Adds a "Customizing the run schedule" section (DIGEST_CRON_AM/PM env
vars, edit-and-recreate flow) and a "Multi-tenant: one instance per
teammate" section covering scripts/add-digest-user.sh end to end:
what it does, the per-user file layout on ana-docker, idempotent
schedule/password updates, and the teardown path.
Updated the stale "two editions per day" intro line to note the
schedule is now configurable.
vh
5876399352