feat: implement and deploy blind_chess MVP

- pnpm workspace: shared/server/client packages
- Server: Fastify+ws, chess.js, FSM (touch-move + hierarchy),
  per-player view filter, zod validation, rate limiting, grace-window
  disconnect handling
- Client: Svelte 5 + Vite, click-to-move board, moderator panel,
  promotion/draw dialogs
- Shared: protocol types, ModeratorText enum, geometricMoves helper
  (provably zero opponent-info leak)
- 43 tests pass (21 shared, 22 server incl. 4 real-WS integration)
- Deploy: CT 690 on node-241 (192.168.0.245), systemd-managed,
  Caddy block for chess.sethpc.xyz
- Live at https://chess.sethpc.xyz

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/client/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "@blind-chess/client",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview",
+    "typecheck": "svelte-check --tsconfig ./tsconfig.json"
+  },
+  "dependencies": {
+    "@blind-chess/shared": "workspace:*"
+  },
+  "devDependencies": {
+    "@sveltejs/vite-plugin-svelte": "^5.0.0",
+    "svelte": "^5.0.0",
+    "svelte-check": "^4.1.0",
+    "typescript": "^5.6.0",
+    "vite": "^6.0.0"
+  }
+}