exp: post-quant AdamW TTT smoke on openai#1019 base

- copy the old openai#1019 execution path into the experiment branch
- add score-first AdamW TTT on the dequantized int6 eval model
- default TTT on with 1 epoch for the narrow smoke path
- instrument ar_selfgen_gptq/final_eval/post_quant_ttt timing

Author: resouer