Default the CLI to autoDetectMode() from @hachej/boring-agent/server
when neither --mode nor BORING_MODE is provided: Linux+bwrap selects
local-sandbox, everywhere else falls back to local (direct). Updates
help text and bumps to 0.1.25.

Co-authored-by: hachej <hachej@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>