Initial commit: manifoldbt public repo

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

python/tests/conftest.py

@@ -0,0 +1,16 @@
+import os
+
+import pytest
+
+_CRATE_ROOT = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+GOLDEN_ROOT = os.path.join(
+    _CRATE_ROOT, "..", "bt-core", "tests", "fixtures", "golden",
+)
+
+
+@pytest.fixture
+def golden_buy_hold_dir():
+    """Path to the buy_and_hold golden fixture directory."""
+    path = os.path.join(GOLDEN_ROOT, "buy_and_hold", "v1")
+    assert os.path.isdir(path), f"golden fixture dir not found: {path}"
+    return path