embeddings.json: 838 chunks from 94 stories, seeds (11, 12, 13)

   k  sized>=5  median dom  recurring  coverage  tight rec  tight cov
----------------------------------------------------------------------
  25        25        0.25         21      93%          9       29%
  40        39        0.36         21      71%          5        9%
  60        55        0.57         20      55%          3        2%
 100        78        0.67         16      30%          0        0%

recurring = size>=5, stories>=4, dominant share<=40%; tight = coherence at or above this file's median cluster. Judge at k>=60. Wrote embeddings.measure.json
exit 0