search in parent dir (#306)

Fixes:  #164

---------

Co-authored-by: Clawdbot <clawdbot@users.noreply.github.com>

__tests__/fixtures/parent-config-project/pyproject.toml

@@ -0,0 +1,13 @@
+[project]
+name = "parent-config-project"
+version = "0.1.0"
+description = "Test fixture for parent directory pyproject.toml search"
+readme = "README.md"
+requires-python = ">=3.12"
+dependencies = [
+    "ruff==0.10.0",
+]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"

__tests__/fixtures/parent-config-project/subproject/hello.py

@@ -0,0 +1,3 @@
+"""Hello world example."""
+
+print("Hello, world!")