[ronaldtse]

What

Final verdicts for the two recipe arms (full-set windowed, teacher 2.2890 reproduced, labels e70ce991, paired between-students bootstrap):

• 03 headwise Muon: NEGATIVE, separated. 4.8164 vs 4.5701; Δ +0.2267pp, CI95 [+0.016, +0.411], p=0.017. Scale-boundary recorded (harmful at 300M, positive at 671B).
• 06 Sinkhorn embeddings: FLAT. 4.5547; Δ −0.0903pp, CI95 [−0.267, +0.069], p=0.858. Module stands (Engram side-opt), recipe lever closed.

With these, every TODO.impl item is measured. 2.1 remains the frontier student; the only recorded frontier mover is data-side (teacher r5→r6→r7).