py(deps[dev]): Add local gp-sphinx preview wiring for libvcs docs

why: Testing the new pytest-plugin docs helper in libvcs requires the local
gp-sphinx workspace packages instead of the published package set.
what:
- add temporary uv.sources overrides for gp-sphinx preview packages
- add sphinx-autodoc-pytest-fixtures to the docs dependency set
- refresh uv.lock for the preview environment

Author: tony

pyproject.toml

@@ -65,6 +65,7 @@ Changes = "https://github.com/vcs-python/libvcs/blob/master/CHANGES"
 dev = [
   # Docs
   "gp-sphinx==0.0.1a1",
+  "sphinx-autodoc-pytest-fixtures==0.0.1a1",
   "gp-libs",
   "sphinx-autobuild",
   # Testing
@@ -84,6 +85,7 @@ dev = [
 
 docs = [
   "gp-sphinx==0.0.1a1",
+  "sphinx-autodoc-pytest-fixtures==0.0.1a1",
   "gp-libs",
   "sphinx-autobuild",
 ]
@@ -220,6 +222,10 @@ filterwarnings = [
   "ignore:The frontend.Option(Parser)? class.*:DeprecationWarning::",
 ]
 
+[tool.uv.sources]
+gp-sphinx = { path = "../gp-sphinx/packages/gp-sphinx", editable = true }
+sphinx-autodoc-pytest-fixtures = { path = "../gp-sphinx/packages/sphinx-autodoc-pytest-fixtures", editable = true }
+
 [tool.pytest-watcher]
 now = true
 ignore_patterns = ["*.py.*.py"]