Verify the 0.9.6 integration checkpoint

docs/RELEASING.md

@@ -103,6 +103,11 @@ 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.
 
+Always run the release build from a clean checkout or detached worktree. Godot
+can pack files from ignored `tmp/` and old `build/` folders into the PCK; the
+0.9.6 dirty-tree build produced 1.6–3.1 GB artifacts, while the clean worktree
+produced the expected ~160–240 MB packages.
+
 Locally you can build the AppImage with `bash packaging/linux/build_appimage.sh <version>`;
 the NSIS installer requires `makensis` (covered by CI).