCLAW_SETUP_ASSIST_MODE=1 env var.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>