docs/api/system.md

@@ -1,9 +1,9 @@
 ---
 type: api
 title: System Endpoints
-description: Bootstrap payload, public event status, public/authenticated SSE streams, and public event-window timestamps.
-tags: [api, system, bootstrap, event, sse, settings]
-timestamp: 2026-07-22T13:40:00Z
+description: Bootstrap payload, public event status, public/authenticated SSE streams, and public event-window timestamps; the public `event/stream` also forwards `general` topic frames carrying `registrationsEnabled`.
+tags: [api, system, bootstrap, event, sse, settings, registrations]
+timestamp: 2026-07-22T16:15:00Z
 ---
 
 # Endpoints
@@ -130,6 +130,14 @@ Public, flattened event stream that emits the legacy payload shape
 1-second tick and on hub pushes. Preserved for backward compatibility
 with the original landing page status badge.
 
+`admin/general` updates are also broadcast on this stream as
+`{ topic: 'general', themeKey, registrationsEnabled }` so the public
+landing page can refresh its cached bootstrap whenever an admin toggles
+the registrations flag (or any other general setting) without forcing
+the user to hard-refresh. The frame is interleaved with the legacy
+event-status frames. The legacy event-status frames are still emitted
+on the 1-second tick so existing consumers are unaffected.
+
 # `GET /api/v1/scoreboard/stream`
 
 Public SSE stream that pushes a flattened solve payload whenever a new

docs/architecture/key-files.md

@@ -1,9 +1,9 @@
 ---
 type: architecture
 title: Key Files Index
-description: One-line responsibility for important source and contract-test files, including strict event-window validation.
-tags: [architecture, key-files, event-window, validation, default-challenge-ip]
-timestamp: 2026-07-22T15:46:18Z
+description: One-line responsibility for important source and contract-test files, including strict event-window validation and the public bootstrap SSE listener.
+tags: [architecture, key-files, event-window, validation, default-challenge-ip, sse, bootstrap]
+timestamp: 2026-07-22T16:15:00Z
 ---
 
 # Backend
@@ -42,6 +42,8 @@ timestamp: 2026-07-22T15:46:18Z
 | `frontend/src/app/core/services/auth.service.ts` | Signal-backed access token and current-user state; owns the cross-tab invalidation `BroadcastChannel` + `storage`-event fallback. |
 | `frontend/src/app/core/services/auth-session-events.pure.ts` | Pure cross-tab message encoding/validation and namespaced constants used by the auth broadcast channel. |
 | `frontend/src/app/core/services/authenticated-event-source.service.ts` | Fetch-based authenticated SSE transport with frame parsing, abort support, and a separate `'unauthorized'` event for `401`/`403`. |
+| `frontend/src/app/core/services/bootstrap-event.service.ts` | Root-provided public SSE listener that subscribes to `/api/v1/event/stream`, filters `topic === 'general'` frames, and triggers `BootstrapService.refresh()` so the landing modal stays in sync with admin general-settings updates. |
+| `frontend/src/app/core/services/bootstrap-event.pure.ts` | Pure helpers for the public bootstrap SSE listener: `isBootstrapGeneralFrame` predicate, SSE line parser, and the `makeBootstrapEventSource` factory (fetch + `ReadableStream` opener with frame buffering and idempotent `close()`). |
 | `frontend/src/app/core/services/event-status.store.ts` | Event state signal store, one-second countdown timer, and the optional `onUnauthorized` callback wiring. |
 | `frontend/src/app/core/services/event-status.pure.ts` | Event payload types, transport interface (including `'unauthorized'` listener), pure countdown helpers, and the `LED_COLOR_BY_STATE` map used by the shell LED. |
 | `frontend/src/app/features/home/home.component.ts` | Authenticated shell container; starts user and event state services, subscribes to peer invalidation, and navigates to `/login` when the session is invalidated elsewhere. |

docs/guides/landing-page.md

@@ -1,9 +1,9 @@
 ---
 type: guide
 title: Landing Page
-description: How the public landing page renders, how the login + registration modal is opened, and what each form does.
-tags: [guide, landing, login, register, ui]
-timestamp: 2026-07-21T18:45:54Z
+description: How the public landing page renders, how the login + registration modal is opened, what each form does, and how the modal stays in sync with admin `registrationsEnabled` changes via SSE.
+tags: [guide, landing, login, register, ui, sse, bootstrap]
+timestamp: 2026-07-22T16:15:00Z
 ---
 
 # What you see
@@ -90,6 +90,31 @@ The modal is dismissible via the **×** button (`landing-modal-close`),
 clicking the overlay backdrop, or pressing `Escape`. Submit-in-flight
 dismissal is suppressed.
 
+# Reacting to admin changes
+
+The Login/Register modal reflects the value of
+`bootstrap.payload().registrationsEnabled`, which is loaded once at app
+boot by `BootstrapService.load()`. Two paths keep the modal consistent
+with the API:
+
+1. `LandingComponent.ngOnInit()` calls `BootstrapService.refresh()` so
+   the public landing page always fetches the latest bootstrap payload
+   before rendering the modal. This covers users who reach `/login`
+   via a hard refresh or fresh tab and have not previously subscribed to
+   the SSE channel.
+2. `BootstrapEventService` (started by `AppComponent.ngOnInit`) opens
+   the public `GET /api/v1/event/stream` SSE channel and listens for
+   `{ topic: 'general' }` frames. Whenever the admin saves a setting via
+   `PUT /api/v1/admin/general/settings`, the backend emits a `general`
+   hub event with `themeKey` and `registrationsEnabled`; the public SSE
+   forwards it on `/api/v1/event/stream` and the SPA calls
+   `BootstrapService.refresh()` to re-apply the new flag (and theme).
+
+The pure helper `landingModalShowsRegister(registrationsEnabled)` in
+`frontend/src/app/features/landing/login-modal.service.ts` mirrors the
+HTML predicate and is asserted in
+`tests/frontend/landing-modal.spec.ts`.
+
 # Server error code → user copy
 
 `buildLoginFailureMessage` (`frontend/src/app/features/landing/login-modal.service.ts`)

docs/index.md

@@ -11,7 +11,7 @@ scoreboard, an event window with a public countdown, theming, and admin
 controls.
 
 The docs below are organized by purpose so agents can pull just the slice
-they need. Last regenerated 2026-07-22T15:46:18Z.
+they need. Last regenerated 2026-07-22T16:15:00Z.
 
 # Architecture