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.

Observability/TUI/_find_textual.py

@@ -0,0 +1,8 @@
+import sys, textual, textual.widgets as w
+print("python:", sys.executable)
+print("version:", textual.__version__)
+print("location:", textual.__file__)
+widgets = sorted([x for x in dir(w) if x[0].isupper()])
+print("widgets:", widgets)
+import textual.containers as c
+print("containers:", sorted([x for x in dir(c) if x[0].isupper()]))