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/direct/aha.txt

@@ -1,5 +1,5 @@
-She'd been working through the problem, sifting through all the disparate parts — then suddenly the pieces arranged themselves in a single motion. She sat there, catching up to what she'd already seen.
+It clicks. The graph she's been staring at for an hour is a mirror — the left peak is the reflection, not a separate event. Everything she thought was two things is one. She sits back. She has to catch up to what she's just seen.
 
-He'd been listening to her for twenty minutes, something not adding up in the way she was telling it — then the gap showed itself. She was telling him two different stories at once, hoping he wouldn't notice. He saw the whole shape of it.
+"Wait, say that again." She puts her coffee down. "The study was funded by whom?" He tells her again, same words. And there it is. The conclusion of that paper has been sitting on her desk for a month, and the funder is the exact company whose competitor the paper is trashing. She almost laughs. The whole shape of it is suddenly visible.
 
-She'd been reading the old letter without understanding what her father meant — then the meaning unfolded. He hadn't been warning her; he'd been telling her he was leaving. Twenty years later, in her kitchen, the piece that had been missing was finally there.
+He read the line three times. Something about the tense was wrong. And then, all at once, he understood. His brother hadn't been describing what happened; he'd been describing what he wished had happened. The whole letter was an apology for something that had gone differently in reality. It rearranged every previous conversation they'd ever had.