Add matched four-head nanoGPT baseline - #120
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Adds a tracked four-head (
n_embd=128, 4×32 heads) AdamW–MuonClip configuration using the same four-epoch schedule and five paired seeds as the one-head campaign. Generalizes the one-block model/config validation to accept valid head counts while preserving existing one-head behavior. Adds tests for equal parameter count, four-head forward propagation, campaign configuration, and independent per-head MuonClip QK clipping.Validation:
26 passedacrosstest_one_head.pyandtest_muonclip.py.