fix(runtime): tokenize context compaction budget

pnpm-lock.yaml

@@ -32,6 +32,9 @@ importers:
       framer-motion:
         specifier: 12.36.0
         version: 12.36.0(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      js-tiktoken:
+        specifier: 1.0.21
+        version: 1.0.21
       react:
         specifier: 19.2.4
         version: 19.2.4
@@ -2944,6 +2947,9 @@ packages:
     resolution: {integrity: sha512-ekilCSN1jwRvIbgeg/57YFh8qQDNbwDb9xT/qu2DAHbFFZUicIl4ygVaAvzveMhMVr3LnpSKTNnwt8PoOfmKhQ==}
     hasBin: true
 
+  js-tiktoken@1.0.21:
+    resolution: {integrity: sha512-biOj/6M5qdgx5TKjDnFT1ymSpM5tbd3ylwDtrQvFQSu0Z7bBYko2dF+W/aUkXUPuk6IVpRxk/3Q2sHOzGlS36g==}
+
   js-tokens@4.0.0:
     resolution: {integrity: sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==}
 
@@ -7998,6 +8004,10 @@ snapshots:
 
   jiti@2.6.1: {}
 
+  js-tiktoken@1.0.21:
+    dependencies:
+      base64-js: 1.5.1
+
   js-tokens@4.0.0: {}
 
   js-yaml@4.1.1: