Run the gate, the editor suite and the three games on the Gitea runner

The job image (tools/ci/Dockerfile, label game-maker-ci) carries chromium with the Vulkan
drivers, php-cli and the host's fonts; the render device itself comes from the runner's
container.options, so a job container gets the Intel GPU instead of llvmpipe.

tools/ci/serve.sh puts the checkout behind /game-maker/ with php -S and writes the project
shells the seeders need; every tool now takes its server from GAME_MAKER_BASE_URL rather than
from a project id repeated in shell scripts.

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

tools/ci/run-e2e.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+# The editor suite in CI: serve the checkout, seed the fixture, run every step.
+# Ends in a line that survives a pipe, like check.sh does.
+set -euo pipefail
+
+cd "$(dirname "$(readlink -f "$0")")/../.."
+source tools/ci/serve.sh
+game_maker_serve
+
+set +e
+node tools/seed-e2e.mjs && node tools/e2e.mjs
+code=$?
+echo "=== E2E EXIT $code ==="
+exit $code