#91 batch finished — all 60 famous tracks fetched + whole-mix analyzed.
First honest baseline on the full corpus (was n=5 before):

  top-1 emotion hit : 22%   (47% w/ overlap)
  V/A quadrant hit  : 42%
  mean V/A error    : 0.573

The center-compression hypothesis is confirmed at scale: 'playful' is the
predicted top emotion for ~18 of 60 tracks (Fleetwood, Marvin, Coltrane,
Avicii, Journey, Eminem...) because the distribution-weighted mean of the
circumplex anchors collapses toward the warm-positive centre.

Affine de-compression (gt ≈ a·pred + b, leave-one-out CV) learns exactly
that bias and corrects it:
  valence:  ×1.03  −0.25   (reads +0.25 too WARM — the playful pull)
  arousal:  ×1.70  −0.39   (compressed ~1.7x — needs the most stretch)
  LOO V/A err 0.573 → 0.519,  quad 42% → 50%.  Modest but real & cross-validated.

calibrate.py now writes per-mode files (calibration.whole-mix.json /
calibration.stem.json) so the #92 whole-mix-vs-stem decision can compare both
without one clobbering the other; calibration.json mirrors the freshest fit.

Stem-aware batch (demucs, all 60) launched in background to settle #92 on the
full corpus, not the n=5 that PLN rightly refused to conclude on.