refactor(ai): upgrade pi runtime and define execution semantics

packages/mcp-server/README.md

@@ -68,7 +68,7 @@ The server registers ChatLab tools for:
 
 ## Requirements
 
-- Node.js 20 or later
+- Node.js 22.19 or later
 - Existing ChatLab data under `~/.chatlab/`
 
 `better-sqlite3` is installed as a runtime dependency. On platforms without a matching prebuilt binary, npm may need local build tools for native modules.

packages/mcp-server/package.json

@@ -12,7 +12,7 @@
     "dist/"
   ],
   "engines": {
-    "node": ">=20"
+    "node": ">=22.19.0"
   },
   "publishConfig": {
     "access": "public"

packages/mcp-server/tsup.config.ts

@@ -15,7 +15,7 @@ export default defineConfig({
   splitting: true,
   sourcemap: true,
   clean: true,
-  target: 'node20',
+  target: 'node22',
   platform: 'node',
   define: {
     __MCP_PACKAGE_VERSION__: JSON.stringify(pkg.version),