initial: import DOLPHIN baseline 2026-04-21 from dolphinng5_predict working tree

Includes core prod + GREEN/BLUE subsystems:
- prod/ (BLUE harness, configs, scripts, docs)
- nautilus_dolphin/ (GREEN Nautilus-native impl + dvae/ preserved)
- adaptive_exit/ (AEM engine + models/bucket_assignments.pkl)
- Observability/ (EsoF advisor, TUI, dashboards)
- external_factors/ (EsoF producer)
- mc_forewarning_qlabs_fork/ (MC regime/envelope)

Excludes runtime caches, logs, backups, and reproducible artifacts per .gitignore.

nautilus_dolphin/dvae/exp5_dvae_twopass_results.json

@@ -0,0 +1,75 @@
+{
+  "results": {
+    "A_single_pass_b0.1": {
+      "auc": 0.6918441493851568,
+      "active_dims": 8,
+      "z_var": [
+        0.33613626115314765,
+        0.4036545839396876,
+        0.46812200154628386,
+        0.7897261382354528,
+        0.30868460378586354,
+        0.6207298112610948,
+        0.654486990717734,
+        0.6487686368882809
+      ]
+    },
+    "B_twopass_b4_b0.1": {
+      "auc": 0.685815978891897,
+      "active_dims": 8,
+      "z_var": [
+        0.6463562800257637,
+        0.794515080808024,
+        0.6627231420838106,
+        0.3360878581568057,
+        0.5536564847674447,
+        0.47145868605069,
+        0.6024979573116871,
+        0.15243441499985075
+      ]
+    },
+    "C_twopass_b2_b0.1": {
+      "auc": 0.6876680380817412,
+      "active_dims": 8,
+      "z_var": [
+        0.13887391434276264,
+        0.6846345552164088,
+        0.5075111792873924,
+        0.6646689437418141,
+        0.1307330087594524,
+        0.5100345972756644,
+        0.7035295234945932,
+        0.7401098727154677
+      ]
+    },
+    "D_dual_b4_b0.1": {
+      "auc": 0.6771870187460258,
+      "active_dims_hi": 1,
+      "active_dims_lo": 8,
+      "z_var_hi": [
+        0.016414329885322456,
+        0.13325390881853802,
+        0.00914966636326114,
+        0.015184221145285375,
+        0.012848108781067335,
+        0.00813838316387418,
+        0.023348222620207693,
+        0.027649003388626463
+      ],
+      "z_var_lo": [
+        0.5964793155326009,
+        0.506480565733225,
+        0.14274180282824042,
+        0.3696797264506598,
+        0.7152758659328332,
+        0.4816811876862482,
+        0.45584810995992486,
+        0.7347258490907227
+      ]
+    }
+  },
+  "baseline_auc": 0.6918441493851568,
+  "gate_threshold": 0.02,
+  "winner": "A_single_pass_b0.1",
+  "note": "beta=12 not tested (collapses; beta=6 already showed 0/20 active dims)"
+}