Add resource gates to control queue eligibility by resource availability#203
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Introduces ResourceGate, an abstract base class that controls whether queues should be dequeued based on external resource availability (GPU utilization, CPU load, network bandwidth, etc.). The base class handles TTL-based caching of check results; subclasses implement #check. Built-in gates: - OpenGate: always allows (default) - ThresholdGate: samples a metric via callback, blocks when >= threshold Gates are configured per-queue on QueueList via resource_gates hash. The QueueList#queues method filters out gated queues on every access, so dequeue adapters always see current resource state. Multiple queues can share a gate instance to represent a shared resource boundary. https://claude.ai/code/session_01PG9VitHQLVVWAJmMtFvQcA
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Introduces a resource-aware gating system that allows queues to be excluded from dequeuing when external resources (GPU, CPU, network, etc.) are constrained. This enables the job scheduler to respect system resource pressure and avoid overloading specific resources.
fixes #169