gh issue create --repo openclaw/openclaw
--title "bug: AbortSignal.any() fails when signal is not instanceof AbortSignal"
--body "## Description

`combineAbortSignals()` in `src/agents/pi-tools.abort.ts` passes objects to `AbortSignal.any()` without verifying they are actual `AbortSignal` instances, causing runtime errors.

Error Message

```
The "signals[0]" argument must be an instance of AbortSignal. Received an instance of Object
```

Steps to Reproduce

1. Run OpenClaw from source on Node.js 22
2. Trigger any exec tool call
3. Error occurs at `AbortSignal.any([a as AbortSignal, b as AbortSignal])`

Root Cause

`src/agents/pi-tools.abort.ts:25-26` uses type assertion `as AbortSignal` but doesn't verify the actual runtime type before calling `AbortSignal.any()`.

Suggested Fix

Add `instanceof AbortSignal` check before calling `AbortSignal.any()`:

```typescript
if (
typeof AbortSignal.any === "function" &&
a instanceof AbortSignal &&
b instanceof AbortSignal
) {
return AbortSignal.any([a, b]);
}
```

Environment

• Node.js: 22.22.0
• OpenClaw: 2026.2.1 (main branch)
• OS: macOS 14.7.3"