feat(p7): ai-studio demo + smoke-ai; P7 verification green

Task 7.6: apps/ai-studio (Vite, port 5177) — ingest a message, run CLASSIFY/
SUMMARIZE/EXTRACT, see proposal cards with confidence, evidence citations,
abstention, model/cost + a budget meter, and accept/reject; built on the ai-web
SDK via AiProvider. scripts/smoke-ai.mjs proves the P7 guarantees end to end:
auto-CLASSIFY → AI flag → routing REVIEW/DENY never ALLOW (KG-05), summary cites
evidence, EXTRACT stays DISCUSSION (Scenario 7), replay-once, accept.

P7 verification: 79 tests green (3x stable), pnpm -r build all packages+demos,
boundary passes and fails on ai-web->service, smoke-ai PASS, prior smokes
(realtime/inbox/support/adapter/route) PASS.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/ai-studio/tsconfig.json

@@ -0,0 +1,12 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "lib": ["ES2022", "DOM"],
+    "jsx": "react-jsx",
+    "types": ["react", "react-dom"],
+    "noEmit": true
+  },
+  "include": ["src/**/*.ts", "src/**/*.tsx"]
+}