docs(api) Visual improvements via gp-sphinx (#67)

Adopt the gp-sphinx Sphinx package stack for gp-libs's API
documentation. The net visual effect is card-style autodoc
signatures with safety and scope badges, MyST cross-reference
roles for Python objects, scoped section names in multi-page CLI
docs, and polished IBM Plex typography — all landing together from
the gp-sphinx 0.0.1a7 pre-release.

- **API-style autodoc layout** via sphinx-autodoc-api-style —
  card layouts, badges, MyST roles for Python objects
- **Shared badge layer** via sphinx-autodoc-badges — consistent
  XS/SM/LG/XL size variants with WCAG-AA contrast
- **Multi-page argparse scoping** via sphinx-argparse-neo — CLI
  doc builds no longer emit duplicate-label warnings
  (git-pull/gp-sphinx#16)
- **Font polish** via sphinx-fonts — IBM Plex Sans and Mono at
  full weight range, zero-CLS loading

See gp-sphinx 0.0.1a7 release notes for the full list of changes
covering 0.0.1a1..0.0.1a7:
https://github.com/git-pull/gp-sphinx/blob/v0.0.1a7/CHANGES

Author: tony

CHANGES

@@ -41,6 +41,7 @@ $ uvx --from 'gp-libs' --prerelease allow gp-libs
 ### Documentation
 
 - Migrate docs deployment to AWS OIDC authentication and AWS CLI
+- Visual improvements to API docs from [gp-sphinx](https://gp-sphinx.git-pull.com)-based Sphinx packages (#67)
 
 ## gp-libs 0.0.17 (2025-12-07)
 

docs/conf.py

@@ -29,6 +29,7 @@
     source_branch="master",
     light_logo="img/icons/logo.svg",
     dark_logo="img/icons/logo-dark.svg",
+    extra_extensions=["sphinx_autodoc_api_style"],
     intersphinx_mapping={
         "py": ("https://docs.python.org/", None),
         "pytest": ("https://docs.pytest.org/en/stable/", None),

pyproject.toml

@@ -48,7 +48,8 @@ Changes = "https://github.com/git-pull/gp-libs/blob/master/CHANGES"
 [dependency-groups]
 dev = [
   # Docs
-  "gp-sphinx==0.0.1a1",
+  "gp-sphinx==0.0.1a7",
+  "sphinx-autodoc-api-style==0.0.1a7",
   "gp-libs",
   "sphinx-autobuild",
   # Testing
@@ -69,7 +70,8 @@ dev = [
 ]
 
 docs = [
-  "gp-sphinx==0.0.1a1",
+  "gp-sphinx==0.0.1a7",
+  "sphinx-autodoc-api-style==0.0.1a7",
   "gp-libs",
   "sphinx-autobuild",
 ]