P1 complete: web front, test suite, CI — acceptance ALL GREEN

Fan-out integration + fixes found by the test/acceptance pass:
- FIX ring-buffer: chunks >= capacity skipped bytes now count into the
  monotonic offset (invariant: stream byte k lives at k % capacity) —
  window order was corrupted on unaligned big chunks
- FIX auth: non-numeric cookie expiry no longer bypasses expiration
- FIX protocol: safe-integer validation on ack.bytes / hello.protocol
- FIX @fastify/websocket v11: websocket route must be registered in an
  encapsulated context after plugin load (handler got REST signature)
- FIX flow-control deadlock found by e2e acceptance: client only ACKs
  on data receipt, so pausing with an unACKed residue in (LOW,
  ACK_EVERY] stalled both sides at 0.9 MB. ACK_EVERY now 64 KiB (<=
  LOW invariant, tested) + trailing debounced ACK in the web client
- Web: Vue 3 + Vite + Pinia + Tailwind 4 + vue-i18n (EN/FR) + xterm 6
  (fit + webgl fallback), multiplexed ws-client with reconnect/backoff
  and resync epochs
- Tests: 100 vitest (protocol fuzz, ring edges, auth, pty-manager flow
  control with mocked pty, REST e2e) ; CI Node 22/24 + pack-smoke
- scripts/acceptance-p1.mjs: real daemon + real WS client — boot,
  login, attach, stdin, 10 MB flood w/ ACK (13.7 MB/1.9s, RSS bounded),
  brutal disconnect + replay resync, kill broadcast, SIGTERM drain

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/web/package.json

@@ -0,0 +1,29 @@
+{
+  "name": "@arboretum/web",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vue-tsc --noEmit && vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@arboretum/shared": "*",
+    "@xterm/addon-fit": "^0.11.0",
+    "@xterm/addon-webgl": "^0.19.0",
+    "@xterm/xterm": "^6.0.0",
+    "pinia": "^3.0.4",
+    "vue": "^3.5.38",
+    "vue-i18n": "^11.4.5",
+    "vue-router": "^4.6.4"
+  },
+  "devDependencies": {
+    "@tailwindcss/vite": "^4.3.0",
+    "@vitejs/plugin-vue": "^6.0.7",
+    "tailwindcss": "^4.3.0",
+    "typescript": "^5.7.0",
+    "vite": "^8.0.16",
+    "vue-tsc": "^3.3.4"
+  }
+}