amygdala: fix listless sign-flip + diversify aha sentence structure

listless had a single story in stories/ — PCA signal from ~5
samples is weak enough to sign-flip. Training showed listless
anti-aligned with its semantic neighbors: +0.79 with grateful,
-0.44 with grief_stricken, -0.30 with lonely, -0.31 with bored.
Move to direct/ (multi-positive) with 3 stories: original
afternoon-in-pajamas + end-of-workday + weekend-morning-in-bed.

aha was still clustering with the other former-direct concepts
(resigned 0.66, onto_something 0.63, anticipatory_grief 0.60)
because all 3 aha stories used the identical "X'd been Y — then
Z" structure, which resigned/onto_something/creative also use.
Rewrite with three distinct syntactic structures:
  - present tense declarative ("It clicks. ...")
  - dialog embedded ('"Wait, say that again."  ...')
  - past tense cognitive ("He read the line three times. ...")

No explicit "she was X" anchors; state conveyed through action.

training/amygdala_stories/stories/listless.txt

@@ -1 +0,0 @@
-It was two in the afternoon and she was still in pajamas. The book was open on her knee but she hadn't turned the page in twenty minutes. She wasn't sad exactly, she just wasn't anything. The idea of showering felt theoretical. The idea of replying to any of the texts felt enormous. She got up to get water and on her way back lay on the couch instead. Outside the window a bird did bird things. She watched it without interest. Eventually the light changed and she realized it was evening and she hadn't moved and the day had happened to somebody else.