Add TurboQuant 3-bit + HQQ mixed-precision compression pipeline (sections 9-11)

Rewrite from scratch — exact copy of official unsloth Qwen2.5-7B notebook pattern with pinned deps

Speed fix v3: seq 1024, bs 4, max_steps=800, max_length param, LoRA r=16 — target ~2h on T4

Speed fix: packing=True, seq 2048, bs 2, 1 epoch — estimated ~2h on T4 instead of 177h

Fix: train_on_responses_only needs explicit Qwen2.5 ChatML parts + warmup_ratio→warmup_steps + total_mem→total_memory

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