Add Colab benchmark + chat script for Qwen3-8B-AWQ

colab/README.md

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+Copy the full content of the script to Colab. Run in order:
+
+1. First cell: `!pip install torch transformers datasets accelerate autoawq huggingface_hub -q`
+2. Then run all remaining cells in order.
+
+The script benchmarks GSM8K (20 samples) and code generation (10 problems),
+then drops into an interactive chat loop with ARIA monitoring.
+
+Model: Qwen/Qwen3-8B-AWQ (same Qwen3-8B architecture as prism-ml/Ternary-Bonsai-8B)
+GPU: T4 (16GB VRAM) — fits comfortably with AWQ 4-bit quantization (~5.7GB)