Event wizard: how people book (whole course / pick sessions), capacity
per session and per-option session mode. Session picker on the public
registration page, Manual registration and the kiosk; at the door points
to Manual registration. Register, tickets and My Events handle picked
sessions. Adds docs/ROADMAP-v2.md and docs/HANDOVER.md so work can carry
on from another machine, and a pick-sessions e2e test.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
