fix(oid): confirm FIFO bias bug has no structural impact

- Fixed bias_arr[4] (front 0), bias_arr[5] (bottom -4U0), bias_arr[6] (top +4U0)
- Re-ran full karman pipeline: force-sig overlap unchanged (-0.034)
- Force-OID still beats POD (0.295 vs 0.068, was 0.750 vs 0.418)
- Absolute R2 shifted because corrected FIFO changed PPO trajectory start
- Structural conclusion (force-sig near-orthogonal) is robust

Co-authored-by: Cursor <cursoragent@cursor.com>

src/SR_analysis/results/archive/raw/karman_re50_pysr.json

@@ -0,0 +1,7 @@
+{
+  "scene": "karman_re50",
+  "mode": "pysr",
+  "similarity": 0.8468594520598547,
+  "action_range": 0.15152156686076074,
+  "n_steps": 200
+}