chore: initial project scaffold from architecture design
- Add CLAUDE.md with project overview, tech stack, build commands,
architecture description, coding standards, and sample images section
- Add full directory structure: src/, docs/, tests/, import/
- Add CMakeLists.txt with C++20, OpenCV/LibRaw/Qt6 dependencies,
converter_core static lib, optional GUI, and GTest tests
- Add architecture documentation: ARCHITECTURE.md, PIPELINE.md, MODULES.md
- Add source skeletons for all pipeline stages:
RawLoader, Preprocessor, NegativeDetector, Inverter, ColorCorrector,
CropProcessor, OutputWriter, Pipeline, MainWindow, CliRunner, main.cpp
- Add initial test stubs for pipeline and rawloader
- Add sample ARW files in import/ for integration testing
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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