Import CAD projects and cad-router v1

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+# Benchmark Models
+
+Benchmark CAD fixtures for repeatable geometry generation, import/export, and
+viewer behavior checks. Each benchmark is intentionally more structured than the
+small examples in `../simple/` and is meant to exercise a distinct modeling
+surface.
+
+## Contents
+
+- `benchmark_*.py`: build123d generator source for each benchmark.
+- `benchmark_*.step`: canonical generated STEP output for each benchmark.
+- `.benchmark_*.step.glb`: generated render/selector sidecar paired with the
+  STEP file.
+- `benchmark_common.py`: shared helper functions for benchmark generators.
+- `validate_benchmark.py`: local benchmark validation helper.
+
+## Coverage
+
+The benchmark set covers calibration blocks, flanges, brackets, shafts,
+enclosures, clevises, engine-like fins, impellers, spiral stairs, and planetary
+gear stages.
+
+Keep benchmark examples here when they are intended as regression fixtures or
+represent a richer version of a simpler shape.