Base: yinita/ps4mas-sft-x5-single-ep3
Judge: Claude Sonnet 4.6 (Bedrock)
Reward: phase2-only (acq_w=3, comp_w=20), reward_phase1_steps=0
sync-every=2, force_acquire_frac=0, max_steps=50
Topology curriculum: 1–10 single → 11–20 central → 21–30 hier → 31–40 debate → 41–50 single
WandB (resume to 50): https://wandb.ai/yinita/PS4MAS_GiGPO/runs/lfy5y4qc

Case study @ this checkpoint (n=10, Sonnet)

Series

repo	step	topo	CS composite	CS acq
`yinita/gigpo-multi-topo-sync2-w3c20-0729-single-step10`	10	single	2.666	0.10
`yinita/gigpo-multi-topo-sync2-w3c20-0729-central-step20`	20	central	2.498	0.70
`yinita/gigpo-multi-topo-sync2-w3c20-0729-hier-step30`	30	hier	3.100	0.70
`yinita/gigpo-multi-topo-sync2-w3c20-0729-debate-step40`	40	debate	2.666	0.60
`yinita/gigpo-multi-topo-sync2-w3c20-0729-single-step50`	50	single	2.566	0.30

Adapter-only (no optimizer). Load as LoRA on the SFT base (e.g. vLLM --enable-lora).