Edge Feature Quantization [5/5]: User Guide

[jchmura-sc]

Summary

• Documents main-edge feature quantization with a complete preprocessing code example.
• Explains edge restrictions, reconstruction, and expected performance effects.
• Makes the configuration scope explicit: each node or edge type independently selects feature keys and bit width, or remains unquantized.

Stack

1. Edge Feature Quantization [1/5]: Metadata Proto #749 - metadata proto
2. Edge Feature Quantization [2/5]: Preprocessor #750 - preprocessor
3. Edge Feature Quantization [3/5]: Read and Partition #751 - read path and partitioning
4. Edge Feature Quantization [4/5]: Distributed Materialization #752 - distributed loading and materialization
5. User guide - this PR

Verification

• Markdown formatting passes.
• Pre-commit whitespace checks pass.
• The full documentation build is blocked in this clean worktree because the local build cannot locate the Torch CMake package.