pkg(workspace): retire gp-sphinx-vite — sphinx-vite-builder is the sole vite extension

why: Phase 3 Milestone C — gp-sphinx-vite's hooks + config were ported
to sphinx_vite_builder._internal in earlier commits, all consumer call
sites swept to the new package, and the gp-sphinx-vite package itself
has nothing left to ship. Drop the package, delete its tests (the
ported tests in tests/test_sphinx_vite_builder_{config,hooks,
extension_integration}.py cover the same surface), and add a rediraffe
redirect from packages/gp-sphinx-vite → packages/sphinx-vite-builder
so existing inbound docs links keep resolving.

what:
- Delete packages/gp-sphinx-vite/ (5 source files + README + pyproject)
- Delete tests/test_gp_sphinx_vite{,_bus,_hooks,_integration,_process}.py
- Delete docs/packages/gp-sphinx-vite.md
- Drop gp-sphinx-vite from workspace pyproject.toml ([tool.uv.sources]
  + [dependency-groups] dev) and regenerate uv.lock
- Drop smoke_gp_sphinx_vite + the dispatch entry from
  scripts/ci/package_tools.py
- Drop "gp-sphinx-vite" from tests/test_package_reference.py's
  workspace-package set assertion
- docs/index.md: drop packages/gp-sphinx-vite from the Internal toctree
- docs/packages/index.md: drop the bullet
- docs/redirects.txt: add `packages/gp-sphinx-vite packages/sphinx-vite-builder`
  rediraffe redirect; map the legacy `extensions/gp-sphinx-vite` to the
  new package too
- docs/architecture.md: drop the gp-sphinx-vite grid card (sphinx-vite-builder
  card already documents both heads)
- README.md: collapse the Build utils bullet to mention only sphinx-vite-builder

Author: tony

README.md

@@ -62,7 +62,7 @@ Lower layers never depend on higher ones:
 
 - **Common libraries** — `sphinx-ux-badges`, `sphinx-ux-autodoc-layout`, `sphinx-autodoc-typehints-gp`, `sphinx-fonts`
 - **Autodoc extensions** — `sphinx-autodoc-api-style`, `sphinx-autodoc-argparse`, `sphinx-autodoc-docutils`, `sphinx-autodoc-fastmcp`, `sphinx-autodoc-pytest-fixtures`, `sphinx-autodoc-sphinx`
-- **Build utils** — `sphinx-vite-builder` ([PEP 517](https://peps.python.org/pep-0517/) backend that runs Vite via pnpm), `gp-sphinx-vite` (autobuild orchestrator)
+- **Build utils** — `sphinx-vite-builder` ([PEP 517](https://peps.python.org/pep-0517/) backend + Sphinx extension that runs Vite via pnpm)
 - **Theme and coordinator** — `gp-sphinx`, `sphinx-gp-theme`, `gp-furo-theme`
 - **SEO** — `sphinx-gp-opengraph`, `sphinx-gp-sitemap` (auto-loaded by `gp-sphinx` when `docs_url` is set)
 

docs/architecture.md

@@ -140,16 +140,6 @@ hatchling. Also a Sphinx extension that auto-orchestrates
 Source builds error loudly without pnpm/Node; wheels ship turn-key.
 :::
 
-:::{grid-item-card} gp-sphinx-vite
-:link: packages/gp-sphinx-vite
-:link-type: doc
-
-Autobuild-time Vite orchestrator opted into via
-`merge_sphinx_config(vite_orchestration=True)`. Spawns the watcher as
-a child process for the lifetime of `sphinx-autobuild`, with graceful
-SIGTERM teardown on exit.
-:::
-
 ::::
 
 ## How the tiers connect

docs/index.md

@@ -133,7 +133,6 @@ packages/sphinx-autodoc-typehints-gp
 packages/gp-sphinx
 packages/sphinx-gp-theme
 packages/gp-furo-theme
-packages/gp-sphinx-vite
 packages/sphinx-vite-builder
 ```
 

docs/packages/gp-sphinx-vite.md

@@ -35,7 +35,6 @@ Domain-specific [autodoc extensions](https://www.sphinx-doc.org/en/master/usage/
 [PEP 517](https://peps.python.org/pep-0517/) backends and orchestration helpers for theme asset pipelines:
 
 - [`sphinx-vite-builder`](sphinx-vite-builder.md) — [PEP 517](https://peps.python.org/pep-0517/) backend + Sphinx extension that runs Vite via pnpm
-- [`gp-sphinx-vite`](gp-sphinx-vite.md) — autobuild orchestrator opt-in via `vite_orchestration=True`
 
 ## Theme and coordinator
 

docs/packages/index.md

@@ -13,8 +13,9 @@ extensions/sphinx-ux-autodoc-layout packages/sphinx-ux-autodoc-layout
 extensions/sphinx-fonts packages/sphinx-fonts
 extensions/sphinx-gp-theme packages/sphinx-gp-theme
 extensions/gp-furo-theme packages/gp-furo-theme
-extensions/gp-sphinx-vite packages/gp-sphinx-vite
+extensions/gp-sphinx-vite packages/sphinx-vite-builder
 extensions/sphinx-vite-builder packages/sphinx-vite-builder
+packages/gp-sphinx-vite packages/sphinx-vite-builder
 extensions/sphinx-autodoc-typehints-gp packages/sphinx-autodoc-typehints-gp
 extensions/sphinx-argparse-neo packages/sphinx-autodoc-argparse
 extensions/sphinx-gptheme packages/sphinx-gp-theme