fix: run bun install before building CLI binary in prepare-cli-binary

The prepare-cli-binary script would fail when opencode dependencies
weren't installed, because bunfig.toml requires @opentui/solid/preload.
Adding a bun install step before the build ensures deps are available.

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

@@ -78,6 +78,14 @@ function ensureBuiltBinary() {
     )
   }
 
+  // Ensure dependencies are installed before building.
+  log("Installing dependencies in opencode package...")
+  execSync("bun install", {
+    cwd: opencodeDir,
+    stdio: "inherit",
+    env: process.env,
+  })
+
   // Build using the opencode package script.
   execSync("bun run build --single", {
     cwd: opencodeDir,