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.

prod/prefect_scan_bridge.yaml

@@ -0,0 +1,51 @@
+# DOLPHIN Scan Bridge - Prefect Deployment
+# ========================================
+# Long-running service with self-healing
+#
+# Deploy:
+#   prefect deploy prefect_scan_bridge.yaml
+# 
+# Start worker:
+#   prefect worker start --pool dolphin-services
+
+name: dolphin-scan-bridge
+prefect-version: "3.0"
+
+pull:
+  - prefect.deployments.steps.set_working_directory:
+      directory: /mnt/dolphinng5_predict/prod
+
+deployments:
+  - name: scan-bridge
+    entrypoint: scan_bridge_prefect_flow.py:scan_bridge_flow
+    work_pool:
+      name: dolphin-services
+    description: |
+      Continuous scan bridge service.
+      Watches Arrow files → pushes to Hazelcast.
+      Self-healing, idle-mode when no scans.
+    
+    # Infrastructure hints
+    infrastructure:
+      type: process
+      
+    # The flow runs forever (daemon mode)
+    # Prefect will restart it if it crashes
+    parameters: {}
+    
+    # Tags for organization
+    tags:
+      - infrastructure
+      - data-ingestion
+      - scan-bridge
+      - daemon
+    
+    # Schedule: run continuously
+    # (no schedule = run on deployment start, restart on failure)
+    schedules: []
+    
+    # Enforcements
+    enforce_parameter_schema: false
+    
+    # Concurrency: only one instance
+    concurrency_limit: 1