Add Looped Transformer Design non-record submission (non tuned)

[Aum08Desai]

Adds a notable non-record 10-minute submission under records/track_non_record_16mb/.

Summary:

• PR315-derived looped transformer with a shared recurrent core
• Partial RoPE, LN scaling, late QAT, XSA4, and bigram features
• Under the 16,000,000 byte artifact cap
• final_int6_sliding_window_exact val_bpb = 1.14620421

Notes:

• This run is far from optimized.
• It is being submitted mainly as an architectural reference point for recurrent-depth / looped-transformer design under the Parameter Golf constraints.
• There is still clear room for sweeps on loop geometry, shared-vs-untied allocation, attention cadence, optimizer settings, and batch/schedule choices.
• If anyone wants to push this direction further, I would strongly encourage running proper sweeps on top of this baseline rather than treating this result as tuned.