Add desktop binary export support to the examples

win-x86, win-x64, linux-x64 and mac-universal targets, validated on
the pong pipeline: Makefile binaries/ci-binaries targets, desktop
export presets, ci-binaries step in the Woodpecker example. Mac is a
single universal (intel + arm) build with built-in ad-hoc codesign and
needs ETC2 ASTC texture import enabled in project.godot.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

README.md

@@ -5,17 +5,20 @@ projects, in the same spirit as [ebitengine-tools](../ebitengine-tools)
 and [tic80-tools](../tic80-tools).
 
 - `example-makefile.make` — project Makefile: local dev targets
-  (`build`, `run`, `web`, `export`, `watch`, `clean`) plus the
-  Woodpecker pipeline targets (`ci-version`, `ci-export`, `ci-upload`,
-  `ci-update`).
+  (`build`, `run`, `web`, `export`, `watch`, `clean`), the desktop
+  binary targets (`binaries`, `binary-win-x86`, `binary-win-x64`,
+  `binary-linux-x64`, `binary-mac-universal`) plus the Woodpecker
+  pipeline targets (`ci-version`, `ci-export`, `ci-binaries`,
+  `ci-upload`, `ci-update`).
 - `example-woodpecker.yaml` — Woodpecker pipeline: version → build
-  (headless web export in the `barichello/godot-ci` image) → upload
-  (scp to the droparea) → update (calls the teletypegames `/update`
-  endpoint with `platform=godot`).
-- `example-export_presets.cfg` — minimal `export_presets.cfg` with the
-  **Web** preset the Makefile exports. Threads are disabled
-  (`variant/thread_support=false`, Godot 4.3+) so the build runs
-  without COOP/COEP (cross-origin isolation) headers.
+  (headless web export + desktop binaries in the `barichello/godot-ci`
+  image) → upload (scp to the droparea) → update (calls the
+  teletypegames `/update` endpoint with `platform=godot`).
+- `example-export_presets.cfg` — `export_presets.cfg` with the **Web**
+  preset the Makefile exports plus the desktop presets (**Windows
+  x86**, **Windows x64**, **Linux x64**, **Mac universal**). Web
+  threads are disabled (`variant/thread_support=false`, Godot 4.3+) so
+  the build runs without COOP/COEP (cross-origin isolation) headers.
 - `example-tasks.json` — VS Code `.vscode/tasks.json` with the common
   dev tasks: **Run** (`godot --path .`, default build task,
   `Cmd+Shift+B`), **Edit**, **Export Web** and **Make build**.
@@ -25,8 +28,18 @@ and [tic80-tools](../tic80-tools).
 1. Copy `example-makefile.make` to `Makefile` and set `PROJECT`
    (the web build is packaged as `$(PROJECT)-$(VERSION).html.zip`).
 2. Copy `example-export_presets.cfg` to `export_presets.cfg` (or merge
-   the `Web` preset into your existing presets). Keep the preset name
-   in sync with `EXPORT_PRESET` in the Makefile.
+   the presets into your existing file). Keep the preset names in sync
+   with the Makefile (`EXPORT_PRESET` for web, the `B_PRESET` values of
+   the `binary-*` targets for desktop), and set
+   `application/bundle_identifier` in the Mac preset to your project.
+   For the universal mac export enable ETC2 ASTC texture import in
+   `project.godot`:
+
+   ```ini
+   [rendering]
+
+   textures/vram_compression/import_etc2_astc=true
+   ```
 3. Copy `example-woodpecker.yaml` to `.woodpecker.yaml` and add the
    `droparea_ssh_password` / `update_secret_key` secrets in Woodpecker.
    Match the `godot-builder` image tag to the Godot version the
@@ -34,9 +47,15 @@ and [tic80-tools](../tic80-tools).
    `barichello/godot-ci` image ships the matching export templates.
 4. Copy `example-tasks.json` to `.vscode/tasks.json`.
 
-The pipeline uploads `$(PROJECT)-$(VERSION).html.zip` to the droparea,
-then triggers
-`/update?platform=godot&name=$(PROJECT)&version=$(VERSION)`.
+The pipeline uploads `$(PROJECT)-$(VERSION).html.zip` and the desktop
+binary zips (`$(PROJECT)-$(VERSION)-<target>.zip`, targets: `win-x86`,
+`win-x64`, `linux-x64`, `mac-universal`) to the droparea, then triggers
+`/update?platform=godot&name=$(PROJECT)&version=$(VERSION)`, which
+attaches them to the release as ReleaseAssets. Godot cross-exports all
+desktop platforms from the linux CI image with the official export
+templates; mac is a single universal (intel + arm) build with Godot's
+built-in ad-hoc codesign — per-arch mac export would need custom-built
+templates.
 
 ## Builder image