Initial project scaffold - Phase 1 MVP structure

Core modules:
- cli.py: Command-line interface with Click
- pipeline.py: Main orchestrator
- video_processor.py: Frame extraction with ffmpeg
- audio_analyzer.py: Whisper transcription
- vision_analyzer.py: Component detection (placeholder)
- doc_generator.py: Markdown + PDF output

Also includes:
- pyproject.toml with uv/hatch config
- Prompts for AI analysis
- Basic tests
- ROADMAP.md with 4-week plan

pyproject.toml

@@ -0,0 +1,38 @@
+[project]
+name = "cad-documenter"
+version = "0.1.0"
+description = "Video walkthrough → Complete engineering documentation"
+readme = "README.md"
+requires-python = ">=3.12"
+license = {text = "MIT"}
+authors = [
+    {name = "Antoine Letarte", email = "antoine.letarte@gmail.com"},
+]
+dependencies = [
+    "click>=8.1.0",
+    "rich>=13.0.0",
+    "pydantic>=2.0.0",
+    "jinja2>=3.1.0",
+    "openai-whisper>=20231117",
+    "pillow>=10.0.0",
+]
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=8.0.0",
+    "ruff>=0.1.0",
+]
+
+[project.scripts]
+cad-doc = "cad_documenter.cli:main"
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/cad_documenter"]
+
+[tool.ruff]
+line-length = 100
+target-version = "py312"