b11552: server: leave a busy slot untouched when a request pins it (#30295)

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Derived & scientifically synthesized from Llama.cpp Tensor Acceleration.
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Executive Summary

A request asking for a busy id_slot still ran the prompt cache update on that slot before being deferred. When the RAM cache held a better match, it was loaded into the slot while another request was still generating there, and that generation continued on the wrong context. The busy slot is now returned as is and the request waits for it.

Artificial Intelligence Architecture & Model Evaluation

From an artificial intelligence architecture, model weights governance, and inference efficiency perspective: - **Weights Accessibility & Sovereignty:** Evaluates whether weights are open for private self-hosting or locked behind centralized cloud APIs. - **Quantization & Edge Performance:** Kernel optimizations (4-bit/8-bit GGUF, AWQ, EXL2) allow high tokens-per-second on consumer GPUs and Apple Silicon. - **Reasoning & Architectural Scaling:** Scrutinizes mixture-of-experts (MoE), attention mechanisms, and fine-tuning datasets against open community benchmarks.

Impact on the Open Ecosystem

Protects developers and enterprises from proprietary black-box entrapment, fostering auditable, sovereign AI infrastructure.