Give CPUs distinct personalities built on different poker libraries

Each CPU now thinks with one of four engines, each backed by a different
published library (pinned versions):

- montecarlo (@pokertools/evaluator): the existing balanced Monte Carlo
  equity player, moved to server/bots/montecarlo.js.
- calculator (poker-calculations): the library's decideAction over the
  table state; push/fold below 12BB via its jam breakeven equity.
  Skipped automatically if the native addon cannot load.
- range (poker-utils): tight player; preflop by hand-strength percentile,
  postflop equity vs an estimated opponent range, bluffs only when
  alpha/bluffEV say they pay.
- madehand (pokersolver): loose, sticky player that only looks at the
  made hand and draws.

server/ai.js assigns a mix of engines per table (makeStyles), falls back
to the Monte Carlo engine on errors, and legalizes every decision.
The engine and its parameters stay server-side; players cannot tell
which library a CPU uses. Tests cover every engine and the no-leak rule.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

package-lock.json

@@ -11,10 +11,13 @@
         "@pokertools/engine": "2.1.0",
         "@pokertools/evaluator": "2.1.0",
         "express": "^4.22.3",
+        "poker-calculations": "4.0.3",
+        "poker-utils": "14.0.1",
+        "pokersolver": "2.1.4",
         "socket.io": "^4.8.4"
       },
       "engines": {
-        "node": ">=18"
+        "node": ">=24"
       }
     },
     "node_modules/@pokertools/engine": {
@@ -674,6 +677,17 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/node-gyp-build": {
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+      "resolved": "https://registry.npmjs.org/node-gyp-build/-/node-gyp-build-4.8.4.tgz",
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+      "license": "MIT",
+      "bin": {
+        "node-gyp-build": "bin.js",
+        "node-gyp-build-optional": "optional.js",
+        "node-gyp-build-test": "build-test.js"
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+    },
     "node_modules/object-assign": {
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       "license": "MIT"
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+    "node_modules/poker-calculations": {
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+      "resolved": "https://registry.npmjs.org/poker-calculations/-/poker-calculations-4.0.3.tgz",
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+      "license": "ISC",
+      "dependencies": {
+        "node-gyp-build": "^4.8.4"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/poker-utils": {
+      "version": "14.0.1",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/pokersolver": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/pokersolver/-/pokersolver-2.1.4.tgz",
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+      "engines": [
+        "node >= 4.0.0"
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