Updated docs.

docs/USAGE.md

@@ -16,7 +16,7 @@ After logging in, create accounts for your team under **Users**. Each user gets
 | **ticketing** | Participants, Tickets, Import | Manage participants and tickets, run CSV imports |
 | **staffing** | Dashboard, Schedule, Volunteers, Departments | Manage volunteers, departments, and shifts across all departments. No user management or settings |
 | **colead** | Dashboard, Schedule, Volunteers | Manage volunteers and shifts within their assigned department(s) only |
-| **gatekeeper** | Full-screen Gate UI | Check in ticket holders (search + QR scan). No access to other pages |
+| **gatekeeper** | Full-screen Gate Kiosk | Check in ticket holders (search + QR scan). No access to other pages |
 
 Coleads are scoped to one or more departments. When creating a colead user, assign their department(s).
 
@@ -95,7 +95,15 @@ Under **Volunteers**, you can:
 - Create volunteers manually (name, email, department)
 - Assign volunteers to departments
 - Mark volunteers as co-leads
-- Check in volunteers
+- Mark volunteers as ready (briefed at the volunteer station)
+
+### Volunteer statuses
+
+| Status | Meaning |
+|--------|---------|
+| **Unconfirmed** | Signed up but hasn't confirmed their email |
+| **Confirmed** | Email confirmed, not yet briefed |
+| **Ready** | Briefed at the volunteer station, has what they need to report for shifts |
 
 Volunteers are separate from participants. A person can be both a ticket holder and a volunteer. When a volunteer signs up via the public form, they are automatically linked to their participant record by email.
 
@@ -117,7 +125,7 @@ Shifts can be reordered within a department to reflect priority or sequence usin
 
 ## Volunteer Kiosk
 
-The kiosk lets volunteers self-select shifts without logging in.
+The Volunteer Kiosk is the public-facing flow for volunteers: signup, email confirmation, and shift self-scheduling. The shift scheduling page lets volunteers self-select shifts without logging in.
 
 ### Setup
 
@@ -145,15 +153,16 @@ No login is required. The kiosk code authenticates the request.
 
 Kiosk codes use the character set `A-Z, 2-9` (excluding 0/O, 1/I/L to avoid ambiguity when reading aloud or on printed badges).
 
-## Gate Check-In
+## Gate Kiosk
 
-Users with the **gatekeeper** role see a dedicated full-screen UI:
+Users with the **gatekeeper** role see a dedicated full-screen Gate Kiosk:
 
 - **QR scanner** — uses the device camera via the BarcodeDetector API. Scanned codes populate the search field.
 - **Search** — type a name to filter tickets in real-time (searches local IndexedDB, works offline).
-- **Volunteer dual check-in** — if a ticket holder is also a volunteer, the gate UI shows their volunteer status and offers to check in both simultaneously.
 - **Recent check-ins** — the last 10 check-ins are shown for quick reference.
 
+Admins and ticketing leads can also check in tickets directly from the **Participants** page by expanding a participant's tickets.
+
 Gate devices should install Turnpike as a PWA (Add to Home Screen) for the best experience. Check-ins are stored locally and sync when connectivity is available.
 
 ## Schedule