docs(260618-smr): remove Redis references from documentation and e2e config

- CLAUDE.md: remove Redis constraint, ioredis library row, Redis architecture sentence, update compose comment
- README.md: remove Redis from prereqs, quick-start command, compose description, tech-stack live-sync row
- docs/ARCHITECTURE.md: delete Redis infrastructure table row
- docs/CONFIGURATION.md: remove Redis localhost:6379 mention from dev section
- docs/deployment.md: delete redis services table row
- docs/DEVELOPMENT.md: remove prereq mention, heading, two up commands, expose bullet, stack comment
- docs/GETTING-STARTED.md: prereq row, up command, prose mention
- docs/TESTING.md: 'API and MariaDB' (was API, MariaDB, and Redis)
- apps/pwa/e2e/README.md: delete Redis on :6379 bullet
- apps/pwa/playwright.config.ts: two comments updated (API+MariaDB, not API+MariaDB+Redis)

README.md

@@ -15,7 +15,7 @@ A self-hosted family organization hub for a two-person household. One color-code
 
 - Node.js 22 LTS
 - pnpm 11.5.1 (`corepack enable pnpm`)
-- Docker + Docker Compose (for MariaDB, Redis, and production deployment)
+- Docker + Docker Compose (for MariaDB and production deployment)
 
 ## Installation
 
@@ -53,7 +53,7 @@ Required environment variables (set in `.env` or your Docker host):
 
 ```bash
 # Start backing services
-docker compose -f docker-compose.yml -f docker-compose.dev.yml up mariadb redis
+docker compose -f docker-compose.yml -f docker-compose.dev.yml up mariadb
 
 # Run migrations
 pnpm --filter @familysync/api db:migrate
@@ -79,8 +79,8 @@ The API listens on port 3000. The PWA build is served separately (Vite `preview`
 apps/
   api/        Hono backend — CalDAV sync, OIDC auth, lists API, push notifications
   pwa/        React 19 PWA — calendar view, lists UI, service worker
-docker-compose.yml       Production services (API, MariaDB 11, Redis 7)
-docker-compose.dev.yml   Dev overrides (bind-mount src/, expose DB/Redis ports)
+docker-compose.yml       Production services (API, MariaDB 11)
+docker-compose.dev.yml   Dev overrides (bind-mount src/, expose DB ports)
 ```
 
 ## Commands
@@ -110,7 +110,7 @@ docker-compose.dev.yml   Dev overrides (bind-mount src/, expose DB/Redis ports)
 | Auth            | `@hono/oidc-auth` 1.8.3 — authorization code + PKCE against Authelia |
 | Calendar        | tsdav 2.2.2 (CalDAV) + ical.js 2.2.1 against Fastmail                |
 | Push            | web-push 3.6.7 (VAPID)                                               |
-| Live sync       | Server-Sent Events + Redis 7 pub/sub                                 |
+| Live sync       | Server-Sent Events (in-process EventEmitter)                         |
 | Frontend        | React 19, Vite 8, vite-plugin-pwa 1.3, TanStack Query 5, Zustand 5   |
 | Calendar UI     | Schedule-X 4.6                                                       |