How I Run Local LLMs for Coding (and Why the Quant Matters)

How I run a coding LLM locally on a single RTX 3090 Ti — the model journey from Claude-distilled to a dense 27B coder, why MoE beat dense for speed, why I stayed on llama.cpp over vLLM on Ampere, and the quant type and sampler flag that quietly bit me.