fix: drain piped stderr in CLI installers and uploadFile to prevent deadlock (#1922)

PR #1920 fixed pipe buffer deadlock in runServerCapture and
waitForCloudInit but missed 6 other locations where Bun.spawn uses
"pipe" for stderr without draining it before await proc.exited.

When a child process writes >64KB to a piped stderr, the OS pipe
buffer fills, the child blocks on write(), and the parent blocks on
exited — classic deadlock.

Fix: change stderr from "pipe" to "inherit" in all 6 locations since
the stderr output is never read programmatically. This also lets
users see installation errors and SCP errors in real time.

Affected functions:
- fly.ts ensureFlyCli()
- sprite.ts ensureSpriteCli()
- gcp.ts ensureGcloudCli()
- hetzner.ts uploadFile()
- digitalocean.ts uploadFile()
- aws.ts uploadFile()

-- refactor/code-health

Agent: code-health

Co-authored-by: B <6723574+louisgv@users.noreply.github.com>
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

packages/cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@openrouter/spawn",
-  "version": "0.10.10",
+  "version": "0.10.11",
   "type": "module",
   "bin": {
     "spawn": "cli.js"

packages/cli/src/aws/aws.ts

@@ -1091,8 +1091,8 @@ export async function uploadFile(localPath: string, remotePath: string): Promise
     {
       stdio: [
         "ignore",
-        "ignore",
-        "pipe",
+        "inherit",
+        "inherit",
       ],
     },
   );

packages/cli/src/digitalocean/digitalocean.ts

@@ -1053,8 +1053,8 @@ export async function uploadFile(localPath: string, remotePath: string, ip?: str
     {
       stdio: [
         "ignore",
-        "ignore",
-        "pipe",
+        "inherit",
+        "inherit",
       ],
     },
   );

packages/cli/src/fly/fly.ts

@@ -325,8 +325,8 @@ export async function ensureFlyCli(): Promise<void> {
     {
       stdio: [
         "ignore",
-        "ignore",
-        "pipe",
+        "inherit",
+        "inherit",
       ],
     },
   );

packages/cli/src/gcp/gcp.ts

@@ -352,7 +352,7 @@ export async function ensureGcloudCli(): Promise<void> {
       stdio: [
         "ignore",
         "inherit",
-        "pipe",
+        "inherit",
       ],
     },
   );

packages/cli/src/hetzner/hetzner.ts

@@ -619,8 +619,8 @@ export async function uploadFile(localPath: string, remotePath: string, ip?: str
     {
       stdio: [
         "ignore",
-        "ignore",
-        "pipe",
+        "inherit",
+        "inherit",
       ],
     },
   );

packages/cli/src/sprite/sprite.ts

@@ -153,7 +153,7 @@ export async function ensureSpriteCli(): Promise<void> {
       stdio: [
         "ignore",
         "inherit",
-        "pipe",
+        "inherit",
       ],
     },
   );