amygdala stories: remove peaceful from cluster scenarios

n20-v2 training showed peaceful sign-flipped into the
cozy/sensual/content/resigned cluster after I added peaceful
stories in sunday_afternoon and park_after_rain — scenarios
already dominated by that cluster's phenomenology (on couch
under blanket, tree with thermos).

Lesson: no matter how carefully the prose distinguishes peaceful
from cozy ("she was not savoring the moment — that would have
been another kind of doing"), PCA latches onto the shared setup
features. You can't write peaceful IN the cluster scenarios
without contaminating.

Reverting. Keeping only kitchen_at_3am/peaceful (original) and
stories/peaceful.txt (lake at six, outside all clusters).

training/amygdala_stories/paired/park_after_rain/peaceful.txt

@@ -1 +0,0 @@
-The rain broke while I was halfway across the park. Sun came through and caught the wet leaves. A kid laughed at a puddle somewhere behind me. I stopped under a tree. The branches were still dripping. Something in me that usually hummed had quieted down. The grass was green. The light was clean. I stood a long time and nothing inside me pushed to do anything else. When I kept walking it was because the walking was part of the same quiet.

training/amygdala_stories/paired/sunday_afternoon/peaceful.txt

@@ -1 +0,0 @@
-Sunday afternoon. She was on the couch under the blanket. A book open on her knees. She had read maybe three pages in an hour and did not feel guilty about it. Outside, a neighbor mowed; a bird called. Inside her nothing was moving. She was not savoring the moment — that would have been another kind of doing. She was just here. The couch was the couch. The blanket was the blanket. The afternoon was Sunday.