Direct reference adapter
Add Dockerfile, compile.sh, run.sh, solve.sh and optional oracle helpers.
The offline fixture includes demo.owner@asana.example.test with password
AsanaDemo2026!. Sign in through /-/login or POST /api/auth/login; the
normal authenticated handler creates this user's synthetic demo workspace.
The fixture uses the same hashed credentials, session rotation, and workspace
permissions as registered users. Registration remains a separate verified
mail flow; no management endpoint is used to establish a session.