Update documentation for recent changes

- README.md: add reminder_10_enabled and reminder_5_enabled config keys
- CLAUDE.md: note reminder toggle keys in config sheet description
- tests/CLAUDE.md: add cli.checkin.test.js to test file list
- apps-script/CLAUDE.md: update checkInReservation() entry to reflect bug fix

Author: nmayalais

CLAUDE.md

@@ -36,7 +36,7 @@ Six logical "sheets" (Google Sheets in prod, JSON locally):
 - **chargers** — config + active session reference
 - **sessions** — active/completed charging sessions
 - **reservations** — bookings with check-in and no-show data. `released_early` (bool) is stamped `true` when a checked-in session ends before the halfway point of the reservation window, preserving the user's net-new status and daily allotment.
-- **config** — key/value settings (grace periods, limits, etc.). Notable keys: `reservation_open_hour` supports `"H:MM"` format (e.g. `"5:45"`), `walkup_net_new_window_minutes` controls Option A priority window.
+- **config** — key/value settings (grace periods, limits, etc.). Notable keys: `reservation_open_hour` supports `"H:MM"` format (e.g. `"5:45"`), `walkup_net_new_window_minutes` controls Option A priority window, `reminder_10_enabled` / `reminder_5_enabled` toggle the 10- and 5-minute session-end warnings (both default off).
 - **strikes** — per-user no-show strike records
 - **suspensions** — temporary bans from strike threshold
 

README.md

@@ -125,6 +125,8 @@ Key/value settings (strings). Common keys:
 - `reservation_open_minute`: earliest local minute for same-day booking.
 - `walkup_net_new_window_minutes`: walk-up priority window for net-new users after a slot opens.
 - `walkup_returning_window_minutes`: additional walk-up window for returning users before full open access.
+- `reminder_10_enabled`: set to `true` to enable the 10-minute session-end warning (default off).
+- `reminder_5_enabled`: set to `true` to enable the 5-minute session-end warning (default off).
 
 ## Reservation rules
 - Same-day only.

apps-script/CLAUDE.md

@@ -24,7 +24,7 @@ Production Google Apps Script code. No build step — files are deployed directl
 - `isReturningUser_(userEmail, sessions, reservations, now)` — returns true if the user charged or made a qualifying reservation today. Early-released sessions/reservations do not count.
 - `completeReservationForSession_(session, now)` — called on session end; stamps `released_early: true` on the reservation if `now` is before the reservation's halfway point (using the original planned `end_time` before it is overwritten).
 - `getReservationConfig_(config)` — parses all reservation settings. Supports `"H:MM"` format in `reservation_open_hour` (e.g. `"5:45"` correctly sets 5:45 AM).
-- `checkInReservation()` — early-check-in window uses `earlyStartMinutes` only (not the old `Math.max` conflation with `checkinEarlyMinutes`).
+- `checkInReservation()` — always delegates session creation to `startSessionForReservation_()` for both early and on-time check-ins. This ensures admin check-ins and reservation-owner check-ins bypass walk-up tier rules correctly. Previously the on-time path called `startSession()` which re-evaluated walk-up rules against the caller's email, breaking admin check-ins.
 - `validateReservation_()` — per-day check runs before upcoming-count check so users get the clearer error message first.
 
 ## Frontend patterns

tests/CLAUDE.md

@@ -7,6 +7,7 @@ Jest test suite targeting `cli/engine.js` (business logic) and `apps-script/scri
 - **cli.policy.test.js** — reservation limits (max upcoming, per-day), no-show strikes, suspensions, early-start rules, prior reservation protection, early/late session-release halfway rule.
 - **cli.admin.test.js** — admin force-end sessions, reset charger.
 - **cli.reservation-session.test.js** — check-in lifecycle, session auto-start on check-in, matching reservations to sessions.
+- **cli.checkin.test.js** — comprehensive check-in coverage: on-time and early happy paths, timing boundaries, authorization (user/admin/case-insensitive), reservation state guards, active session conflict, suspension, early-start error cases (charger busy, previous reservation grace window), double check-in, return value.
 - **ui.test.js** — DOM rendering via jsdom, board data display, action handler behavior, and new mobile-UI features.
 
 ## Running tests