Initial commit: manifoldbt public repo

Python DSL, examples, docs, benchmarks, and tests.
Rust engine distributed as pre-compiled wheel via PyPI.

.gitignore

@@ -0,0 +1,32 @@
+# Python
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+*.so
+*.egg-info/
+dist/
+build/
+.venv/
+*.whl
+
+# Compiled Rust artifacts
+*.pdb
+target/
+
+# Data (not distributed)
+data/
+output/
+
+# IDE
+.vscode/
+.idea/
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Secrets
+*.key
+.env
+.env.*