test: bundled-mode supervisor integration test (faked AppImage layout)

Stages a fake AppImage layout in /tmp without a real .AppImage build:
  $ROOT/usr/bin/<app>           — copy of the host binary
  $ROOT/usr/bin/frankenphp      — symlink to system frankenphp
  $ROOT/usr/share/<app>/symfony — staged --no-dev composer copy
  $ROOT/usr/share/<app>/Caddyfile

The staged Symfony tree is `chmod -R a-w` to actually exercise the
read-only-mount cache/log redirect (Kernel::getCacheDir +
APP_CACHE_DIR override) — without the override, Symfony would fail
to mkdir var/cache/prod and migrations would error out.

Then runs the host with BRIDGE_URL unset (forces bundled mode), polls
/healthz, and asserts:

  - status=ok + bundle="PhpQml\Bridge\Publisher" — proves the
    HealthController deep-load (predecessor commit) actually
    autowired Publisher, i.e. BridgeBundle is reachable.
  - User data dir's var/cache exists — APP_CACHE_DIR override fired.
  - Staged tree's var/cache/prod is empty — Symfony didn't write into
    the read-only mount.

Together this catches every v0.1.0 shakedown bug in CI:
  - doubled bin/frankenphp path (resolveFrankenphpBin)
  - composer path-repo symlink dangling (staging-symfony's symlink:false sed)
  - read-only mount cache failure (Kernel + supervisor env-vars)
  - bundle autoload broken (HealthController canary)

Implementation gotcha (caught during dev): the host binary must be
COPIED into the staged layout, not symlinked. Qt's
applicationDirPath() reads /proc/self/exe which dereferences
symlinks, so a symlinked host would resolve to the original build/
dir and the supervisor would hunt for frankenphp + symfony there
instead of the staged tree. Real AppImages copy the binary, mimicking
that here.

Wiring:

  - examples/todo/Makefile: extracted the staging-symfony logic out
    of the appimage target into its own staging-symfony target. New
    integration-bundled target depends on `build` + `staging-symfony`
    and runs tests/bundled-supervisor.sh. quality target now invokes
    integration-bundled after the existing dev-mode integration test.
  - .gitea/workflows/ci.yml: new "Bundled-mode supervisor integration
    test" step right after the dev-mode integration step.

Closes the v0.1.1 follow-up "Bundled-mode integration test" tracked
in PLAN.md §13.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -95,3 +95,7 @@ jobs:
       - name: Bridge-integration test (HTTP/SSE round-trip + crash-recover)
         working-directory: examples/todo
         run: ./tests/integration.sh
+
+      - name: Bundled-mode supervisor integration test
+        working-directory: examples/todo
+        run: make integration-bundled