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

tests/__init__.py

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+# CAD-Documenter tests

tests/test_pipeline.py

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+"""Basic tests for CAD-Documenter pipeline."""
+
+import pytest
+from pathlib import Path
+
+
+def test_imports():
+    """Test that all modules can be imported."""
+    from cad_documenter import __version__
+    from cad_documenter.cli import main
+    from cad_documenter.pipeline import DocumentationPipeline
+    from cad_documenter.video_processor import VideoProcessor
+    from cad_documenter.audio_analyzer import AudioAnalyzer
+    from cad_documenter.vision_analyzer import VisionAnalyzer
+    from cad_documenter.doc_generator import DocGenerator
+
+    assert __version__ == "0.1.0"
+
+
+def test_transcript_dataclass():
+    """Test Transcript dataclass functionality."""
+    from cad_documenter.audio_analyzer import Transcript, TranscriptSegment
+
+    segments = [
+        TranscriptSegment(start=0.0, end=5.0, text="This is the main bracket"),
+        TranscriptSegment(start=5.0, end=10.0, text="It holds the motor"),
+        TranscriptSegment(start=10.0, end=15.0, text="Made of aluminum"),
+    ]
+
+    transcript = Transcript(segments=segments, full_text="This is the main bracket. It holds the motor. Made of aluminum.")
+
+    # Test get_text_at
+    text = transcript.get_text_at(7.0, window=3.0)
+    assert "holds the motor" in text
+    assert "main bracket" in text
+
+
+def test_component_dataclass():
+    """Test Component dataclass."""
+    from cad_documenter.vision_analyzer import Component
+
+    component = Component(
+        name="Main Bracket",
+        description="Primary structural member",
+        function="Holds the motor",
+        material="Aluminum 6061-T6",
+        features=["4x M6 holes", "Fillet radii"],
+    )
+
+    assert component.name == "Main Bracket"
+    assert len(component.features) == 2
+
+
+# TODO: Add integration tests with sample videos