fix: remove unused version variable from vscode publish script

The script uses Script.version (CLI version) for GitHub release upload,
not the extension's package.json version. Removed the unused variable
to avoid confusion.

packages/kilo-vscode/script/publish.ts

@@ -4,10 +4,7 @@ import { join } from "node:path"
 import { existsSync } from "node:fs"
 import { Script } from "@opencode-ai/script"
 
-const packageJson = await Bun.file(join(import.meta.dir, "..", "package.json")).json()
-const version = packageJson.version
-
-console.log(`Publishing VSCode extension version: ${version}`)
+console.log(`Publishing VSCode extension for release: v${Script.version}`)
 
 const outDir = process.env.VSIX_DIR || join(import.meta.dir, "..", "out")
 console.log(`Using VSIX directory: ${outDir}`)