feat: ε-greedy v1 as active policy; dwell-time reward inference; offline sim framework

- Promote egreedy-v1 to active serving policy (ADR-0007): /score/egreedy + /reward/egreedy
  replaces linucb-v1 endpoints after offline sim shows +10.7% mean reward (−0.548 vs −0.606)
- Replace explicit helpful/not_helpful feedback with dwell-time inferred reward (inferReward):
  dismiss=−1.0, snooze=+0.1, done<15s=−0.3, done 15s–2min=+1.0, done 2–10min=+0.6, done>10min=+0.3
- Add ml/serving ε-greedy endpoints: /score/egreedy, /reward/egreedy, /stats/egreedy/{user_id}
  with d=7 feature vector (base 5 + sin/cos day-of-week encoding)
- Add offline simulation framework (ml/experiments/sim): rule/LLM/claude-code judges,
  two-phase score+reward, synthetic personas, task generator; results stored in sim_runs/sim_events
- Add /admin/simulations page: start runs, live-poll status, reward curve SVG, action/persona tables
- Fix egreedy day_of_week training skew: reward endpoint now uses actual dow instead of hardcoded 0
- Fix runner.py proxy bypass: httpx.Client(trust_env=False) for localhost ML calls
- Add dwellMs to TipFeedbackEvent contract and bus.test.ts fixture
- Schema: sim_runs, sim_events tables; tip_feedback gains dwell_ms, reward_milli columns
- ADR-0006: admin console framework; ADR-0007: egreedy-v1 policy selection rationale

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/admin/package.json

@@ -0,0 +1,32 @@
+{
+  "name": "@oo/admin",
+  "version": "0.0.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev -p 3080",
+    "build": "next build",
+    "start": "next start -p 3080",
+    "lint": "next lint",
+    "type-check": "tsc --noEmit",
+    "clean": "rm -rf .next"
+  },
+  "dependencies": {
+    "@oo/shared-types": "workspace:*",
+    "@tremor/react": "^3.18.3",
+    "@tanstack/react-table": "^8.20.5",
+    "next": "^15.1.6",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
+    "recharts": "^2.15.3",
+    "marked": "^14.1.4"
+  },
+  "devDependencies": {
+    "@types/node": "^22.10.5",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
+    "tailwindcss": "^3.4.17",
+    "autoprefixer": "^10.4.20",
+    "postcss": "^8.5.1",
+    "typescript": "^5.7.3"
+  }
+}