Accepts summary, projects_worked_on,
tasks_completed, decisions_made and raw_notes.
The sessions table has no decisions column, so decisions_made is folded
into raw_notes under a Decisions heading.
Get one by running node tools/generate-session.js in the brett-brain repo.
Monday to Friday a code lasts until 5pm, otherwise one hour. Stored in this
browser only, and dropped when it expires.