Add C# Migration Status

C%23-Migration-Status.md

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+# C# Migration Status
+
+This page tracks the high-level backend migration from Python to C#.
+
+## Goal
+
+Build a C# backend that reaches behavior parity with Python for core workflows, then cut over frontend/backend integration when parity gates are met.
+
+## Current State
+
+- Python backend is still the production baseline.
+- C# backend is under `journal-master/journal/`.
+- Current slice is fragment-focused with sidecar transport and smoke tests.
+
+## Workspace
+
+Path:
+
+- `journal-master/journal/`
+
+Key files:
+
+- `journal-master/journal/README.md`
+- `journal-master/journal/MINIMAL_MACHINE_SETUP.md`
+- `journal-master/journal/Journal.Core/`
+- `journal-master/journal/Journal.Sidecar/`
+- `journal-master/journal/Journal.SmokeTests/`
+
+## Local Validation Commands
+
+```powershell
+cd journal-master/journal
+./scripts/dotnet-min.ps1 restore Journal.Sidecar/Journal.Sidecar.csproj
+./scripts/dotnet-min.ps1 build Journal.Sidecar/Journal.Sidecar.csproj
+./scripts/dotnet-min.ps1 run --project Journal.SmokeTests/Journal.SmokeTests.csproj
+```
+
+## Migration Approach
+
+- Phase-driven execution
+- Acceptance criteria and parity evidence per phase
+- Avoid frontend cutover until required P0 parity gates pass
+
+## Team Policy Notes
+
+- Security posture language: HIPAA-capable safeguards and architecture.
+- Do not claim legal HIPAA compliance certification from code artifacts alone.