chore: clean up repo — add .gitignore, README, remove tracked build artifacts and old_source

- Add .gitignore for bin/, obj/, .vs/, old_source/, IDE files
- Remove 1145 tracked files that should never have been committed
- Add README.md with project overview and build instructions
- Trim CLAUDE.md, add .claudeignore, skills, and PreToolUse hook
- old_source/ is recoverable from the initial commit (6e1b929) if needed

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -0,0 +1,49 @@
+# HC_APTBS
+
+WPF desktop application for controlling a VP44 diesel injection pump test bench.
+
+## Features
+
+- **CAN bus communication** — reads/writes bench sensors (temperature, RPM, flow) via PCAN-Basic at 500 kbps
+- **K-Line / KWP2000** — communicates with the VP44 pump ECU via FTDI USB adapter at 9600 bps
+- **Automated test sequences** — runs multi-phase tests with PID temperature control
+- **PDF reports** — generates test result reports with QuestPDF
+
+## Requirements
+
+- Windows 10/11 (x64)
+- [.NET 10 SDK](https://dotnet.microsoft.com/) (version pinned in `global.json`)
+- Hardware: PCAN-USB adapter, FTDI USB-to-serial adapter
+
+## Build
+
+```bash
+dotnet build -r win-x64
+```
+
+Native DLLs (`PCANBasic.dll`, `ftd2xx.dll`) are bundled in `Resources/Native/` and copied to output automatically.
+
+## Stack
+
+| Layer | Technology |
+|-------|-----------|
+| UI | WPF / XAML |
+| MVVM | CommunityToolkit.Mvvm |
+| DI | Microsoft.Extensions.DependencyInjection |
+| Charts | LiveCharts2 (SkiaSharp) |
+| PDF | QuestPDF 2025.3.2 |
+| CAN | PCAN-Basic (P/Invoke) |
+| K-Line | FTDI D2XX (P/Invoke) |
+
+## Project Structure
+
+```
+Infrastructure/
+  Pcan/          — CAN bus adapter, OEM legitimation, sensor decoding
+  Kwp/           — FTDI interface, KWP/KW1281 protocol, 5-baud slow-init
+  Logging/       — Daily rotating log files
+Services/Impl/   — Test orchestration, KWP operations, config persistence, PDF
+ViewModels/      — MVVM view models (ObservableProperty / RelayCommand)
+Views/           — Pure XAML views
+Models/          — Domain models and test definitions
+```