Add Setup and Installation

Setup-and-Installation.md

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+# Setup and Installation
+
+This page covers local setup for the Python baseline and optional C# migration workspace.
+
+## Prerequisites
+
+- Python `3.14`
+- `pip` and virtual environment support
+- Windows or Linux
+- Optional: GPU drivers/toolkit if using `requirements_gpu.txt`
+
+## Dependency Profiles
+
+- `requirements_base.txt`: shared runtime dependencies
+- `requirements_cpu_only.txt`: base + CPU AI stack
+- `requirements_gpu.txt`: base + GPU AI stack
+- `requirements_nlp_optional.txt`: optional spaCy backend
+
+## Windows Setup (CPU default)
+
+```powershell
+cd Project_Journal
+py -3.14 -m venv .venv
+.\.venv\Scripts\Activate.ps1
+python -m pip install --upgrade pip
+python -m pip install --extra-index-url https://download.pytorch.org/whl/cpu -r requirements_cpu_only.txt
+```
+
+Run desktop app:
+
+```powershell
+python .\journal\run_desktop.py
+```
+
+## Linux Setup (CPU default)
+
+```bash
+cd Project_Journal
+python3.14 -m venv .venv
+source .venv/bin/activate
+python -m pip install --upgrade pip
+python -m pip install --extra-index-url https://download.pytorch.org/whl/cpu -r requirements_cpu_only.txt
+```
+
+Run desktop app:
+
+```bash
+python ./journal/run_desktop.py
+```
+
+## Linux GPU Setup (optional)
+
+```bash
+cd Project_Journal
+python3.14 -m venv .venv
+source .venv/bin/activate
+python -m pip install --upgrade pip
+python -m pip install -r requirements_gpu.txt
+```
+
+## Optional NLP Backend (spaCy)
+
+```bash
+python -m pip install -r requirements_nlp_optional.txt
+python -m spacy download en_core_web_sm
+```
+
+NLP backend modes:
+
+- `auto` (default): spaCy if available, fallback otherwise
+- `spacy`: require spaCy and fail if unavailable
+- `fallback`: always use fallback NLP heuristics
+
+Examples:
+
+```powershell
+$env:JOURNAL_NLP_BACKEND = "fallback"
+python .\journal\run_desktop.py
+```
+
+```bash
+export JOURNAL_NLP_BACKEND=spacy
+python ./journal/run_desktop.py
+```
+
+## C# Migration Workspace Setup (optional)
+
+Location: `journal-master/journal/`
+
+Use:
+
+- `journal-master/journal/README.md`
+- `journal-master/journal/MINIMAL_MACHINE_SETUP.md`
+
+Quick check:
+
+```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
+```