Merge PR#8 moonshot stack into main

[Copilot]

PRs #7 and #8 were never merged to main despite containing the complete moonshot feature stack. This branch brings those changes forward via a clean linear fast-forward.

Changes vs main

• train_gpt_mlx_kl.py — Full moonshot stack (EngramLite, BackoffNgramMixer, ComplementaryTraining, SkipGramHash, SmearGate, XSA, GPTQ-lite, sliding-window eval, LoRA TTT); trimmed 1847→1493 lines; fixed orphaned clip_grad_tree (body existed, def statement missing — NameError at runtime when grad_clip_norm > 0)
• pg_novel_ideas.md — Added from brainstorm branch; covers 8 approaches to sub-1.10 BPB with ranked idea list and dead-idea evidence table
• CLAUDE.md — Fixed broken venv activation path (source ~/pg_env/bin/activate); added moonshot smoke test and full H100 run commands

Merge note

This branch is a clean 5-commit linear chain ahead of main (fast-forward eligible). PR base needs to be retargeted to main before merging, or merge directly:

git checkout main
git merge origin/copilot/merge-pr-8-into-main --no-edit
git push origin main

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[augmentcode]

🤖 Augment PR Summary

Summary: This PR is intended to fast-forward/merge the complete “moonshot” training stack (plus docs updates) that previously lived in PRs #7/#8.

Review note: GitHub currently shows 0 changed files vs the PR base branch, so there’s no diff to review/annotate until the PR is retargeted (e.g., to main) or recreated with the correct base.

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