Replace Thread.sleep with async sleep in DaemonLauncher.killExistingDaemon

[2witstudios]

Context

DaemonLifecycle.swift — DaemonLauncher.killExistingDaemon() (lines 78-105) uses Thread.sleep(forTimeInterval: 0.1) in a polling loop (up to 20 iterations = 2 seconds) to wait for a daemon process to die after SIGTERM.

Problem

Thread.sleep blocks the actor's executor thread, preventing any other work from running on the DaemonLauncher actor during that time. Since killExistingDaemon is called from async methods (ensureDaemon, restartDaemon), it should use cooperative async sleeping.

Proposal

Make killExistingDaemon() async and replace Thread.sleep with try await Task.sleep:

private func killExistingDaemon() async {
    // ...
    kill(pid, SIGTERM)
    
    for _ in 0..<20 {
        try? await Task.sleep(nanoseconds: 100_000_000)
        if kill(pid, 0) != 0 { break }
    }
    // ...
}

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