ci(engine): drop bump-lobby job; lobby fetches the engine at runtime

bar-lobby and the Chobby launcher now download the engine release directly
at first run, so the engine no longer pushes a pin file into bar-lobby.

Author: Mearman

.github/workflows/macos-build-gpu.yml

@@ -376,35 +376,5 @@ jobs:
               --repo "$GITHUB_REPOSITORY" --target "$GITHUB_SHA" \
               --title "$TITLE" --notes "$NOTES" --latest
           fi
-
-  # Propagate the engine to the lobby. A deploy key is git/SSH-only (it cannot
-  # call the API for repository_dispatch), so instead we push the new engine tag
-  # into a tracked file in ExaDev/bar-lobby. bar-lobby's release.yml triggers on
-  # push to macos-port and reads that file, so this both pins the lobby to an
-  # explicit engine version (reproducible — no "latest" race) and kicks a lobby
-  # rebuild. A deploy-key push (unlike a GITHUB_TOKEN push) does spawn the
-  # downstream workflow run.
-  bump-lobby:
-    name: Pin engine in bar-lobby
-    needs: build-macos-gpu
-    if: github.event_name == 'push' && needs.build-macos-gpu.outputs.engine_tag != ''
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout bar-lobby via SSH deploy key
-        uses: actions/checkout@v6
-        with:
-          repository: ExaDev/bar-lobby
-          ref: macos-port
-          ssh-key: ${{ secrets.LOBBY_DEPLOY_KEY }}
-      - name: Write pinned engine tag and push
-        env:
-          ENGINE_TAG: ${{ needs.build-macos-gpu.outputs.engine_tag }}
-        run: |
-          set -euo pipefail
-          mkdir -p buildResources
-          printf '%s\n' "$ENGINE_TAG" > buildResources/engine-release.txt
-          git config user.name "github-actions[bot]"
-          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
-          git add buildResources/engine-release.txt
-          git diff --cached --quiet || git commit -m "chore: pin engine ${ENGINE_TAG}"
-          git push
+          # bar-lobby and the Chobby launcher now fetch this engine release
+          # directly at runtime (no pin file), so there is no downstream bump job.