feat: switch wolfxl dependency from git URL to PyPI

wolfxl v0.1.0 is now published on PyPI with pre-built wheels for
Linux/macOS/Windows. Replace git URL with version spec and remove
the allow-direct-references hatch workaround.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: wolfiesch

pyproject.toml

@@ -43,7 +43,7 @@ dev = [
     "mypy>=1.0",
 ]
 rust = [
-    "wolfxl @ git+https://github.com/wolfiesch/wolfxl.git",
+    "wolfxl>=0.1.0",
 ]
 docs = [
     "mkdocs-material>=9.5",
@@ -58,9 +58,6 @@ excelbench = "excelbench.cli:app"
 requires = ["hatchling"]
 build-backend = "hatchling.build"
 
-[tool.hatch.metadata]
-allow-direct-references = true
-
 [tool.hatch.build.targets.wheel]
 packages = ["src/excelbench"]