default controllers[].logLevel to prevent empty -v= crashloop (chart 0.3.1)

[bborbe]

Robustness fix found during the quant crossover: a controllers: entry that omits logLevel rendered - -v= (empty), which glog rejects at startup → the controller CrashLoopBackOff'd printing its usage. Defaulting it to "2" (matching the executor's existing default) makes the chart safe for any consumer who omits it.

• controller-statefulset.yaml: -v={{ $c.logLevel }} → -v={{ $c.logLevel | default "2" }}
• Chart 0.3.0 → 0.3.1

Verified

helm template with a controller entry that omits logLevel now renders args: ['-v=2']; lint clean; make precommit passes.

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