Add the optional Forward+ desktop HQ build

Package a Forward+ preset with volumetric fog, SDFGI and a volumetric flashlight
for a separate Linux/Windows Desktop HQ zip. Gate the effects on a real
RenderingDevice, tune LATE fog, and adapt local light falloff for Godot 4.7.
Record the Compatibility/Forward+ A/B captures and metrics, add the artifact to
the build/publish scripts, and keep the default Compatibility/Web path
unchanged. Headless 231/231, Python 87/87; exported HQ binary boots with Vulkan.

docs/RELEASING.md

@@ -87,6 +87,8 @@ Artifacts are written to `build/` (all exports embed the PCK — single files):
 - `build/gig-line-macos-<version>.zip`
 - `build/gig-line-web-<version>.zip` — browser build (non-threaded Godot web
   template; unzip and serve the folder, no COOP/COEP headers required)
+- `build/gig-line-desktop-hq-<version>.zip` — optional Forward+ Windows/Linux
+  build with `override.cfg`; requires a Vulkan-capable GPU/driver
 
 When run in CI (tags/dispatch), the build job also packages:
 
@@ -95,6 +97,10 @@ When run in CI (tags/dispatch), the build job also packages:
 - `build/gig-line-<version>-x86_64.AppImage` — Linux AppImage (`packaging/linux/build_appimage.sh`,
   appimagetool via `APPIMAGE_EXTRACT_AND_RUN`)
 
+The optional Desktop HQ zip is assembled by `tools/build_releases.sh` from
+`packaging/desktop_hq/`; keep `override.cfg` next to the extracted executable.
+It is not part of the default Compatibility/Web build.
+
 Locally you can build the AppImage with `bash packaging/linux/build_appimage.sh <version>`;
 the NSIS installer requires `makensis` (covered by CI).
 
@@ -115,7 +121,8 @@ GITEA_TOKEN=your_api_token ./tools/publish_release.sh 0.2.1
 
 The script creates (or reuses) the release from `project.godot`'s
 `config/version`, uploads the three portable artifacts **plus** the NSIS
-installer and AppImage when present, and prints the release URL. If CI already
+installer, AppImage, Web zip and Desktop HQ zip when present, and prints the
+release URL. If CI already
 published the release, re-running the script only adds missing assets.
 
 > **Host note**: the release is fully built by CI, but anonymous users can only