feat(kilo-vscode): add pnpm update-backend command

Adds --force flag to prepare-cli-binary.mjs and a new 'update-backend'
pnpm script that rebuilds the CLI binary even when it already exists.

packages/kilo-vscode/package.json

@@ -262,7 +262,8 @@
     "format": "prettier --write .",
     "format:check": "prettier --check .",
     "lint": "eslint src",
-    "test": "vscode-test"
+    "test": "vscode-test",
+    "update-backend": "node scripts/prepare-cli-binary.mjs --force"
   },
   "devDependencies": {
     "@types/diff": "^6.0.0",

packages/kilo-vscode/scripts/prepare-cli-binary.mjs

@@ -1,8 +1,10 @@
-import { existsSync, mkdirSync, readdirSync, statSync, copyFileSync, chmodSync } from "node:fs"
+import { existsSync, mkdirSync, readdirSync, statSync, copyFileSync, chmodSync, rmSync } from "node:fs"
 import path from "node:path"
 import { fileURLToPath } from "node:url"
 import { execSync } from "node:child_process"
 
+const forceRebuild = process.argv.includes("--force")
+
 /**
  * Ensures the VS Code extension has a CLI binary at `packages/kilo-vscode/bin/kilo`.
  *
@@ -103,14 +105,25 @@ function ensureBuiltBinary() {
 }
 
 function main() {
-  if (existsSync(targetBinPath)) {
+  if (existsSync(targetBinPath) && !forceRebuild) {
     const st = statSync(targetBinPath)
     log(
-      `CLI binary already present at ${path.relative(kiloVscodeDir, targetBinPath)} (${Math.round(st.size / 1024 / 1024)}MB).`,
+      `CLI binary already present at ${path.relative(kiloVscodeDir, targetBinPath)} (${Math.round(st.size / 1024 / 1024)}MB). Use --force to rebuild.`,
     )
     return
   }
 
+  if (existsSync(targetBinPath) && forceRebuild) {
+    log(`Removing existing binary (--force).`)
+    rmSync(targetBinPath)
+    // Also remove the prebuilt dist so ensureBuiltBinary() triggers a fresh build
+    const distDir = path.resolve(opencodeDir, "dist")
+    if (existsSync(distDir)) {
+      rmSync(distDir, { recursive: true })
+      log(`Removed ${path.relative(kiloVscodeDir, distDir)} to force rebuild.`)
+    }
+  }
+
   if (!existsSync(opencodeDir)) {
     throw new Error(`Expected opencode package at ${opencodeDir}, but it does not exist.`)
   }