fix: prevent stuck power lock when restarting an offline server (k8s)

[devin-ai-integration]

Summary

Restarting (or stopping) an offline server on the Kubernetes environment left the panel stuck with another power action is currently being processed for this server. The power lock was held for ~10 minutes per attempt, so every subsequent action returned ErrLockerLocked.

Root cause: a stopped server's Pod still exists but in a non-running (Succeeded/Failed) phase — a completed Pod is not auto-removed. On restart, HandlePowerAction acquires the power lock and calls WaitForStop:

• WaitForStop → Stop → (signal-stop eggs) → Terminate(SIGTERM), which sees the Pod isn't running and returns without deleting it.
• WaitForStop then calls waitForPodDeletion, which blocks for the full duration (10 min) waiting for a deletion that never happens — holding the power lock the whole time.

Fix: short-circuit WaitForStop when the Pod is already gone or not running — the server is effectively stopped, so mark it offline and return immediately. A subsequent Start still recreates the Pod via OnBeforeStart, so no stale-Pod cleanup is lost.

func (e *Environment) WaitForStop(ctx, duration, terminate) error {
    if pod, err := e.getPod(ctx); err != nil {
        if isNotFound(err) { e.markOffline(); return nil }   // already gone
    } else if !isPodRunning(pod) {
        e.markOffline(); return nil                          // exists but stopped
    }
    // ... existing stop + waitForPodDeletion flow (only when actually running)
}

Also extracted the repeated stopping → offline transition into a markOffline() helper (reused in Terminate).

Tests

Added TestWaitForStop covering restart-while-offline. The "Pod exists but not running" case blocks for the full timeout without the fix and returns immediately with it. go build ./..., go vet ./environment/kubernetes/..., and go test ./... all pass.

Link to Devin session: https://app.devin.ai/sessions/c6e2874ef8924e68a929e491c2018270
Requested by: @Exonical

[devin-ai-integration]

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