docs: add nightly research doc and SEO gist for graph-cut memory compaction

Research README includes SOTA survey (SIGMOD 2025, arXiv:2602.08097,
arXiv:2502.12110, VLDB 2025, and 7 more verified citations), forward-looking
thesis, real benchmark results, practical/exotic applications, and production
failure modes.

Public gist (gist.md) structured as a technical blog article with full
benchmark tables, architecture diagram, usage guide, and optimization guide.

https://claude.ai/code/session_01Ug97LEuQiVd7EAZAFP1vRN

Author: claude