Move the 14 hack-house scripts (bootstrap, lets-hack, host-room, smoke,
demo/film harnesses, connect/join, ensure-docker/vbox) into hh/scripts/
and fix their path resolution for the deeper location. Update cross-refs:
sbx.rs script consts, app.rs hints, CI, direnv .envrc, README, and docs.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add the VirtualBox sandbox design spec (headless 4th backend + share-an-
appliance GUI mode with detect-first install), the crypto pay-to-join gate
design, and the save/load PoC writeup with its demo/film driver scripts.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>