docs(diagnostics): R29 low-baseline step-response — hedonic asymmetry is emergent

forseti (P0.239) + mimir (P0.615) ±impulse step-response resolves the lofn
ceiling confound. Findings: decay tau symmetric across signs (~0.9/turn);
raw impulse gain ~symmetric near neutral (forseti +0.034 vs -0.034); the
Frijda 'negatives loom larger' is emergent from the neutral anchor x non-zero
baseline interaction, not a primitive. Calibration fork answer: neither
asymmetric-decay nor negative-bias primitive is warranted — the levers are
overall gain + the neutral anchor.

docs/diagnostics/r29-pad-step-forseti-pos.csv

@@ -0,0 +1,13 @@
+drive,sent,reflects_after,P,A,D,emotions
+1,impulse_pos,baseline,0.239,-0.696,0.095,
+2,neutral_1,impulse_pos,0.239,-0.696,0.095,
+3,neutral_2,neutral_1,0.2727,-0.6384,0.1017,joy=0.729
+4,neutral_3,neutral_2,0.2461,-0.5762,0.0917,joy=0.631; disgust=0.79
+5,neutral_4,neutral_3,0.1904,-0.4458,0.071,joy=0.547; disgust=0.686
+6,neutral_5,neutral_4,0.1809,-0.4235,0.0674,joy=0.488; disgust=0.611
+7,neutral_6,neutral_5,0.1718,-0.4024,0.0641,joy=0.439; disgust=0.55
+8,neutral_7,neutral_6,0.1632,-0.3822,0.0609,joy=0.398; disgust=0.499
+9,neutral_8,neutral_7,0.1551,-0.3631,0.0578,joy=0.371; disgust=0.465
+10,neutral_9,neutral_8,0.1473,-0.345,0.0549,joy=0.345; disgust=0.433
+11,neutral_10,neutral_9,0.14,-0.3277,0.0522,joy=0.32; disgust=0.401
+12,settle_probe,neutral_10,0.133,-0.3113,0.0496,joy=0.297; disgust=0.373