py(deps[uv]) Bump gp-sphinx workspace pins to 0.0.1a15

why: Pick up the gp-sphinx 0.0.1a15 release. Bigger than the previous
a14 cumulative bump — a15 ships the workspace-owned Furo replacement.

For downstream consumers of gp-sphinx, the headline effects on next
`uv sync`:

- `furo` (and its transitive deps `accessible-pygments` +
  `sphinx-basic-ng`) drop out of the install tree. `sphinx-gp-theme`
  now inherits from `gp-furo` (a workspace-owned, Tailwind-v4
  port of @pradyunsg's Furo) instead of upstream `furo`.
- The CSS custom-property contract is preserved, so existing
  `light_css_variables` / `dark_css_variables` overrides keep
  working unchanged. Rendered output is visually equivalent to
  vanilla Furo modulo the gp-sphinx project layer already on top.
- Two new workspace packages ship: `gp-furo-theme` (standalone
  Furo-equivalent theme, available without the gp-sphinx project
  layer) and `gp-sphinx-vite` (transparent Vite + pnpm
  orchestration that no-ops in production wheels).
- Carries forward the a14 light-mode shell-output fix:
  `Generic.Prompt` is now purple and `Generic.Output` cyan in
  the `gp-sphinx-light` Pygments style.

what:
- pyproject.toml: gp-sphinx, sphinx-autodoc-argparse, sphinx-autodoc-api-style move ==0.0.1a14 -> ==0.0.1a15 in
  [dependency-groups] dev and docs.
- pyproject.toml: [tool.uv.exclude-newer-package] gains
  `gp-furo-theme = false` and `gp-sphinx-vite = false` entries.
  Both are new gp-sphinx workspace packages introduced in a15;
  without these exemptions, uv's global `exclude-newer` filter
  rejects them as too-new and fails resolution
  (`hint: ... was filtered by 'exclude-newer'`). Mirrors the
  per-package exemption pattern already in place for the rest of
  the gp-sphinx workspace.
- uv.lock: regenerated; gp-sphinx workspace siblings
  (sphinx-gp-theme, sphinx-ux-autodoc-layout, sphinx-ux-badges,
  sphinx-fonts, gp-furo-theme, gp-sphinx-vite, …) co-resolved to
  0.0.1a15.

ref: https://pypi.org/project/gp-sphinx/0.0.1a15/

Author: tony

pyproject.toml

@@ -59,9 +59,9 @@ dev = [
   # Docs
   "aafigure",
   "pillow",
-  "gp-sphinx==0.0.1a14",
-  "sphinx-autodoc-argparse==0.0.1a14",
-  "sphinx-autodoc-api-style==0.0.1a14",
+  "gp-sphinx==0.0.1a15",
+  "sphinx-autodoc-argparse==0.0.1a15",
+  "sphinx-autodoc-api-style==0.0.1a15",
   "gp-libs",
   "sphinx-autobuild",
   # Testing
@@ -85,9 +85,9 @@ dev = [
 docs = [
   "aafigure",
   "pillow",
-  "gp-sphinx==0.0.1a14",
-  "sphinx-autodoc-argparse==0.0.1a14",
-  "sphinx-autodoc-api-style==0.0.1a14",
+  "gp-sphinx==0.0.1a15",
+  "sphinx-autodoc-argparse==0.0.1a15",
+  "sphinx-autodoc-api-style==0.0.1a15",
   "gp-libs",
   "sphinx-autobuild",
 ]
@@ -120,7 +120,9 @@ build-backend = "hatchling.build"
 # committing a date that would age into the lockfile. Mirrors the
 # pattern at vcspull/pyproject.toml for libvcs.
 gp-libs = false
+gp-furo-theme = false
 gp-sphinx = false
+gp-sphinx-vite = false
 sphinx-autodoc-api-style = false
 sphinx-autodoc-argparse = false
 sphinx-autodoc-docutils = false