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Delete or justify the mood-congruence asymmetry #9

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@kevindechang

mood_congruence_factor multiplies a same-sign memory by 1.06 in a negative mood and 1.03 in a positive one. Mood-congruent recall itself is Bower (1981), but no citation in docs/foundations.md supports the asymmetry — it is one product's tuning.

bench/ experiment E puts it in a regime built to favour it: correct memories share the mood's sign 75% of the time. It is worth +0.012 MRR. It does not hurt, and it does not clearly earn an unexplained constant.

This is falsification item (4). Two acceptable outcomes:

  1. Find a regime where it matters, add it to bench/, and the constant is justified.
  2. Show it never matters much, and collapse congruence_negative_mood / congruence_positive_mood into one symmetric value — or remove the term.

Either is a real contribution. The current state — a constant nobody can defend and nobody has removed — is the worst of the three.

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