Tests against a fake Frame, and a headset smoke test

tests/fakeframe: a container that stands in for the Frame (Arch Linux, or
Arch Linux ARM on arm64) with sshd, rsync, Valve's steamos-devkit-service
and hooks (vendored unmodified), a fake Steam client for the devkit pipe and
the DevTools port (the app's JavaScript runs in Node against stand-in
SteamClient/appStore objects), stubs for steam, wpctl, flatpak, podman,
Lepton and friends, battery and thermal files under /sys, and fault
switches (fakeframe-ctl): pairing mode, approve/deny/timeout, Steam not
running, headset asleep, sshd off, disk full, runtimes missing. A second
container is the computer running Frame Control.

tests/e2e: 29 tests driving the real ui/server.py, frame_connect.py and
frame_titles.py against it; skipped unless FRAME_E2E=1. scripts/e2e.sh
builds, runs and tears down; CI runs it on ubuntu-24.04-arm.

tests/smoke + scripts/frame-smoke.sh: the core cases against a real Frame,
recorded with its BUILD_ID, cleaning up after itself; --pair to pair a
throwaway key. docs/testing.md describes the layers.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

.github/workflows/checks.yml

@@ -71,3 +71,15 @@ jobs:
           cd ios
           udid=$(xcrun simctl list devices available -j | python3 -c 'import json,sys; d=json.load(sys.stdin)["devices"]; print(next(x["udid"] for r in d for x in d[r] if x["name"].startswith("iPhone")))')
           xcodebuild -project FrameControl.xcodeproj -scheme FrameControl -destination "platform=iOS Simulator,id=$udid" CODE_SIGNING_ALLOWED=NO test
+
+  # End-to-end tests against the fake Frame (tests/fakeframe): Arch Linux ARM
+  # in Docker, on a native arm64 runner like the headset. See docs/testing.md.
+  e2e:
+    runs-on: ubuntu-24.04-arm
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install zsh
+        run: sudo apt-get update -qq && sudo apt-get install -y -qq zsh
+      - name: End-to-end tests
+        run: scripts/e2e.sh