Fix: add watchdog timer to unblock Gemini when OpenClaw tool call stalls

[kbaker827]

Problem

When Gemini delegates a task that involves a slow OpenClaw skill (web search, sending a message to an external service, etc.), the conversation freezes. The UI shows Running: execute... and Gemini never speaks again. The underlying cause is that there is no per-call deadline — the conversation just waits for the 120s URLSession hard timeout, which is far too long for a voice interaction.

Fixes #12

Solution

Race the delegateTask call against a 60-second watchdog inside withTaskGroup. The first child to finish wins, the other is cancelled immediately:

let result = await withTaskGroup(of: ToolResult.self) { group in
    group.addTask { await bridge.delegateTask(...) }
    group.addTask {
        try? await Task.sleep(nanoseconds: 60 * 1_000_000_000)
        return .failure("The gateway did not respond within 60 seconds. ...")
    }
    let first = await group.next()!
    group.cancelAll()
    return first
}

If the gateway responds in time, the watchdog task is cancelled and no behaviour changes. If the gateway stalls, Gemini receives a clear failure message after 60 seconds and can speak an apology, keeping the conversation alive.

Test plan

• Configure OpenClaw and ask Gemini to search the web while OpenClaw is intentionally slow/unreachable
• Confirm the UI transitions from "Running: execute..." to "Failed: execute" within ~60 seconds
• Confirm Gemini speaks a timeout apology rather than hanging
• Confirm fast tool calls (< 60s) are unaffected

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