refactor: remove dead code and stale references (#2908)

- remove `export` from `LocalTarball` interface in `shared/agent-tarball.ts`
  — the type is only used internally as the return type of `downloadTarballLocally`;
  it was never imported from outside the module.

- remove `getTerminalWidth` re-export from `commands/index.ts`
  — `getTerminalWidth` is only called inside `commands/info.ts` itself;
  it was re-exported through the barrel but never imported from there by any consumer or test.

bump CLI version patch: 0.25.18 → 0.25.19

Co-authored-by: spawn-qa-bot <qa@openrouter.ai>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@openrouter/spawn",
-  "version": "0.25.18",
+  "version": "0.25.19",
   "type": "module",
   "bin": {
     "spawn": "cli.js"

packages/cli/src/commands/index.ts

@@ -17,7 +17,6 @@ export {
   cmdClouds,
   cmdMatrix,
   getMissingClouds,
-  getTerminalWidth,
 } from "./info.js";
 // interactive.ts — cmdInteractive, cmdAgentInteractive
 export { cmdAgentInteractive, cmdInteractive } from "./interactive.js";

packages/cli/src/shared/agent-tarball.ts

@@ -160,7 +160,7 @@ export async function tryTarballInstall(
 
 // ─── Parallel tarball: local download + SCP upload ──────────────────────────
 
-export interface LocalTarball {
+interface LocalTarball {
   localPath: string;
   cleanup: () => void;
 }