[renato0307]

WorkerPools need to configure the existing worker actor limit, for example three resident actors per worker.

Closes #129.

Adds optional spec.maxActorsPerWorker and forwards it to --max-actors for gVisor and microVM workers. Omission preserves the worker default. Zero accepts no actors. Negative and out-of-range values fail validation.

Changing or removing the field rolls the workers through the existing drain process. The CRD, Helm CRD copy, deepcopy code, and API guide are updated.

Checks:

• New tests passed three times with race detection and shuffle.
• Both affected suites passed with race detection.
• Controller build, vet, Go lint, Kubernetes API lint, boilerplate, and CRD synchronization passed.
• Regression tests failed when flag forwarding was removed.
• An independent review found no actionable defects.

Full go test -race ./... failed only in two unchanged microVM child-process tests with unsupported operation on macOS. Live-worker e2e tests were not run.

I have used AI to implement the code but I reviewed the code myself.